1 /*
2 * Copyright (c) 2003, 2021, Oracle and/or its affiliates. All rights reserved.
3 * Copyright (c) 2017, 2020 SAP SE. All rights reserved.
4 * Copyright (c) 2023, Red Hat, Inc. and/or its affiliates.
5 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
6 *
7 * This code is free software; you can redistribute it and/or modify it
8 * under the terms of the GNU General Public License version 2 only, as
9 * published by the Free Software Foundation.
10 *
11 * This code is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14 * version 2 for more details (a copy is included in the LICENSE file that
15 * accompanied this code).
16 *
17 * You should have received a copy of the GNU General Public License version
18 * 2 along with this work; if not, write to the Free Software Foundation,
19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20 *
21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22 * or visit www.oracle.com if you need additional information or have any
23 * questions.
24 *
25 */
26
27 #include "precompiled.hpp"
28 #include "jvm.h"
29 #include "cds/metaspaceShared.hpp"
30 #include "code/codeCache.hpp"
31 #include "compiler/compileBroker.hpp"
32 #include "compiler/disassembler.hpp"
33 #include "gc/shared/gcConfig.hpp"
34 #include "gc/shared/gcLogPrecious.hpp"
35 #include "logging/logConfiguration.hpp"
36 #include "memory/metaspace.hpp"
37 #include "memory/metaspaceUtils.hpp"
38 #include "memory/resourceArea.inline.hpp"
39 #include "memory/universe.hpp"
40 #include "oops/compressedOops.hpp"
41 #include "prims/whitebox.hpp"
42 #include "runtime/arguments.hpp"
43 #include "runtime/atomic.hpp"
44 #include "runtime/frame.inline.hpp"
45 #include "runtime/init.hpp"
46 #include "runtime/os.hpp"
47 #include "runtime/osThread.hpp"
48 #include "runtime/safefetch.hpp"
49 #include "runtime/safepointMechanism.hpp"
50 #include "runtime/stackFrameStream.inline.hpp"
51 #include "runtime/thread.inline.hpp"
52 #include "runtime/threadSMR.hpp"
53 #include "runtime/trimNativeHeap.hpp"
54 #include "runtime/vmThread.hpp"
55 #include "runtime/vmOperations.hpp"
56 #include "runtime/vm_version.hpp"
57 #include "runtime/flags/jvmFlag.hpp"
58 #include "services/memTracker.hpp"
59 #include "utilities/debug.hpp"
60 #include "utilities/decoder.hpp"
61 #include "utilities/defaultStream.hpp"
62 #include "utilities/events.hpp"
63 #include "utilities/vmError.hpp"
64 #include "utilities/macros.hpp"
65 #if INCLUDE_JFR
66 #include "jfr/jfr.hpp"
67 #endif
68
69 #ifndef PRODUCT
70 #include <signal.h>
71 #endif // PRODUCT
72
73 bool VMError::coredump_status;
74 char VMError::coredump_message[O_BUFLEN];
75 int VMError::_current_step;
76 const char* VMError::_current_step_info;
77 volatile jlong VMError::_reporting_start_time = -1;
78 volatile bool VMError::_reporting_did_timeout = false;
79 volatile jlong VMError::_step_start_time = -1;
80 volatile bool VMError::_step_did_timeout = false;
81 volatile intptr_t VMError::_first_error_tid = -1;
82 int VMError::_id;
83 const char* VMError::_message;
84 char VMError::_detail_msg[1024];
85 Thread* VMError::_thread;
86 address VMError::_pc;
87 void* VMError::_siginfo;
88 void* VMError::_context;
89 bool VMError::_print_native_stack_used = false;
90 const char* VMError::_filename;
91 int VMError::_lineno;
92 size_t VMError::_size;
93
94 // List of environment variables that should be reported in error log file.
95 static const char* env_list[] = {
96 // All platforms
97 "JAVA_HOME", "JAVA_TOOL_OPTIONS", "_JAVA_OPTIONS", "CLASSPATH",
98 "PATH", "USERNAME",
99
100 "XDG_CACHE_HOME", "XDG_CONFIG_HOME", "FC_LANG", "FONTCONFIG_USE_MMAP",
101
102 // Env variables that are defined on Linux/BSD
103 "LD_LIBRARY_PATH", "LD_PRELOAD", "SHELL", "DISPLAY",
104 "HOSTTYPE", "OSTYPE", "ARCH", "MACHTYPE",
105 "LANG", "LC_ALL", "LC_CTYPE", "LC_NUMERIC", "LC_TIME",
106 "TERM", "TMPDIR", "TZ",
107
108 // defined on AIX
109 "LIBPATH", "LDR_PRELOAD", "LDR_PRELOAD64",
110
111 // defined on Linux/AIX/BSD
112 "_JAVA_SR_SIGNUM",
113
114 // defined on Darwin
115 "DYLD_LIBRARY_PATH", "DYLD_FALLBACK_LIBRARY_PATH",
116 "DYLD_FRAMEWORK_PATH", "DYLD_FALLBACK_FRAMEWORK_PATH",
117 "DYLD_INSERT_LIBRARIES",
118
119 // defined on Windows
120 "OS", "PROCESSOR_IDENTIFIER", "_ALT_JAVA_HOME_DIR", "TMP", "TEMP",
121
122 (const char *)0
123 };
124
125 // A simple parser for -XX:OnError, usage:
126 // ptr = OnError;
127 // while ((cmd = next_OnError_command(buffer, sizeof(buffer), &ptr) != NULL)
128 // ... ...
129 static char* next_OnError_command(char* buf, int buflen, const char** ptr) {
130 if (ptr == NULL || *ptr == NULL) return NULL;
131
132 const char* cmd = *ptr;
133
134 // skip leading blanks or ';'
135 while (*cmd == ' ' || *cmd == ';') cmd++;
136
137 if (*cmd == '\0') return NULL;
138
139 const char * cmdend = cmd;
140 while (*cmdend != '\0' && *cmdend != ';') cmdend++;
141
142 Arguments::copy_expand_pid(cmd, cmdend - cmd, buf, buflen);
143
144 *ptr = (*cmdend == '\0' ? cmdend : cmdend + 1);
145 return buf;
146 }
147
148 static void print_bug_submit_message(outputStream *out, Thread *thread) {
149 if (out == NULL) return;
150 const char *url = Arguments::java_vendor_url_bug();
151 if (url == NULL || *url == '\0')
152 url = JDK_Version::runtime_vendor_vm_bug_url();
153 if (url != NULL && *url != '\0') {
154 out->print_raw_cr("# If you would like to submit a bug report, please visit:");
155 out->print_raw ("# ");
156 out->print_raw_cr(url);
157 }
158 // If the crash is in native code, encourage user to submit a bug to the
159 // provider of that code.
160 if (thread && thread->is_Java_thread() &&
161 !thread->is_hidden_from_external_view()) {
162 if (thread->as_Java_thread()->thread_state() == _thread_in_native) {
163 out->print_cr("# The crash happened outside the Java Virtual Machine in native code.\n# See problematic frame for where to report the bug.");
164 }
165 }
166 out->print_raw_cr("#");
167 }
168
169 void VMError::record_coredump_status(const char* message, bool status) {
170 coredump_status = status;
171 strncpy(coredump_message, message, sizeof(coredump_message));
172 coredump_message[sizeof(coredump_message)-1] = 0;
173 }
174
175 // Return a string to describe the error
176 char* VMError::error_string(char* buf, int buflen) {
177 char signame_buf[64];
178 const char *signame = os::exception_name(_id, signame_buf, sizeof(signame_buf));
179
180 if (signame) {
181 jio_snprintf(buf, buflen,
182 "%s (0x%x) at pc=" PTR_FORMAT ", pid=%d, tid=" UINTX_FORMAT,
183 signame, _id, _pc,
184 os::current_process_id(), os::current_thread_id());
185 } else if (_filename != NULL && _lineno > 0) {
186 // skip directory names
187 char separator = os::file_separator()[0];
188 const char *p = strrchr(_filename, separator);
189 int n = jio_snprintf(buf, buflen,
190 "Internal Error at %s:%d, pid=%d, tid=" UINTX_FORMAT,
191 p ? p + 1 : _filename, _lineno,
192 os::current_process_id(), os::current_thread_id());
193 if (n >= 0 && n < buflen && _message) {
194 if (strlen(_detail_msg) > 0) {
195 jio_snprintf(buf + n, buflen - n, "%s%s: %s",
196 os::line_separator(), _message, _detail_msg);
197 } else {
198 jio_snprintf(buf + n, buflen - n, "%sError: %s",
199 os::line_separator(), _message);
200 }
201 }
202 } else {
203 jio_snprintf(buf, buflen,
204 "Internal Error (0x%x), pid=%d, tid=" UINTX_FORMAT,
205 _id, os::current_process_id(), os::current_thread_id());
206 }
207
208 return buf;
209 }
210
211 void VMError::print_stack_trace(outputStream* st, JavaThread* jt,
212 char* buf, int buflen, bool verbose) {
213 #ifdef ZERO
214 if (jt->zero_stack()->sp() && jt->top_zero_frame()) {
215 // StackFrameStream uses the frame anchor, which may not have
216 // been set up. This can be done at any time in Zero, however,
217 // so if it hasn't been set up then we just set it up now and
218 // clear it again when we're done.
