RELEASE NOTES: JDK 17.0.11

Notes generated: Sat Dec 09 06:32:25 CET 2023

JEPs

None.

RELEASE NOTES

core-libs/java.lang

Issue Description
JDK-8307990

Fixed Indefinite `jspawnhelper` Hangs


Since JDK 13, executing commands in a sub-process uses the so-called POSIX_SPAWN launching mechanism (that is, -Djdk.lang.Process.launchMechanism=POSIX_SPAWN) by default on Linux. In cases where the parent JVM process terminates abnormally before the handshake between the JVM and the newly created jspawnhelper process has completed, jspawnhelper can hang indefinitely in JDK 13 to JDK 20. This issue is fixed in JDK 21. The issue was especially harmful if the parent process had open sockets, because in that case, the forked jspawnhelper process will inherit them and keep all the corresponding ports open, effectively preventing other processes from binding to them.

This misbehavior has been observed with applications which frequently fork child processes in environments with tight memory constraints. In such cases, the OS can kill the JVM in the middle of the forking process leading to the described issue. Restarting the JVM process after such a crash will be impossible if the new process tries to bind to the same ports as the initial application because they will be blocked by the hanging jspawnhelper child process.

The root cause of this issue is jspawnhelper's omission to close its writing end of the pipe, which is used for the handshake with the parent JVM. It was fixed by closing the writing end of the communication pipe before attempting to read data from the parent process. This way, jspawnhelper will reliably read an EOF event from the communication pipe and terminate once the parent process dies prematurely.

A second variant of this issue could happen because the handshaking code in the JDK didn't handle interrupts to write(2) correctly. This could lead to incomplete messages being sent to the jspawnhelper child process. The result is a deadlock between the parent thread and the child process which manifests itself in a jspawnhelper process being blocked while reading from a pipe and the following stack trace in the corresponding parent Java process: ` java.lang.Thread.State: RUNNABLE at java.lang.ProcessImpl.forkAndExec(java.base@17.0.7/Native Method) at java.lang.ProcessImpl.<init>(java.base@17.0.7/ProcessImpl.java:314) at java.lang.ProcessImpl.start(java.base@17.0.7/ProcessImpl.java:244) at java.lang.ProcessBuilder.start(java.base@17.0.7/ProcessBuilder.java:1110) at java.lang.ProcessBuilder.start(java.base@17.0.7/ProcessBuilder.java:1073) `


FIXED ISSUES

client-libs/2d

Priority Bug Summary
P3 JDK-8318951 Additional negative value check in JPEG decoding
P3 JDK-8313643 Update HarfBuzz to 8.2.2

client-libs/java.awt

Priority Bug Summary
P3 JDK-8316030 Update Libpng to 1.6.40

client-libs/javax.sound

Priority Bug Summary
P3 JDK-8301846 Invalid TargetDataLine after screen lock when using JFileChooser or COM library
P3 JDK-8301310 The SendRawSysexMessage test may cause a JVM crash

client-libs/javax.swing

Priority Bug Summary
P2 JDK-8300269 The selected item in an editable JComboBox with titled border is not visible in Aqua LAF
P4 JDK-8290399 [macos] Aqua LAF does not fire an action event if combo box menu is displayed
P4 JDK-7132796 [macosx] closed/javax/swing/JComboBox/4517214/bug4517214.java fails on MacOS
P4 JDK-8054572 [macosx] JComboBox paints the border incorrectly
P4 JDK-7148092 [macosx] When Alt+down arrow key is pressed, the combobox popup does not appear.
P4 JDK-8286846 test/jdk/javax/swing/plaf/aqua/CustomComboBoxFocusTest.java fails on mac aarch64

core-libs/java.lang

Priority Bug Summary
P3 JDK-8307990 jspawnhelper must close its writing side of a pipe before reading from it
P3 JDK-8311645 Memory leak in jspawnhelper spawnChild after JDK-8307990

core-libs/java.net

Priority Bug Summary
P3 JDK-8301787 java/net/httpclient/SpecialHeadersTest failing after JDK-8301306
P4 JDK-8301306 java/net/httpclient/* fail with -Xcomp
P4 JDK-8269258 java/net/httpclient/ManyRequestsLegacy.java failed with connection timeout

core-libs/java.nio

Priority Bug Summary
P4 JDK-8317603 Improve exception messages thrown by sun.nio.ch.Net native methods (win)

core-libs/java.util.concurrent

Priority Bug Summary
P4 JDK-8317960 [17u] Excessive CPU usage on AbstractQueuedSynchronized.isEnqueued

core-svc/debugger

Priority Bug Summary
P4 JDK-8318736 com/sun/jdi/JdwpOnThrowTest.java failed with "transport error 202: bind failed: Address already in use"

core-svc/java.lang.management

Priority Bug Summary
P4 JDK-8304074 [JMX] Add an approximation of total bytes allocated on the Java heap by the JVM

hotspot/compiler

Priority Bug Summary
P4 JDK-8320363 ppc64 TypeEntries::type_unknown logic looks wrong, missed optimization opportunity
P4 JDK-8302149 Speed up compiler/jsr292/methodHandleExceptions/TestAMEnotNPE.java

hotspot/gc

Priority Bug Summary
P1 JDK-8292946 GC lock/jni/jnilock001 test failed "assert(gch->gc_cause() == GCCause::_scavenge_alot || !gch->incremental_collection_failed()) failed: Twice in a row"
P2 JDK-8308043 Deadlock in TestCSLocker.java due to blocking GC while allocating
P4 JDK-8316418 containers/docker/TestMemoryWithCgroupV1.java get OOM killed with Parallel GC
P4 JDK-8289764 gc/lock tests failed with "OutOfMemoryError: Java heap space: failed reallocation of scalar replaced objects"

hotspot/jfr

Priority Bug Summary
P3 JDK-8295274 HelidonAppTest.java fails "assert(event->should_commit()) failed: invariant" from compiled frame"
P3 JDK-8287832 jdk/jfr/event/runtime/TestActiveSettingEvent.java failed with "Expected two batches of Active Setting events"
P3 JDK-8288663 JFR: Disabling the JfrThreadSampler commits only a partially disabled state

hotspot/jvmti

Priority Bug Summary
P4 JDK-8319961 JvmtiEnvBase doesn't zero _ext_event_callbacks

hotspot/runtime

Priority Bug Summary
P4 JDK-8313081 MonitoringSupport_lock should be unconditionally initialized after 8304074
P4 JDK-8312434 SPECjvm2008/xml.transform with CDS fails with "can't seal package nu.xom"
P4 JDK-8299494 Test vmTestbase/nsk/stress/except/except011.java failed: ExceptionInInitializerError: target class not found

infrastructure

Priority Bug Summary
P4 JDK-8320885 Bump update version for OpenJDK: jdk-17.0.11

security-libs/javax.net.ssl

Priority Bug Summary
P4 JDK-8310106 sun.security.ssl.SSLHandshake.getHandshakeProducer() incorrectly checks handshakeConsumers

xml/javax.xml.validation

Priority Bug Summary
P3 JDK-8298087 XML Schema Validation reports an required attribute twice via ErrorHandler
P4 JDK-8283994 Make Xerces DatatypeException stackless