RFR: 8330008: [s390x] Test bit "in-memory" in case of DiagnoseSyncOnValueBasedClasses

[Amit Kumar]

On Wed, 10 Apr 2024 09:58:55 GMT, Amit Kumar <amitkumar at openjdk.org> wrote:

> It's trivial update to use `testbit` method to test the bit "in-memory"

I have done testing with `DiagnoseSyncOnValueBasedClasses=1`.

This test failure I got, but it's failing on master branch as well if we are using same argument:

STDOUT:
#
# A fatal error has been detected by the Java Runtime Environment:
#
#  Internal Error (/home/amit/mr/jdk/src/hotspot/share/runtime/synchronizer.cpp:485), pid=3628970, tid=3628992
#  fatal error: Synchronizing on object 0x00000000ffe583c8 of klass java.lang.Integer at SplitIfSharedFastLockBehindCastPP.test2(SplitIfSharedFastLockBehindCastPP.java:92)
#
# JRE version: OpenJDK Runtime Environment (23.0) (fastdebug build 23-internal-adhoc.amit.jdk)
# Java VM: OpenJDK 64-Bit Server VM (fastdebug 23-internal-adhoc.amit.jdk, mixed mode, sharing, compressed oops, compressed class ptrs, g1 gc, linux-s390x)
# Problematic frame:
# V  [libjvm.so+0x12b4b8c]  ObjectSynchronizer::handle_sync_on_value_based_class(Handle, JavaThread*)+0x944
#
# Core dump will be written. Default location: Core dumps may be processed with "/usr/share/apport/apport -p%p -s%s -c%c -d%d -P%P -u%u -g%g -- %E" (or dumping to /home/amit/mr/jdk/build/linux-s390x-server-fastdebug/test-support/jtreg_test_hotspot_jtreg_compiler_loopopts_SplitIfSharedFastLockBehindCastPP_java/scratch/0/core.3628970)
#
# An error report file with more information is saved as:
# /home/amit/mr/jdk/build/linux-s390x-server-fastdebug/test-support/jtreg_test_hotspot_jtreg_compiler_loopopts_SplitIfSharedFastLockBehindCastPP_java/scratch/0/hs_err_pid3628970.log
#
# If you would like to submit a bug report, please visit:
#   https://bugreport.java.com/bugreport/crash.jsp
#

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PR Comment: https://git.openjdk.org/jdk/pull/18709#issuecomment-2063072273