219 bool has_last_Java_frame = jt->has_last_Java_frame();
220 if (!has_last_Java_frame)
221 jt->set_last_Java_frame();
222 st->print("Java frames:");
223 st->cr();
224
225 // Print the frames
226 StackFrameStream sfs(jt, true /* update */, true /* process_frames */);
227 for(int i = 0; !sfs.is_done(); sfs.next(), i++) {
228 sfs.current()->zero_print_on_error(i, st, buf, buflen);
229 st->cr();
230 }
231
232 // Reset the frame anchor if necessary
233 if (!has_last_Java_frame)
234 jt->reset_last_Java_frame();
235 }
236 #else
237 if (jt->has_last_Java_frame()) {
238 st->print_cr("Java frames: (J=compiled Java code, j=interpreted, Vv=VM code)");
239 for (StackFrameStream sfs(jt, true /* update */, true /* process_frames */); !sfs.is_done(); sfs.next()) {
240 sfs.current()->print_on_error(st, buf, buflen, verbose);
241 st->cr();
242 }
243 }
244 #endif // ZERO
245 }
246
247 /**
248 * Adds `value` to `list` iff it's not already present and there is sufficient
249 * capacity (i.e. length(list) < `list_capacity`). The length of the list
250 * is the index of the first nullptr entry or `list_capacity` if there are
251 * no nullptr entries.
252 *
253 * @ return true if the value was added, false otherwise
254 */
255 static bool add_if_absent(address value, address* list, int list_capacity) {
256 for (int i = 0; i < list_capacity; i++) {
257 if (list[i] == value) {
258 return false;
259 }
260 if (list[i] == nullptr) {
261 list[i] = value;
262 if (i + 1 < list_capacity) {
263 list[i + 1] = nullptr;
264 }
265 return true;
266 }
267 }
268 return false;
269 }
270
271 /**
272 * Prints the VM generated code unit, if any, containing `pc` if it has not already
273 * been printed. If the code unit is an InterpreterCodelet or StubCodeDesc, it is
274 * only printed if `is_crash_pc` is true.
275 *
276 * @param printed array of code units that have already been printed (delimited by NULL entry)
277 * @param printed_capacity the capacity of `printed`
278 * @return true if the code unit was printed, false otherwise
279 */
280 static bool print_code(outputStream* st, Thread* thread, address pc, bool is_crash_pc,
281 address* printed, int printed_capacity) {
282 if (Interpreter::contains(pc)) {
283 if (is_crash_pc) {
284 // The interpreter CodeBlob is very large so try to print the codelet instead.
285 InterpreterCodelet* codelet = Interpreter::codelet_containing(pc);
286 if (codelet != nullptr) {
287 if (add_if_absent((address) codelet, printed, printed_capacity)) {
288 codelet->print_on(st);
289 Disassembler::decode(codelet->code_begin(), codelet->code_end(), st);
290 return true;
291 }
292 }
293 }
294 } else {
295 StubCodeDesc* desc = StubCodeDesc::desc_for(pc);
296 if (desc != nullptr) {
297 if (is_crash_pc) {
298 if (add_if_absent((address) desc, printed, printed_capacity)) {
299 desc->print_on(st);
300 Disassembler::decode(desc->begin(), desc->end(), st);
301 return true;
302 }
303 }
304 } else if (thread != nullptr) {
305 CodeBlob* cb = CodeCache::find_blob(pc);
306 if (cb != nullptr && add_if_absent((address) cb, printed, printed_capacity)) {
307 // Disassembling nmethod will incur resource memory allocation,
308 // only do so when thread is valid.
309 ResourceMark rm(thread);
310 Disassembler::decode(cb, st);
311 st->cr();
312 return true;
313 }
314 }
315 }
316 return false;
317 }
318
319 // Like above, but only try to figure out a short name. Return nullptr if not found.
320 static const char* find_code_name(address pc) {
321 if (Interpreter::contains(pc)) {
322 InterpreterCodelet* codelet = Interpreter::codelet_containing(pc);
323 if (codelet != nullptr) {
324 return codelet->description();
325 }
326 } else {
327 StubCodeDesc* desc = StubCodeDesc::desc_for(pc);
328 if (desc != nullptr) {
329 return desc->name();
330 } else {
331 CodeBlob* cb = CodeCache::find_blob(pc);
332 if (cb != nullptr) {
333 return cb->name();
334 }
335 }
336 }
337 return nullptr;
338 }
339
340 /**
341 * Gets the caller frame of `fr`.
342 *
343 * @returns an invalid frame (i.e. fr.pc() === 0) if the caller cannot be obtained
344 */
345 static frame next_frame(frame fr, Thread* t) {
346 // Compiled code may use EBP register on x86 so it looks like
347 // non-walkable C frame. Use frame.sender() for java frames.
348 frame invalid;
349 if (t != nullptr && t->is_Java_thread()) {
350 // Catch very first native frame by using stack address.
351 // For JavaThread stack_base and stack_size should be set.
352 if (!t->is_in_full_stack((address)(fr.real_fp() + 1))) {
353 return invalid;
354 }
355 if (fr.is_java_frame() || fr.is_native_frame() || fr.is_runtime_frame()) {
356 RegisterMap map(t->as_Java_thread(), false); // No update
357 return fr.sender(&map);
358 } else {
359 // is_first_C_frame() does only simple checks for frame pointer,
360 // it will pass if java compiled code has a pointer in EBP.
361 if (os::is_first_C_frame(&fr)) return invalid;
362 return os::get_sender_for_C_frame(&fr);
363 }
364 } else {
365 if (os::is_first_C_frame(&fr)) return invalid;
366 return os::get_sender_for_C_frame(&fr);
367 }
368 }
369
370 void VMError::print_native_stack(outputStream* st, frame fr, Thread* t, char* buf, int buf_size) {
371
372 // see if it's a valid frame
373 if (fr.pc()) {
374 st->print_cr("Native frames: (J=compiled Java code, j=interpreted, Vv=VM code, C=native code)");
375
376 int count = 0;
377 while (count++ < StackPrintLimit) {
378 fr.print_on_error(st, buf, buf_size);
379 if (fr.pc()) { // print source file and line, if available
380 char buf[128];
381 int line_no;
382 if (Decoder::get_source_info(fr.pc(), buf, sizeof(buf), &line_no)) {
383 st->print(" (%s:%d)", buf, line_no);
384 }
385 }
386 st->cr();
387 fr = next_frame(fr, t);
388 if (fr.pc() == nullptr) {
389 break;
390 }
391 }
392
393 if (count > StackPrintLimit) {
394 st->print_cr("...<more frames>...");
395 }
396
397 st->cr();
398 }
399 }
400
401 static void print_oom_reasons(outputStream* st) {
402 st->print_cr("# Possible reasons:");
403 st->print_cr("# The system is out of physical RAM or swap space");
404 if (UseCompressedOops) {
405 st->print_cr("# This process is running with CompressedOops enabled, and the Java Heap may be blocking the growth of the native heap");
406 }
407 if (LogBytesPerWord == 2) {
408 st->print_cr("# In 32 bit mode, the process size limit was hit");
409 }
410 st->print_cr("# Possible solutions:");
411 st->print_cr("# Reduce memory load on the system");
412 st->print_cr("# Increase physical memory or swap space");
413 st->print_cr("# Check if swap backing store is full");
414 if (LogBytesPerWord == 2) {
415 st->print_cr("# Use 64 bit Java on a 64 bit OS");
416 }
417 st->print_cr("# Decrease Java heap size (-Xmx/-Xms)");
418 st->print_cr("# Decrease number of Java threads");
419 st->print_cr("# Decrease Java thread stack sizes (-Xss)");
420 st->print_cr("# Set larger code cache with -XX:ReservedCodeCacheSize=");
421 if (UseCompressedOops) {
422 switch (CompressedOops::mode()) {
423 case CompressedOops::UnscaledNarrowOop:
424 st->print_cr("# JVM is running with Unscaled Compressed Oops mode in which the Java heap is");
425 st->print_cr("# placed in the first 4GB address space. The Java Heap base address is the");
426 st->print_cr("# maximum limit for the native heap growth. Please use -XX:HeapBaseMinAddress");
427 st->print_cr("# to set the Java Heap base and to place the Java Heap above 4GB virtual address.");
428 break;
429 case CompressedOops::ZeroBasedNarrowOop:
430 st->print_cr("# JVM is running with Zero Based Compressed Oops mode in which the Java heap is");
431 st->print_cr("# placed in the first 32GB address space. The Java Heap base address is the");
432 st->print_cr("# maximum limit for the native heap growth. Please use -XX:HeapBaseMinAddress");
433 st->print_cr("# to set the Java Heap base and to place the Java Heap above 32GB virtual address.");
434 break;
435 default:
436 break;
437 }
438 }
439 st->print_cr("# This output file may be truncated or incomplete.");
440 }
441
442 static void report_vm_version(outputStream* st, char* buf, int buflen) {
443 // VM version
444 st->print_cr("#");
445 JDK_Version::current().to_string(buf, buflen);
446 const char* runtime_name = JDK_Version::runtime_name() != NULL ?
447 JDK_Version::runtime_name() : "";
448 const char* runtime_version = JDK_Version::runtime_version() != NULL ?
449 JDK_Version::runtime_version() : "";
450 const char* vendor_version = JDK_Version::runtime_vendor_version() != NULL ?
451 JDK_Version::runtime_vendor_version() : "";
452 const char* jdk_debug_level = VM_Version::printable_jdk_debug_level() != NULL ?
