RELEASE NOTES: JDK 18.0.2

Notes generated: Wed Apr 03 08:20:55 CEST 2024

JEPs

None.

RELEASE NOTES

hotspot/runtime

Issue Description
JDK-8281181

CPU Shares Ignored When Computing Active Processor Count


Previous JDK releases used an incorrect interpretation of the Linux cgroups parameter "cpu.shares". This might cause the JVM to use fewer CPUs than available, leading to an under utilization of CPU resources when the JVM is used inside a container.

Starting from this JDK release, by default, the JVM no longer considers "cpu.shares" when deciding the number of threads to be used by the various thread pools. The -XX:+UseContainerCpuShares command-line option can be used to revert to the previous behavior. This option is deprecated and may be removed in a future JDK release.

FIXED ISSUES

client-libs/2d

Priority Bug Summary
P3 JDK-8283217 Leak FcObjectSet in getFontConfigLocations() in fontpath.c
P4 JDK-8282628 Potential memory leak in sun.font.FontConfigManager.getFontConfig()
P4 JDK-8278549 UNIX sun/font coding misses SUSE distro detection on recent distro SUSE 15

client-libs/java.awt

Priority Bug Summary
P3 JDK-8284033 Leak XVisualInfo in getAllConfigs in awt_GraphicsEnv.c

core-libs/java.io:serialization

Priority Bug Summary
P3 JDK-8278065 Refactor subclassAudits to use ClassValue
P4 JDK-8277072 ObjectStreamClass caches keep ClassLoaders alive
P4 JDK-8280041 Retry loop issues in java.io.ClassCache

core-libs/java.lang.invoke

Priority Bug Summary
P4 JDK-8281168 Micro-optimize VarForm.getMemberName for interpreter

core-libs/java.lang.module

Priority Bug Summary
P3 JDK-8282444 Module finder incorrectly assumes default file system path-separator character

core-libs/java.util

Priority Bug Summary
P4 JDK-8284866 Add test to JDK-8273056
P4 JDK-8282551 Properly initialize L32X64MixRandom state

core-libs/java.util.jar

Priority Bug Summary
P4 JDK-8278794 Infinite loop in DeflaterOutputStream.finish()

core-libs/java.util:i18n

Priority Bug Summary
P4 JDK-8282887 Potential memory leak in sun.util.locale.provider.HostLocaleProviderAdapterImpl.getNumberPattern() on Windows

core-svc/debugger

Priority Bug Summary
P3 JDK-8281615 Deadlock caused by jdwp agent

docs/guides

Priority Bug Summary
P4 JDK-8286380 Update Troubleshooting Guide/Diagnostic Tools NMT categories for JDK18

docs/hotspot

Priority Bug Summary
P4 JDK-8287883 Incorrect documentation for OutOfMemoryError: Requested array size exceeds VM limit

hotspot/compiler

Priority Bug Summary
P3 JDK-8281266 [JVMCI] MetaUtil.toInternalName() doesn't handle hidden classes correctly
P3 JDK-8279219 [REDO] C2 crash when allocating array of size too large
P3 JDK-8281811 assert(_base == Tuple) failed: Not a Tuple after JDK-8280799
P3 JDK-8281544 assert(VM_Version::supports_avx512bw()) failed for Tests jdk/incubator/vector/
P3 JDK-8256368 Avoid repeated upcalls into Java to re-resolve MH/VH linkers/invokers
P3 JDK-8282874 Bad performance on gather/scatter API caused by different IntSpecies of indexMap
P3 JDK-8275337 C1: assert(false) failed: live_in set of first block must be empty
P3 JDK-8282194 C1: Missing side effects of dynamic constant linkage
P3 JDK-8280600 C2: assert(!had_error) failed: bad dominance
P3 JDK-8283451 C2: assert(_base == Long) failed: Not a Long
P3 JDK-8282590 C2: assert(addp->is_AddP() && addp->outcnt() > 0) failed: Don't process dead nodes
P3 JDK-8282592 C2: assert(false) failed: graph should be schedulable
P3 JDK-8279822 CI: Constant pool entries in error state are not supported
P3 JDK-8280867 Cpuid1Ecx feature parsing is incorrect for AMD CPUs
P3 JDK-8283408 Fix a C2 crash when filling arrays with unsafe
P3 JDK-8283641 Large value for CompileThresholdScaling causes assert
P3 JDK-8280901 MethodHandle::linkToNative stub is missing w/ -Xint
P3 JDK-8282312 Minor corrections to evbroadcasti32x4 intrinsic on x86
P3 JDK-8281822 Test failures on non-DTrace builds due to incomplete DTrace* flags handling
P3 JDK-8282231 x86-32: runtime call to SharedRuntime::ldiv corrupts registers
P3 JDK-8280799 ะก2: assert(false) failed: cyclic dependency prevents range check elimination
P4 JDK-8271008 appcds/*/MethodHandlesAsCollectorTest.java tests time out because of excessive GC (CodeCache GC Threshold) in loom
P4 JDK-8277893 Arraycopy stress tests
P4 JDK-8277055 Assert "missing inlining msg" with -XX:+PrintIntrinsics
P4 JDK-8283187 C2: loop candidate for superword not always unrolled fully if superword fails
P4 JDK-8282172 CompileBroker::log_metaspace_failure is called from non-Java/compiler threads
P4 JDK-8271055 Crash during deoptimization with "assert(bb->is_reachable()) failed: getting result from unreachable basicblock" with -XX:+VerifyStack
P4 JDK-8272493 Suboptimal code generation around Preconditions.checkIndex intrinsic with AVX2
P4 JDK-8284369 TestFailedAllocationBadGraph fails with -XX:TieredStopAtLevel < 4
P4 JDK-8279668 x86: AVX2 versions of vpxor should be asserted
P5 JDK-8282045 When loop strip mining fails, safepoints are removed from loop anyway

hotspot/gc

Priority Bug Summary
P1 JDK-8283555 G1: Concurrent mark accesses uninitialized BOT of closed archive regions

hotspot/jfr

Priority Bug Summary
P4 JDK-8281318 Improve jfr/event/allocation tests reliability
P4 JDK-8281638 jfr/event/allocation tests fail with release VMs after JDK-8281318 due to lack of -XX:+UnlockDiagnosticVMOptions

hotspot/runtime

Priority Bug Summary
P3 JDK-8281274 deal with ActiveProcessorCount in os::Linux::print_container_info
P3 JDK-8281181 Do not use CPU Shares to compute active processor count
P3 JDK-8283379 Memory leak in FileHeaderHelper
P3 JDK-8282295 SymbolPropertyEntry::set_method_type fails with assert
P4 JDK-8278381 [GCC 11] Address::make_raw() does not initialize rspec
P4 JDK-8281771 Crash in java_lang_invoke_MethodType::print_signature

infrastructure/build

Priority Bug Summary
P4 JDK-8282225 GHA: Allow one concurrent run per PR only
P4 JDK-8284507 GHA: Only check test results if testing was not skipped
P4 JDK-8283017 GHA: Workflows break with update release versions
P4 JDK-8284389 Improve stability of GHA Pre-submit testing by caching cygwin installer
P4 JDK-8279958 Provide configure hints for Alpine/apk package managers

infrastructure/release_eng

Priority Bug Summary
P4 JDK-8283037 Update jdk18u fix version to 18.0.2

security-libs/javax.net.ssl

Priority Bug Summary
P2 JDK-8274524 SSLSocket.close() hangs if it is called during the ssl handshake

xml/jaxp

Priority Bug Summary
P4 JDK-8282583 Update BCEL md to include the copyright notice