453 VM_Version::printable_jdk_debug_level() : "";
454
455 st->print_cr("# JRE version: %s%s%s (%s) (%sbuild %s)", runtime_name,
456 (*vendor_version != '\0') ? " " : "", vendor_version,
457 buf, jdk_debug_level, runtime_version);
458
459 // This is the long version with some default settings added
460 st->print_cr("# Java VM: %s%s%s (%s%s, %s%s%s%s%s%s, %s, %s)",
461 VM_Version::vm_name(),
462 (*vendor_version != '\0') ? " " : "", vendor_version,
463 jdk_debug_level,
464 VM_Version::vm_release(),
465 VM_Version::vm_info_string(),
466 TieredCompilation ? ", tiered" : "",
467 #if INCLUDE_JVMCI
468 EnableJVMCI ? ", jvmci" : "",
469 UseJVMCICompiler ? ", jvmci compiler" : "",
470 #else
471 "", "",
472 #endif
473 UseCompressedOops ? ", compressed oops" : "",
474 UseCompressedClassPointers ? ", compressed class ptrs" : "",
475 GCConfig::hs_err_name(),
476 VM_Version::vm_platform_string()
477 );
478 }
479
480 // Returns true if at least one thread reported a fatal error and fatal error handling is in process.
481 bool VMError::is_error_reported() {
482 return _first_error_tid != -1;
483 }
484
485 // Returns true if the current thread reported a fatal error.
486 bool VMError::is_error_reported_in_current_thread() {
487 return _first_error_tid == os::current_thread_id();
488 }
489
490 // Helper, return current timestamp for timeout handling.
491 jlong VMError::get_current_timestamp() {
492 return os::javaTimeNanos();
493 }
494 // Factor to translate the timestamp to seconds.
495 #define TIMESTAMP_TO_SECONDS_FACTOR (1000 * 1000 * 1000)
496
497 void VMError::record_reporting_start_time() {
498 const jlong now = get_current_timestamp();
499 Atomic::store(&_reporting_start_time, now);
500 }
501
502 jlong VMError::get_reporting_start_time() {
503 return Atomic::load(&_reporting_start_time);
504 }
505
506 void VMError::record_step_start_time() {
507 const jlong now = get_current_timestamp();
508 Atomic::store(&_step_start_time, now);
509 }
510
511 jlong VMError::get_step_start_time() {
512 return Atomic::load(&_step_start_time);
513 }
514
515 void VMError::clear_step_start_time() {
516 return Atomic::store(&_step_start_time, (jlong)0);
517 }
518
519 // This is the main function to report a fatal error. Only one thread can
520 // call this function, so we don't need to worry about MT-safety. But it's
521 // possible that the error handler itself may crash or die on an internal
522 // error, for example, when the stack/heap is badly damaged. We must be
523 // able to handle recursive errors that happen inside error handler.
524 //
525 // Error reporting is done in several steps. If a crash or internal error
526 // occurred when reporting an error, the nested signal/exception handler
527 // can skip steps that are already (or partially) done. Error reporting will
528 // continue from the next step. This allows us to retrieve and print
529 // information that may be unsafe to get after a fatal error. If it happens,
530 // you may find nested report_and_die() frames when you look at the stack
531 // in a debugger.
532 //
533 // In general, a hang in error handler is much worse than a crash or internal
534 // error, as it's harder to recover from a hang. Deadlock can happen if we
535 // try to grab a lock that is already owned by current thread, or if the
536 // owner is blocked forever (e.g. in os::infinite_sleep()). If possible, the
537 // error handler and all the functions it called should avoid grabbing any
538 // lock. An important thing to notice is that memory allocation needs a lock.
539 //
540 // We should avoid using large stack allocated buffers. Many errors happen
541 // when stack space is already low. Making things even worse is that there
542 // could be nested report_and_die() calls on stack (see above). Only one
543 // thread can report error, so large buffers are statically allocated in data
544 // segment.
545 void VMError::report(outputStream* st, bool _verbose) {
546
547 # define BEGIN if (_current_step == 0) { _current_step = __LINE__;
548 # define STEP(s) } if (_current_step < __LINE__) { _current_step = __LINE__; _current_step_info = s; \
549 record_step_start_time(); _step_did_timeout = false;
550 # define END clear_step_start_time(); }
551
552 // don't allocate large buffer on stack
553 static char buf[O_BUFLEN];
554
555 // Native stack trace may get stuck. We try to handle the last pc if it
556 // belongs to VM generated code.
557 address lastpc = nullptr;
558
559 BEGIN
560
561 STEP("printing fatal error message")
562
563 st->print_cr("#");
564 if (should_report_bug(_id)) {
565 st->print_cr("# A fatal error has been detected by the Java Runtime Environment:");
566 } else {
567 st->print_cr("# There is insufficient memory for the Java "
568 "Runtime Environment to continue.");
569 }
570
571 #ifdef ASSERT
572 // Error handler self tests
573
574 // test secondary error handling. Test it twice, to test that resetting
575 // error handler after a secondary crash works.
576 STEP("test secondary crash 1")
577 if (_verbose && TestCrashInErrorHandler != 0) {
578 st->print_cr("Will crash now (TestCrashInErrorHandler=" UINTX_FORMAT ")...",
579 TestCrashInErrorHandler);
580 controlled_crash(TestCrashInErrorHandler);
581 }
582
583 STEP("test secondary crash 2")
584 if (_verbose && TestCrashInErrorHandler != 0) {
585 st->print_cr("Will crash now (TestCrashInErrorHandler=" UINTX_FORMAT ")...",
586 TestCrashInErrorHandler);
587 controlled_crash(TestCrashInErrorHandler);
588 }
589
590 // TestUnresponsiveErrorHandler: We want to test both step timeouts and global timeout.
591 // Step to global timeout ratio is 4:1, so in order to be absolutely sure we hit the
592 // global timeout, let's execute the timeout step five times.
593 // See corresponding test in test/runtime/ErrorHandling/TimeoutInErrorHandlingTest.java
594 STEP("setup for test unresponsive error reporting step")
595 if (_verbose && TestUnresponsiveErrorHandler) {
596 // We record reporting_start_time for this test here because we
597 // care about the time spent executing TIMEOUT_TEST_STEP and not
598 // about the time it took us to get here.
599 tty->print_cr("Recording reporting_start_time for TestUnresponsiveErrorHandler.");
600 record_reporting_start_time();
601 }
602
603 #define TIMEOUT_TEST_STEP STEP("test unresponsive error reporting step") \
604 if (_verbose && TestUnresponsiveErrorHandler) { os::infinite_sleep(); }
605 TIMEOUT_TEST_STEP
606 TIMEOUT_TEST_STEP
607 TIMEOUT_TEST_STEP
608 TIMEOUT_TEST_STEP
609 TIMEOUT_TEST_STEP
610
611 STEP("test safefetch in error handler")
612 // test whether it is safe to use SafeFetch32 in Crash Handler. Test twice
613 // to test that resetting the signal handler works correctly.
614 if (_verbose && TestSafeFetchInErrorHandler) {
615 st->print_cr("Will test SafeFetch...");
616 int* const invalid_pointer = (int*)segfault_address;
617 const int x = 0x76543210;
618 int i1 = SafeFetch32(invalid_pointer, x);
619 int i2 = SafeFetch32(invalid_pointer, x);
620 if (i1 == x && i2 == x) {
621 st->print_cr("SafeFetch OK."); // Correctly deflected and returned default pattern
622 } else {
623 st->print_cr("??");
624 }
625 }
626 #endif // ASSERT
627
628 STEP("printing type of error")
629
630 switch(static_cast<unsigned int>(_id)) {
631 case OOM_MALLOC_ERROR:
632 case OOM_MMAP_ERROR:
633 case OOM_MPROTECT_ERROR:
634 if (_size) {
635 st->print("# Native memory allocation ");
636 st->print((_id == (int)OOM_MALLOC_ERROR) ? "(malloc) failed to allocate " :
637 (_id == (int)OOM_MMAP_ERROR) ? "(mmap) failed to map " :
638 "(mprotect) failed to protect ");
639 jio_snprintf(buf, sizeof(buf), SIZE_FORMAT, _size);
640 st->print("%s", buf);
641 st->print(" bytes.");
642 if (strlen(_detail_msg) > 0) {
643 st->print(" Error detail: ");
644 st->print("%s", _detail_msg);
645 }
646 st->cr();
647 } else {
648 if (strlen(_detail_msg) > 0) {
649 st->print("# ");
650 st->print_cr("%s", _detail_msg);
651 }
652 }
653 // In error file give some solutions
654 if (_verbose) {
655 print_oom_reasons(st);
656 } else {
657 return; // that's enough for the screen
658 }
659 break;
660 case INTERNAL_ERROR:
661 default:
662 break;
663 }
664
665 STEP("printing exception/signal name")
666
667 st->print_cr("#");
668 st->print("# ");
669 // Is it an OS exception/signal?
670 if (os::exception_name(_id, buf, sizeof(buf))) {
671 st->print("%s", buf);
672 st->print(" (0x%x)", _id); // signal number
673 st->print(" at pc=" PTR_FORMAT, p2i(_pc));
674 if (_siginfo != NULL && os::signal_sent_by_kill(_siginfo)) {
675 st->print(" (sent by kill)");
676 }
677 } else {
678 if (should_report_bug(_id)) {
679 st->print("Internal Error");
680 } else {
681 st->print("Out of Memory Error");
682 }
683 if (_filename != NULL && _lineno > 0) {
684 #ifdef PRODUCT
685 // In product mode chop off pathname?
686 char separator = os::file_separator()[0];
687 const char *p = strrchr(_filename, separator);
688 const char *file = p ? p+1 : _filename;
689 #else
690 const char *file = _filename;
691 #endif
692 st->print(" (%s:%d)", file, _lineno);
693 } else {
694 st->print(" (0x%x)", _id);
695 }
696 }
697
698 STEP("printing current thread and pid")
699
700 // process id, thread id
701 st->print(", pid=%d", os::current_process_id());
702 st->print(", tid=" UINTX_FORMAT, os::current_thread_id());
703 st->cr();
704
705 STEP("printing error message")
706
707 if (should_report_bug(_id)) { // already printed the message.
708 // error message
709 if (strlen(_detail_msg) > 0) {
710 st->print_cr("# %s: %s", _message ? _message : "Error", _detail_msg);
711 } else if (_message) {
712 st->print_cr("# Error: %s", _message);
713 }
714 }
715
716 STEP("printing Java version string")
717
718 report_vm_version(st, buf, sizeof(buf));
719
720 STEP("printing problematic frame")
721
722 // Print current frame if we have a context (i.e. it's a crash)
723 if (_context) {
724 st->print_cr("# Problematic frame:");
725 st->print("# ");
726 frame fr = os::fetch_frame_from_context(_context);
727 fr.print_on_error(st, buf, sizeof(buf));
728 st->cr();
729 st->print_cr("#");
730 }
731
732 STEP("printing core file information")
733 st->print("# ");
734 if (CreateCoredumpOnCrash) {
735 if (coredump_status) {
736 st->print("Core dump will be written. Default location: %s", coredump_message);
737 } else {
738 st->print("No core dump will be written. %s", coredump_message);
739 }
740 } else {
741 st->print("CreateCoredumpOnCrash turned off, no core file dumped");
742 }
743 st->cr();
744 st->print_cr("#");
745
746 JFR_ONLY(STEP("printing jfr information"))
747 JFR_ONLY(Jfr::on_vm_error_report(st);)
748
749 STEP("printing bug submit message")
750
751 if (should_submit_bug_report(_id) && _verbose) {
752 print_bug_submit_message(st, _thread);
753 }
754
755 STEP("printing summary")
756
757 if (_verbose) {
758 st->cr();
759 st->print_cr("--------------- S U M M A R Y ------------");
760 st->cr();
761 }
762
763 STEP("printing VM option summary")
764
765 if (_verbose) {
766 // VM options
767 Arguments::print_summary_on(st);
768 st->cr();
769 }
770
771 STEP("printing summary machine and OS info")
772
773 if (_verbose) {
774 os::print_summary_info(st, buf, sizeof(buf));
775 }
776
777 STEP("printing date and time")
778
779 if (_verbose) {
780 os::print_date_and_time(st, buf, sizeof(buf));
781 }
782
783 STEP("printing thread")
784
785 if (_verbose) {
786 st->cr();
787 st->print_cr("--------------- T H R E A D ---------------");
788 st->cr();
789 }
790
791 STEP("printing current thread")
792
793 // current thread
794 if (_verbose) {
795 if (_thread) {
796 st->print("Current thread (" PTR_FORMAT "): ", p2i(_thread));
797 _thread->print_on_error(st, buf, sizeof(buf));
798 st->cr();
799 } else {
800 st->print_cr("Current thread is native thread");
801 }
802 st->cr();
803 }
804
805 STEP("printing current compile task")
806
807 if (_verbose && _thread && _thread->is_Compiler_thread()) {
808 CompilerThread* t = (CompilerThread*)_thread;
809 if (t->task()) {
810 st->cr();
811 st->print_cr("Current CompileTask:");
812 t->task()->print_line_on_error(st, buf, sizeof(buf));
813 st->cr();
814 }
815 }
816
817 STEP("printing stack bounds")
818
819 if (_verbose) {
820 st->print("Stack: ");
821
822 address stack_top;
823 size_t stack_size;
824
825 if (_thread) {
826 stack_top = _thread->stack_base();
827 stack_size = _thread->stack_size();
828 } else {
829 stack_top = os::current_stack_base();
830 stack_size = os::current_stack_size();
831 }
832
833 address stack_bottom = stack_top - stack_size;
834 st->print("[" PTR_FORMAT "," PTR_FORMAT "]", p2i(stack_bottom), p2i(stack_top));
835
836 frame fr = _context ? os::fetch_frame_from_context(_context)
837 : os::current_frame();
838
839 if (fr.sp()) {
840 st->print(", sp=" PTR_FORMAT, p2i(fr.sp()));
841 size_t free_stack_size = pointer_delta(fr.sp(), stack_bottom, 1024);
842 st->print(", free space=" SIZE_FORMAT "k", free_stack_size);
843 }
844
845 st->cr();
846 }
847
848 STEP("printing native stack")
849
850 if (_verbose) {
851 if (os::platform_print_native_stack(st, _context, buf, sizeof(buf), lastpc)) {
852 // We have printed the native stack in platform-specific code
853 // Windows/x64 needs special handling.
854 // Stack walking may get stuck. Try to find the calling code.
855 if (lastpc != nullptr) {
856 const char* name = find_code_name(lastpc);
857 if (name != nullptr) {
858 st->print_cr("The last pc belongs to %s (printed below).", name);
859 }
860 }
861 } else {
862 frame fr = _context ? os::fetch_frame_from_context(_context)
863 : os::current_frame();
864
865 print_native_stack(st, fr, _thread, buf, sizeof(buf));
866 _print_native_stack_used = true;
867 }
868 }
869
870 STEP("printing Java stack")
871
872 if (_verbose && _thread && _thread->is_Java_thread()) {
873 print_stack_trace(st, _thread->as_Java_thread(), buf, sizeof(buf));
874 }
875
876 STEP("printing target Java thread stack")
877
878 // printing Java thread stack trace if it is involved in GC crash
879 if (_verbose && _thread && (_thread->is_Named_thread())) {
880 Thread* thread = ((NamedThread *)_thread)->processed_thread();
881 if (thread != NULL && thread->is_Java_thread()) {
882 JavaThread* jt = thread->as_Java_thread();
883 st->print_cr("JavaThread " PTR_FORMAT " (nid = %d) was being processed", p2i(jt), jt->osthread()->thread_id());
884 print_stack_trace(st, jt, buf, sizeof(buf), true);
885 }
886 }
887
888 STEP("printing siginfo")
889
890 // signal no, signal code, address that caused the fault
891 if (_verbose && _siginfo) {
892 st->cr();
893 os::print_siginfo(st, _siginfo);
894 st->cr();
895 }
896
897 STEP("CDS archive access warning")
898
899 // Print an explicit hint if we crashed on access to the CDS archive.
900 if (_verbose && _siginfo) {
901 check_failing_cds_access(st, _siginfo);
902 st->cr();
903 }
904
905 STEP("printing registers")
906
907 // printing registers
908 if (_verbose && _context) {
909 os::print_context(st, _context);
910 st->cr();
911 }
912
913 STEP("printing register info")
914
915 // decode register contents if possible
916 if (_verbose && _context && _thread && Universe::is_fully_initialized()) {
917 ResourceMark rm(_thread);
918 os::print_register_info(st, _context);
919 st->cr();
920 }
921
922 STEP("printing top of stack, instructions near pc")
923
924 // printing top of stack, instructions near pc
925 if (_verbose && _context) {
926 os::print_tos_pc(st, _context);
927 st->cr();
928 }
929
930 STEP("inspecting top of stack")
931
932 // decode stack contents if possible
933 if (_verbose && _context && _thread && Universe::is_fully_initialized()) {
934 frame fr = os::fetch_frame_from_context(_context);
935 const int slots = 8;
936 const intptr_t *start = fr.sp();
937 const intptr_t *end = start + slots;
938 if (is_aligned(start, sizeof(intptr_t)) && os::is_readable_range(start, end)) {
939 st->print_cr("Stack slot to memory mapping:");
940 for (int i = 0; i < slots; ++i) {
941 st->print("stack at sp + %d slots: ", i);
942 ResourceMark rm(_thread);
943 os::print_location(st, *(start + i));
944 }
945 }
946 st->cr();
947 }
948
949 STEP("printing lock stack")
950
951 if (_verbose && _thread != nullptr && _thread->is_Java_thread() && LockingMode == LM_LIGHTWEIGHT) {
952 st->print_cr("Lock stack of current Java thread (top to bottom):");
953 _thread->as_Java_thread()->lock_stack().print_on(st);
954 st->cr();
955 }
956
957 STEP("printing code blobs if possible")
958
959 if (_verbose) {
960 const int printed_capacity = max_error_log_print_code;
961 address printed[printed_capacity];
962 printed[0] = nullptr;
963 int printed_len = 0;
964 // Even though ErrorLogPrintCodeLimit is ranged checked
965 // during argument parsing, there's no way to prevent it
966 // subsequently (i.e., after parsing) being set to a
967 // value outside the range.
968 int limit = MIN2(ErrorLogPrintCodeLimit, printed_capacity);
969 if (limit > 0) {
970 // Check if a pc was found by native stack trace above.
971 if (lastpc != nullptr) {
972 if (print_code(st, _thread, lastpc, true, printed, printed_capacity)) {
973 printed_len++;
974 }
975 }
976
977 // Scan the native stack
978 if (!_print_native_stack_used) {
979 // Only try to print code of the crashing frame since
980 // the native stack cannot be walked with next_frame.
981 if (print_code(st, _thread, _pc, true, printed, printed_capacity)) {
982 printed_len++;
983 }
984 } else {
985 frame fr = _context ? os::fetch_frame_from_context(_context)
986 : os::current_frame();
987 while (printed_len < limit && fr.pc() != nullptr) {
988 if (print_code(st, _thread, fr.pc(), fr.pc() == _pc, printed, printed_capacity)) {
989 printed_len++;
990 }
991 fr = next_frame(fr, _thread);
992 }
993 }
994
995 // Scan the Java stack
996 if (_thread != nullptr && _thread->is_Java_thread()) {
997 JavaThread* jt = _thread->as_Java_thread();
998 if (jt->has_last_Java_frame()) {
999 for (StackFrameStream sfs(jt, true /* update */, true /* process_frames */); printed_len < limit && !sfs.is_done(); sfs.next()) {
1000 address pc = sfs.current()->pc();
1001 if (print_code(st, _thread, pc, pc == _pc, printed, printed_capacity)) {
1002 printed_len++;
1003 }
1004 }
1005 }
1006 }
1007 }
1008 }
1009
1010 STEP("printing VM operation")
1011
1012 if (_verbose && _thread && _thread->is_VM_thread()) {
1013 VMThread* t = (VMThread*)_thread;
1014 VM_Operation* op = t->vm_operation();
1015 if (op) {
1016 op->print_on_error(st);
1017 st->cr();
1018 st->cr();
1019 }
1020 }
1021
1022 STEP("printing process")
1023
1024 if (_verbose) {
1025 st->cr();
1026 st->print_cr("--------------- P R O C E S S ---------------");
1027 st->cr();
1028 }
1029
1030 #ifndef _WIN32
1031 STEP("printing user info")
1032
1033 if (ExtensiveErrorReports && _verbose) {
1034 os::Posix::print_user_info(st);
1035 }
1036 #endif
1037
1038 STEP("printing all threads")
1039
1040 // all threads
1041 if (_verbose && _thread) {
1042 Threads::print_on_error(st, _thread, buf, sizeof(buf));
1043 st->cr();
1044 }
1045
1046 STEP("printing VM state")
1047
1048 if (_verbose) {
1049 // Safepoint state
1050 st->print("VM state: ");
1051
1052 if (SafepointSynchronize::is_synchronizing()) st->print("synchronizing");
1053 else if (SafepointSynchronize::is_at_safepoint()) st->print("at safepoint");
1054 else st->print("not at safepoint");
1055
1056 // Also see if error occurred during initialization or shutdown
1057 if (!Universe::is_fully_initialized()) {
1058 st->print(" (not fully initialized)");
1059 } else if (VM_Exit::vm_exited()) {
1060 st->print(" (shutting down)");
1061 } else {
1062 st->print(" (normal execution)");
1063 }
1064 st->cr();
1065 st->cr();
1066 }
1067
1068 STEP("printing owned locks on error")
1069
1070 // mutexes/monitors that currently have an owner
1071 if (_verbose) {
1072 print_owned_locks_on_error(st);
1073 st->cr();
1074 }
1075
1076 STEP("printing number of OutOfMemoryError and StackOverflow exceptions")
1077
1078 if (_verbose && Exceptions::has_exception_counts()) {
1079 st->print_cr("OutOfMemory and StackOverflow Exception counts:");
1080 Exceptions::print_exception_counts_on_error(st);
1081 st->cr();
1082 }
1083
1084 #ifdef _LP64
1085 STEP("printing compressed oops mode")
1086
1087 if (_verbose && UseCompressedOops) {
1088 CompressedOops::print_mode(st);
1089 st->cr();
1090 }
1091
1092 STEP("printing compressed klass pointers mode")
1093
1094 if (_verbose && UseCompressedClassPointers) {
1095 CDS_ONLY(MetaspaceShared::print_on(st);)
1096 Metaspace::print_compressed_class_space(st);
1097 CompressedKlassPointers::print_mode(st);
1098 st->cr();
1099 }
1100 #endif
1101
1102 STEP("printing heap information")
1103
1104 if (_verbose) {
1105 GCLogPrecious::print_on_error(st);
1106
1107 if (Universe::heap() != NULL) {
1108 Universe::heap()->print_on_error(st);
1109 st->cr();
1110 }
1111
1112 if (Universe::is_fully_initialized()) {
1113 st->print_cr("Polling page: " INTPTR_FORMAT, p2i(SafepointMechanism::get_polling_page()));
1114 st->cr();
1115 }
1116 }
1117
1118 STEP("printing metaspace information")
1119
1120 if (_verbose && Universe::is_fully_initialized()) {
1121 st->print_cr("Metaspace:");
1122 MetaspaceUtils::print_basic_report(st, 0);
1123 }
1124
1125 STEP("printing code cache information")
1126
1127 if (_verbose && Universe::is_fully_initialized()) {
1128 // print code cache information before vm abort
1129 CodeCache::print_summary(st);
1130 st->cr();
1131 }
1132
1133 STEP("printing ring buffers")
1134
1135 if (_verbose) {
1136 Events::print_all(st);
1137 st->cr();
1138 }
1139
1140 STEP("printing dynamic libraries")
1141
1142 if (_verbose) {
1143 // dynamic libraries, or memory map
1144 os::print_dll_info(st);
1145 st->cr();
1146 }
1147
1148 STEP("printing native decoder state")
1149
1150 if (_verbose) {
1151 Decoder::print_state_on(st);
1152 st->cr();
1153 }
1154
1155 STEP("printing VM options")
1156
1157 if (_verbose) {
1158 // VM options
1159 Arguments::print_on(st);
1160 st->cr();
1161 }
1162
1163 STEP("printing flags")
1164
1165 if (_verbose) {
1166 JVMFlag::printFlags(
1167 st,
1168 true, // with comments
1169 false, // no ranges
1170 true); // skip defaults
1171 st->cr();
1172 }
1173
1174 STEP("printing warning if internal testing API used")
1175
1176 if (WhiteBox::used()) {
1177 st->print_cr("Unsupported internal testing APIs have been used.");
1178 st->cr();
1179 }
1180
1181 STEP("printing log configuration")
1182 if (_verbose){
1183 st->print_cr("Logging:");
1184 LogConfiguration::describe_current_configuration(st);
1185 st->cr();
1186 }
1187
1188 STEP("printing all environment variables")
1189
1190 if (_verbose) {
1191 os::print_environment_variables(st, env_list);
1192 st->cr();
1193 }
1194
1195 #ifndef _WIN32
1196 STEP("printing locale settings")
1197
1198 if (_verbose) {
1199 os::Posix::print_active_locale(st);
1200 st->cr();
1201 }
1202 #endif
1203
1204 STEP("printing signal handlers")
1205
1206 if (_verbose) {
1207 os::print_signal_handlers(st, buf, sizeof(buf));
1208 st->cr();
1209 }
1210
1211 STEP("Native Memory Tracking")
1212 if (_verbose) {
1213 MemTracker::error_report(st);
1214 st->cr();
1215 }
1216
1217 STEP("printing periodic trim state")
1218
1219 if (_verbose) {
1220 NativeHeapTrimmer::print_state(st);
1221 st->cr();
1222 }
1223
1224 STEP("printing system")
1225
1226 if (_verbose) {
1227 st->cr();
1228 st->print_cr("--------------- S Y S T E M ---------------");
1229 st->cr();
1230 }
1231
1232 STEP("printing OS information")
1233
1234 if (_verbose) {
1235 os::print_os_info(st);
1236 st->cr();
1237 }
1238
1239 STEP("printing CPU info")
1240 if (_verbose) {
1241 os::print_cpu_info(st, buf, sizeof(buf));
1242 st->cr();
1243 }
1244
1245 STEP("printing memory info")
1246
1247 if (_verbose) {
1248 os::print_memory_info(st);
1249 st->cr();
1250 }
1251
1252 STEP("printing internal vm info")
1253
1254 if (_verbose) {
1255 st->print_cr("vm_info: %s", VM_Version::internal_vm_info_string());
1256 st->cr();
1257 }
1258
1259 // print a defined marker to show that error handling finished correctly.
1260 STEP("printing end marker")
1261
1262 if (_verbose) {
1263 st->print_cr("END.");
1264 }
1265
1266 END
1267
1268 # undef BEGIN
1269 # undef STEP
1270 # undef END
1271 }
1272
1273 // Report for the vm_info_cmd. This prints out the information above omitting
1274 // crash and thread specific information. If output is added above, it should be added
1275 // here also, if it is safe to call during a running process.
1276 void VMError::print_vm_info(outputStream* st) {
1277
1278 char buf[O_BUFLEN];
1279 report_vm_version(st, buf, sizeof(buf));
1280
1281 // STEP("printing summary")
1282
1283 st->cr();
1284 st->print_cr("--------------- S U M M A R Y ------------");
1285 st->cr();
1286
1287 // STEP("printing VM option summary")
1288
1289 // VM options
1290 Arguments::print_summary_on(st);
1291 st->cr();
1292
1293 // STEP("printing summary machine and OS info")
1294
1295 os::print_summary_info(st, buf, sizeof(buf));
1296
1297 // STEP("printing date and time")
1298
1299 os::print_date_and_time(st, buf, sizeof(buf));
1300
1301 // Skip: STEP("printing thread")
1302
1303 // STEP("printing process")
1304
1305 st->cr();
1306 st->print_cr("--------------- P R O C E S S ---------------");
1307 st->cr();
1308
1309 // STEP("printing number of OutOfMemoryError and StackOverflow exceptions")
1310
1311 if (Exceptions::has_exception_counts()) {
1312 st->print_cr("OutOfMemory and StackOverflow Exception counts:");
1313 Exceptions::print_exception_counts_on_error(st);
1314 st->cr();
1315 }
1316
1317 #ifdef _LP64
1318 // STEP("printing compressed oops mode")
1319 if (UseCompressedOops) {
1320 CompressedOops::print_mode(st);
1321 st->cr();
1322 }
1323
1324 // STEP("printing compressed class ptrs mode")
1325 if (UseCompressedClassPointers) {
1326 CDS_ONLY(MetaspaceShared::print_on(st);)
1327 Metaspace::print_compressed_class_space(st);
1328 CompressedKlassPointers::print_mode(st);
1329 st->cr();
1330 }
1331 #endif
1332
1333 // STEP("printing heap information")
1334
1335 if (Universe::is_fully_initialized()) {
1336 MutexLocker hl(Heap_lock);
1337 GCLogPrecious::print_on_error(st);
1338 Universe::heap()->print_on_error(st);
1339 st->cr();
1340 st->print_cr("Polling page: " INTPTR_FORMAT, p2i(SafepointMechanism::get_polling_page()));
1341 st->cr();
1342 }
1343
1344 // STEP("printing metaspace information")
1345
1346 if (Universe::is_fully_initialized()) {
1347 st->print_cr("Metaspace:");
1348 MetaspaceUtils::print_basic_report(st, 0);
1349 }
1350
1351 // STEP("printing code cache information")
1352
1353 if (Universe::is_fully_initialized()) {
1354 // print code cache information before vm abort
1355 CodeCache::print_summary(st);
1356 st->cr();
1357 }
1358
1359 // STEP("printing ring buffers")
1360
1361 Events::print_all(st);
1362 st->cr();
1363
1364 // STEP("printing dynamic libraries")
1365
1366 // dynamic libraries, or memory map
1367 os::print_dll_info(st);
1368 st->cr();
1369
1370 // STEP("printing VM options")
1371
1372 // VM options
1373 Arguments::print_on(st);
1374 st->cr();
1375
1376 // STEP("printing warning if internal testing API used")
1377
1378 if (WhiteBox::used()) {
1379 st->print_cr("Unsupported internal testing APIs have been used.");
1380 st->cr();
1381 }
1382
1383 // STEP("printing log configuration")
1384 st->print_cr("Logging:");
1385 LogConfiguration::describe(st);
1386 st->cr();
1387
1388 // STEP("printing all environment variables")
1389
1390 os::print_environment_variables(st, env_list);
1391 st->cr();
1392
1393 // STEP("printing locale settings")
1394 #ifndef _WIN32
1395 os::Posix::print_active_locale(st);
1396 st->cr();
1397 #endif
1398
1399 // STEP("printing signal handlers")
1400
1401 os::print_signal_handlers(st, buf, sizeof(buf));
1402 st->cr();
1403
1404 // STEP("Native Memory Tracking")
1405
1406 MemTracker::error_report(st);
1407 st->cr();
1408
1409 // STEP("printing periodic trim state")
1410 NativeHeapTrimmer::print_state(st);
1411 st->cr();
1412
1413
1414 // STEP("printing system")
1415 st->print_cr("--------------- S Y S T E M ---------------");
1416 st->cr();
1417
1418 // STEP("printing OS information")
1419
1420 os::print_os_info(st);
1421 st->cr();
1422
1423 // STEP("printing CPU info")
1424
1425 os::print_cpu_info(st, buf, sizeof(buf));
1426 st->cr();
1427
1428 // STEP("printing memory info")
1429
1430 os::print_memory_info(st);
1431 st->cr();
1432
1433 // STEP("printing internal vm info")
1434
1435 st->print_cr("vm_info: %s", VM_Version::internal_vm_info_string());
1436 st->cr();
1437
1438 // print a defined marker to show that error handling finished correctly.
1439 // STEP("printing end marker")
1440
1441 st->print_cr("END.");
1442 }
1443
1444 /** Expand a pattern into a buffer starting at pos and open a file using constructed path */
1445 static int expand_and_open(const char* pattern, bool overwrite_existing, char* buf, size_t buflen, size_t pos) {
1446 int fd = -1;
1447 int mode = O_RDWR | O_CREAT;
1448 if (overwrite_existing) {
1449 mode |= O_TRUNC;
1450 } else {
1451 mode |= O_EXCL;
1452 }
1453 if (Arguments::copy_expand_pid(pattern, strlen(pattern), &buf[pos], buflen - pos)) {
1454 fd = open(buf, mode, 0666);
1455 }
1456 return fd;
1457 }
1458
1459 /**
1460 * Construct file name for a log file and return it's file descriptor.
1461 * Name and location depends on pattern, default_pattern params and access
1462 * permissions.
1463 */
1464 static int prepare_log_file(const char* pattern, const char* default_pattern, bool overwrite_existing, char* buf, size_t buflen) {
1465 int fd = -1;
1466
1467 // If possible, use specified pattern to construct log file name
1468 if (pattern != NULL) {
1469 fd = expand_and_open(pattern, overwrite_existing, buf, buflen, 0);
1470 }
1471
1472 // Either user didn't specify, or the user's location failed,
1473 // so use the default name in the current directory
1474 if (fd == -1) {
1475 const char* cwd = os::get_current_directory(buf, buflen);
1476 if (cwd != NULL) {
1477 size_t pos = strlen(cwd);
1478 int fsep_len = jio_snprintf(&buf[pos], buflen-pos, "%s", os::file_separator());
1479 pos += fsep_len;
1480 if (fsep_len > 0) {
1481 fd = expand_and_open(default_pattern, overwrite_existing, buf, buflen, pos);
1482 }
1483 }
1484 }
1485
1486 // try temp directory if it exists.
1487 if (fd == -1) {
1488 const char* tmpdir = os::get_temp_directory();
1489 if (tmpdir != NULL && strlen(tmpdir) > 0) {
1490 int pos = jio_snprintf(buf, buflen, "%s%s", tmpdir, os::file_separator());
1491 if (pos > 0) {
1492 fd = expand_and_open(default_pattern, overwrite_existing, buf, buflen, pos);
1493 }
1494 }
1495 }
1496
1497 return fd;
1498 }
1499
1500 void VMError::report_and_die(Thread* thread, unsigned int sig, address pc, void* siginfo,
1501 void* context, const char* detail_fmt, ...)
1502 {
1503 va_list detail_args;
1504 va_start(detail_args, detail_fmt);
1505 report_and_die(sig, NULL, detail_fmt, detail_args, thread, pc, siginfo, context, NULL, 0, 0);
1506 va_end(detail_args);
1507 }
1508
1509 void VMError::report_and_die(Thread* thread, unsigned int sig, address pc, void* siginfo, void* context)
1510 {
1511 report_and_die(thread, sig, pc, siginfo, context, "%s", "");
1512 }
1513
1514 void VMError::report_and_die(Thread* thread, void* context, const char* filename, int lineno, const char* message,
1515 const char* detail_fmt, va_list detail_args)
1516 {
1517 report_and_die(INTERNAL_ERROR, message, detail_fmt, detail_args, thread, NULL, NULL, context, filename, lineno, 0);
1518 }
1519
1520 void VMError::report_and_die(Thread* thread, const char* filename, int lineno, size_t size,
1521 VMErrorType vm_err_type, const char* detail_fmt, va_list detail_args) {
1522 report_and_die(vm_err_type, NULL, detail_fmt, detail_args, thread, NULL, NULL, NULL, filename, lineno, size);
1523 }
1524
1525 void VMError::report_and_die(int id, const char* message, const char* detail_fmt, va_list detail_args,
1526 Thread* thread, address pc, void* siginfo, void* context, const char* filename,
1527 int lineno, size_t size)
1528 {
1529 // A single scratch buffer to be used from here on.
1530 // Do not rely on it being preserved across function calls.
1531 static char buffer[O_BUFLEN];
1532
1533 // File descriptor to tty to print an error summary to.
1534 // Hard wired to stdout; see JDK-8215004 (compatibility concerns).
1535 static const int fd_out = 1; // stdout
1536
1537 // File descriptor to the error log file.
1538 static int fd_log = -1;
1539
1540 #ifdef CAN_SHOW_REGISTERS_ON_ASSERT
1541 // Disarm assertion poison page, since from this point on we do not need this mechanism anymore and it may
1542 // cause problems in error handling during native OOM, see JDK-8227275.
1543 disarm_assert_poison();
1544 #endif
1545
1546 // Use local fdStream objects only. Do not use global instances whose initialization
1547 // relies on dynamic initialization (see JDK-8214975). Do not rely on these instances
1548 // to carry over into recursions or invocations from other threads.
1549 fdStream out(fd_out);
1550 out.set_scratch_buffer(buffer, sizeof(buffer));
1551
1552 // Depending on the re-entrance depth at this point, fd_log may be -1 or point to an open hs-err file.
1553 fdStream log(fd_log);
1554 log.set_scratch_buffer(buffer, sizeof(buffer));
1555
1556 // How many errors occurred in error handler when reporting first_error.
1557 static int recursive_error_count;
1558
1559 // We will first print a brief message to standard out (verbose = false),
1560 // then save detailed information in log file (verbose = true).
1561 static bool out_done = false; // done printing to standard out
1562 static bool log_done = false; // done saving error log
1563
1564 intptr_t mytid = os::current_thread_id();
1565 if (_first_error_tid == -1 &&
1566 Atomic::cmpxchg(&_first_error_tid, (intptr_t)-1, mytid) == -1) {
1567
1568 if (SuppressFatalErrorMessage) {
1569 os::abort(CreateCoredumpOnCrash);
1570 }
1571
1572 // Initialize time stamps to use the same base.
1573 out.time_stamp().update_to(1);
1574 log.time_stamp().update_to(1);
1575
1576 _id = id;
1577 _message = message;
1578 _thread = thread;
1579 _pc = pc;
1580 _siginfo = siginfo;
1581 _context = context;
1582 _filename = filename;
1583 _lineno = lineno;
1584 _size = size;
1585 jio_vsnprintf(_detail_msg, sizeof(_detail_msg), detail_fmt, detail_args);
1586
1587 reporting_started();
1588 if (!TestUnresponsiveErrorHandler) {
1589 // Record reporting_start_time unless we're running the
1590 // TestUnresponsiveErrorHandler test. For that test we record
1591 // reporting_start_time at the beginning of the test.
1592 record_reporting_start_time();
1593 } else {
1594 out.print_raw_cr("Delaying recording reporting_start_time for TestUnresponsiveErrorHandler.");
1595 }
1596
1597 if (ShowMessageBoxOnError || PauseAtExit) {
1598 show_message_box(buffer, sizeof(buffer));
1599
1600 // User has asked JVM to abort. Reset ShowMessageBoxOnError so the
1601 // WatcherThread can kill JVM if the error handler hangs.
1602 ShowMessageBoxOnError = false;
1603 }
1604
1605 os::check_dump_limit(buffer, sizeof(buffer));
1606
1607 // reset signal handlers or exception filter; make sure recursive crashes
1608 // are handled properly.
1609 install_secondary_signal_handler();
1610 } else {
1611 #if defined(_WINDOWS)
1612 // If UseOSErrorReporting we call this for each level of the call stack
1613 // while searching for the exception handler. Only the first level needs
1614 // to be reported.
1615 if (UseOSErrorReporting && log_done) return;
1616 #endif
1617
1618 // This is not the first error, see if it happened in a different thread
1619 // or in the same thread during error reporting.
1620 if (_first_error_tid != mytid) {
1621 if (!SuppressFatalErrorMessage) {
1622 char msgbuf[64];
1623 jio_snprintf(msgbuf, sizeof(msgbuf),
1624 "[thread " INTX_FORMAT " also had an error]",
1625 mytid);
1626 out.print_raw_cr(msgbuf);
1627 }
1628
1629 // Error reporting is not MT-safe, nor can we let the current thread
1630 // proceed, so we block it.
1631 os::infinite_sleep();
1632
1633 } else {
1634 if (recursive_error_count++ > 30) {
1635 if (!SuppressFatalErrorMessage) {
1636 out.print_raw_cr("[Too many errors, abort]");
1637 }
1638 os::die();
1639 }
1640
1641 if (SuppressFatalErrorMessage) {
1642 // If we already hit a secondary error during abort, then calling
1643 // it again is likely to hit another one. But eventually, if we
1644 // don't deadlock somewhere, we will call os::die() above.
1645 os::abort(CreateCoredumpOnCrash);
1646 }
1647
1648 outputStream* const st = log.is_open() ? &log : &out;
1649 st->cr();
1650
1651 // Timeout handling.
1652 if (_step_did_timeout) {
1653 // The current step had a timeout. Lets continue reporting with the next step.
1654 st->print_raw("[timeout occurred during error reporting in step \"");
1655 st->print_raw(_current_step_info);
1656 st->print_cr("\"] after " INT64_FORMAT " s.",
1657 (int64_t)
1658 ((get_current_timestamp() - _step_start_time) / TIMESTAMP_TO_SECONDS_FACTOR));
1659 } else if (_reporting_did_timeout) {
1660 // We hit ErrorLogTimeout. Reporting will stop altogether. Let's wrap things
1661 // up, the process is about to be stopped by the WatcherThread.
1662 st->print_cr("------ Timeout during error reporting after " INT64_FORMAT " s. ------",
1663 (int64_t)
1664 ((get_current_timestamp() - _reporting_start_time) / TIMESTAMP_TO_SECONDS_FACTOR));
1665 st->flush();
1666 // Watcherthread is about to call os::die. Lets just wait.
1667 os::infinite_sleep();
1668 } else {
1669 // Crash or assert during error reporting. Lets continue reporting with the next step.
1670 stringStream ss(buffer, sizeof(buffer));
1671 // Note: this string does get parsed by a number of jtreg tests,
1672 // see hotspot/jtreg/runtime/ErrorHandling.
1673 ss.print("[error occurred during error reporting (%s), id 0x%x",
1674 _current_step_info, id);
1675 char signal_name[64];
1676 if (os::exception_name(id, signal_name, sizeof(signal_name))) {
1677 ss.print(", %s (0x%x) at pc=" PTR_FORMAT, signal_name, id, p2i(pc));
1678 } else {
1679 if (should_report_bug(id)) {
1680 ss.print(", Internal Error (%s:%d)",
1681 filename == NULL ? "??" : filename, lineno);
1682 } else {
1683 ss.print(", Out of Memory Error (%s:%d)",
1684 filename == NULL ? "??" : filename, lineno);
1685 }
1686 }
1687 ss.print("]");
1688 st->print_raw_cr(buffer);
1689 st->cr();
1690 }
1691 }
1692 }
1693
1694 // Part 1: print an abbreviated version (the '#' section) to stdout.
1695 if (!out_done) {
1696 // Suppress this output if we plan to print Part 2 to stdout too.
1697 // No need to have the "#" section twice.
1698 if (!(ErrorFileToStdout && out.fd() == 1)) {
1699 report(&out, false);
1700 }
1701
1702 out_done = true;
1703
1704 _current_step = 0;
1705 _current_step_info = "";
1706 }
1707
1708 // Part 2: print a full error log file (optionally to stdout or stderr).
1709 // print to error log file
1710 if (!log_done) {
1711 // see if log file is already open
1712 if (!log.is_open()) {
1713 // open log file
1714 if (ErrorFileToStdout) {
1715 fd_log = 1;
1716 } else if (ErrorFileToStderr) {
1717 fd_log = 2;
1718 } else {
1719 fd_log = prepare_log_file(ErrorFile, "hs_err_pid%p.log", true,
1720 buffer, sizeof(buffer));
1721 if (fd_log != -1) {
1722 out.print_raw("# An error report file with more information is saved as:\n# ");
1723 out.print_raw_cr(buffer);
1724 } else {
1725 out.print_raw_cr("# Can not save log file, dump to screen..");
1726 fd_log = 1;
1727 }
1728 }
1729 log.set_fd(fd_log);
1730 }
1731
1732 report(&log, true);
1733 log_done = true;
1734 _current_step = 0;
1735 _current_step_info = "";
1736
1737 if (fd_log > 3) {
1738 close(fd_log);
1739 fd_log = -1;
1740 }
1741
1742 log.set_fd(-1);
1743 }
1744
1745 JFR_ONLY(Jfr::on_vm_shutdown(true);)
1746
1747 if (PrintNMTStatistics) {
1748 fdStream fds(fd_out);
1749 MemTracker::final_report(&fds);
1750 }
1751
1752 static bool skip_replay = ReplayCompiles; // Do not overwrite file during replay
1753 if (DumpReplayDataOnError && _thread && _thread->is_Compiler_thread() && !skip_replay) {
1754 skip_replay = true;
1755 ciEnv* env = ciEnv::current();
1756 if (env != NULL) {
1757 const bool overwrite = false; // We do not overwrite an existing replay file.
1758 int fd = prepare_log_file(ReplayDataFile, "replay_pid%p.log", overwrite, buffer, sizeof(buffer));
1759 if (fd != -1) {
1760 FILE* replay_data_file = os::open(fd, "w");
1761 if (replay_data_file != NULL) {
1762 fileStream replay_data_stream(replay_data_file, /*need_close=*/true);
1763 env->dump_replay_data_unsafe(&replay_data_stream);
1764 out.print_raw("#\n# Compiler replay data is saved as:\n# ");
1765 out.print_raw_cr(buffer);
1766 } else {
1767 int e = errno;
1768 out.print_raw("#\n# Can't open file to dump replay data. Error: ");
1769 out.print_raw_cr(os::strerror(e));
1770 close(fd);
1771 }
1772 }
1773 }
1774 }
1775
1776 static bool skip_bug_url = !should_submit_bug_report(_id);
1777 if (!skip_bug_url) {
1778 skip_bug_url = true;
1779
1780 out.print_raw_cr("#");
1781 print_bug_submit_message(&out, _thread);
1782 }
1783
1784 static bool skip_OnError = false;
1785 if (!skip_OnError && OnError && OnError[0]) {
1786 skip_OnError = true;
1787
1788 // Flush output and finish logs before running OnError commands.
1789 ostream_abort();
1790
1791 out.print_raw_cr("#");
1792 out.print_raw ("# -XX:OnError=\"");
1793 out.print_raw (OnError);
1794 out.print_raw_cr("\"");
1795
1796 char* cmd;
1797 const char* ptr = OnError;
1798 while ((cmd = next_OnError_command(buffer, sizeof(buffer), &ptr)) != NULL){
1799 out.print_raw ("# Executing ");
1800 #if defined(LINUX) || defined(_ALLBSD_SOURCE)
1801 out.print_raw ("/bin/sh -c ");
1802 #elif defined(_WINDOWS)
1803 out.print_raw ("cmd /C ");
1804 #endif
1805 out.print_raw ("\"");
1806 out.print_raw (cmd);
1807 out.print_raw_cr("\" ...");
1808
1809 if (os::fork_and_exec(cmd) < 0) {
1810 out.print_cr("os::fork_and_exec failed: %s (%s=%d)",
1811 os::strerror(errno), os::errno_name(errno), errno);
1812 }
1813 }
1814
1815 // done with OnError
1816 OnError = NULL;
1817 }
1818
1819 if (WINDOWS_ONLY(!UseOSErrorReporting) NOT_WINDOWS(true)) {
1820 // os::abort() will call abort hooks, try it first.
1821 static bool skip_os_abort = false;
1822 if (!skip_os_abort) {
1823 skip_os_abort = true;
1824 bool dump_core = should_report_bug(_id);
1825 os::abort(dump_core && CreateCoredumpOnCrash, _siginfo, _context);
1826 }
1827
1828 // if os::abort() doesn't abort, try os::die();
1829 os::die();
1830 }
1831 }
1832
1833 /*
1834 * OnOutOfMemoryError scripts/commands executed while VM is a safepoint - this
1835 * ensures utilities such as jmap can observe the process is a consistent state.
1836 */
1837 class VM_ReportJavaOutOfMemory : public VM_Operation {
1838 private:
1839 const char* _message;
1840 public:
1841 VM_ReportJavaOutOfMemory(const char* message) { _message = message; }
1842 VMOp_Type type() const { return VMOp_ReportJavaOutOfMemory; }
1843 void doit();
1844 };
1845
1846 void VM_ReportJavaOutOfMemory::doit() {
1847 // Don't allocate large buffer on stack
1848 static char buffer[O_BUFLEN];
1849
1850 tty->print_cr("#");
1851 tty->print_cr("# java.lang.OutOfMemoryError: %s", _message);
1852 tty->print_cr("# -XX:OnOutOfMemoryError=\"%s\"", OnOutOfMemoryError);
1853
1854 // make heap parsability
1855 Universe::heap()->ensure_parsability(false); // no need to retire TLABs
1856
1857 char* cmd;
1858 const char* ptr = OnOutOfMemoryError;
1859 while ((cmd = next_OnError_command(buffer, sizeof(buffer), &ptr)) != NULL){
1860 tty->print("# Executing ");
1861 #if defined(LINUX)
1862 tty->print ("/bin/sh -c ");
1863 #endif
1864 tty->print_cr("\"%s\"...", cmd);
1865
1866 if (os::fork_and_exec(cmd, true) < 0) {
1867 tty->print_cr("os::fork_and_exec failed: %s (%s=%d)",
1868 os::strerror(errno), os::errno_name(errno), errno);
1869 }
1870 }
1871 }
1872
1873 void VMError::report_java_out_of_memory(const char* message) {
1874 if (OnOutOfMemoryError && OnOutOfMemoryError[0]) {
1875 MutexLocker ml(Heap_lock);
1876 VM_ReportJavaOutOfMemory op(message);
1877 VMThread::execute(&op);
1878 }
1879 }
1880
1881 void VMError::show_message_box(char *buf, int buflen) {
1882 bool yes;
1883 do {
1884 error_string(buf, buflen);
1885 yes = os::start_debugging(buf,buflen);
1886 } while (yes);
1887 }
1888
1889 // Fatal error handling is subject to several timeouts:
1890 // - a global timeout (controlled via ErrorLogTimeout)
1891 // - local error reporting step timeouts.
1892 //
1893 // The latter aims to "give the JVM a kick" if it gets stuck in one particular place during
1894 // error reporting. This prevents one error reporting step from hogging all the time allotted
1895 // to error reporting under ErrorLogTimeout.
1896 //
1897 // VMError::check_timeout() is called from the watcher thread and checks for either global
1898 // or step timeout. If a timeout happened, we interrupt the reporting thread and set either
1899 // _reporting_did_timeout or _step_did_timeout to signal which timeout fired. Function returns
1900 // true if the *global* timeout fired, which will cause WatcherThread to shut down the JVM
1901 // immediately.
1902 bool VMError::check_timeout() {
1903
1904 // This function is supposed to be called from watcher thread during fatal error handling only.
1905 assert(VMError::is_error_reported(), "Only call during error handling");
1906 assert(Thread::current()->is_Watcher_thread(), "Only call from watcher thread");
1907
1908 if (ErrorLogTimeout == 0) {
1909 return false;
1910 }
1911
1912 // There are three situations where we suppress the *global* error timeout:
1913 // - if the JVM is embedded and the launcher has its abort hook installed.
1914 // That must be allowed to run.
1915 // - if the user specified one or more OnError commands to run, and these
1916 // did not yet run. These must have finished.
1917 // - if the user (typically developer) specified ShowMessageBoxOnError,
1918 // and the error box has not yet been shown
1919 const bool ignore_global_timeout =
1920 (ShowMessageBoxOnError
1921 || (OnError != nullptr && OnError[0] != '\0')
1922 || Arguments::abort_hook() != nullptr);
1923
1924 const jlong now = get_current_timestamp();
1925
1926 // Global timeout hit?
1927 if (!ignore_global_timeout) {
1928 const jlong reporting_start_time = get_reporting_start_time();
1929 // Timestamp is stored in nanos.
1930 if (reporting_start_time > 0) {
1931 const jlong end = reporting_start_time + (jlong)ErrorLogTimeout * TIMESTAMP_TO_SECONDS_FACTOR;
1932 if (end <= now && !_reporting_did_timeout) {
1933 // We hit ErrorLogTimeout and we haven't interrupted the reporting
1934 // thread yet.
1935 _reporting_did_timeout = true;
1936 interrupt_reporting_thread();
1937 return true; // global timeout
1938 }
1939 }
1940 }
1941
1942 // Reporting step timeout?
1943 const jlong step_start_time = get_step_start_time();
1944 if (step_start_time > 0) {
1945 // A step times out after a quarter of the total timeout. Steps are mostly fast unless they
1946 // hang for some reason, so this simple rule allows for three hanging step and still
1947 // hopefully leaves time enough for the rest of the steps to finish.
1948 const int max_step_timeout_secs = 5;
1949 const jlong timeout_duration = MAX2((jlong)max_step_timeout_secs, (jlong)ErrorLogTimeout * TIMESTAMP_TO_SECONDS_FACTOR / 4);
1950 const jlong end = step_start_time + timeout_duration;
1951 if (end <= now && !_step_did_timeout) {
1952 // The step timed out and we haven't interrupted the reporting
1953 // thread yet.
1954 _step_did_timeout = true;
1955 interrupt_reporting_thread();
1956 return false; // (Not a global timeout)
1957 }
1958 }
1959
1960 return false;
1961
1962 }
1963
1964 #ifdef ASSERT
1965 typedef void (*voidfun_t)();
1966
1967 // Crash with an authentic sigfpe
1968 volatile int sigfpe_int = 0;
1969 static void crash_with_sigfpe() {
1970
1971 // generate a native synchronous SIGFPE where possible;
1972 sigfpe_int = sigfpe_int/sigfpe_int;
1973
1974 // if that did not cause a signal (e.g. on ppc), just
1975 // raise the signal.
1976 #ifndef _WIN32
1977 // OSX implements raise(sig) incorrectly so we need to
1978 // explicitly target the current thread
1979 pthread_kill(pthread_self(), SIGFPE);
1980 #endif
1981
1982 } // end: crash_with_sigfpe
1983
1984 // crash with sigsegv at non-null address.
1985 static void crash_with_segfault() {
1986
1987 int* crash_addr = reinterpret_cast<int*>(VMError::segfault_address);
1988 *crash_addr = 1;
1989
1990 } // end: crash_with_segfault
1991
1992 // crash in a controlled way:
1993 // 1 - assert
1994 // 2 - guarantee
1995 // 14 - SIGSEGV
1996 // 15 - SIGFPE
1997 void VMError::controlled_crash(int how) {
1998
1999 // Case 14 is tested by test/hotspot/jtreg/runtime/ErrorHandling/SafeFetchInErrorHandlingTest.java.
2000 // Case 15 is tested by test/hotspot/jtreg/runtime/ErrorHandling/SecondaryErrorTest.java.
2001 // Case 16 is tested by test/hotspot/jtreg/runtime/ErrorHandling/ThreadsListHandleInErrorHandlingTest.java.
2002 // Case 17 is tested by test/hotspot/jtreg/runtime/ErrorHandling/NestedThreadsListHandleInErrorHandlingTest.java.
2003
2004 // We try to grab Threads_lock to keep ThreadsSMRSupport::print_info_on()
2005 // from racing with Threads::add() or Threads::remove() as we
2006 // generate the hs_err_pid file. This makes our ErrorHandling tests
2007 // more stable.
2008 if (!Threads_lock->owned_by_self()) {
2009 Threads_lock->try_lock();
2010 // The VM is going to die so no need to unlock Thread_lock.
2011 }
2012
2013 switch (how) {
2014 case 1: assert(how == 0, "test assert"); break;
2015 case 2: guarantee(how == 0, "test guarantee"); break;
2016
2017 // The other cases are unused.
2018 case 14: crash_with_segfault(); break;
2019 case 15: crash_with_sigfpe(); break;
2020 case 16: {
2021 ThreadsListHandle tlh;
2022 fatal("Force crash with an active ThreadsListHandle.");
2023 }
2024 case 17: {
2025 ThreadsListHandle tlh;
2026 {
2027 ThreadsListHandle tlh2;
2028 fatal("Force crash with a nested ThreadsListHandle.");
2029 }
2030 }
2031 default:
2032 // If another number is given, give a generic crash.
2033 fatal("Crashing with number %d", how);
2034 }
2035 tty->print_cr("controlled_crash: survived intentional crash. Did you suppress the assert?");
2036 ShouldNotReachHere();
2037 }
2038 #endif // !ASSERT