The following test failed in the JDK24 CI:

gc/logging/TestUnifiedLoggingSwitchStress.java

Here's a snippet from the log file:

#section:main
----------messages:(7/460)----------
command: main -Xmx256M -Xms256M gc.logging.TestUnifiedLoggingSwitchStress 60
reason: User specified action: run main/othervm -Xmx256M -Xms256M gc.logging.TestUnifiedLoggingSwitchStress 60
started: Sat Jul 27 07:53:00 GMT 2024
Mode: othervm [/othervm specified]
Additional options from @modules: --add-modules java.management,java.base --add-exports java.base/jdk.internal.misc=ALL-UNNAMED
finished: Sat Jul 27 07:54:08 GMT 2024
elapsed time (seconds): 67.812
----------configuration:(4/111)----------
Boot Layer
  add modules: java.management java.base
  add exports: java.base/jdk.internal.misc ALL-UNNAMED

----------System.out:(18/1461)----------
For random generator using seed: -1064950552154265512
To re-run test with same seed value please add "-Djdk.test.lib.random.seed=-1064950552154265512" to command line.
#
# A fatal error has been detected by the Java Runtime Environment:
#
# Internal Error (/System/Volumes/Data/mesos/work_dir/slaves/a4a7850a-7c35-410a-b879-d77fbb2f6087-S147109/frameworks/1735e8a2-a1db-478c-8104-60c8b0af87dd-0196/executors/f5c15147-51e8-43fc-912e-ee802aeaf487/runs/4d94d6ec-f710-4a6b-8bec-2827077c637f/workspace/open/src/hotspot/share/oops/compressedKlass.inline.hpp:46), pid=95174, tid=43011
# assert(check_alignment(result)) failed: address not aligned: 0x00000ff8baadbabe
#
# JRE version: Java(TM) SE Runtime Environment (24.0+8) (fastdebug build 24-ea+8-851)
# Java VM: Java HotSpot(TM) 64-Bit Server VM (fastdebug 24-ea+8-851, compiled mode, sharing, compressed oops, compressed class ptrs, g1 gc, bsd-aarch64)
# Core dump will be written. Default location: core.95174
#
# An error report file with more information is saved as:
# /System/Volumes/Data/mesos/work_dir/slaves/a4a7850a-7c35-410a-b879-d77fbb2f6087-S147458/frameworks/1735e8a2-a1db-478c-8104-60c8b0af87dd-0196/executors/66e9e5ab-8e2e-488c-9c67-248c5738107f/runs/31f0bc1e-22d9-4635-9ead-0aec786ead7d/testoutput/test-support/jtreg_open_test_hotspot_jtreg_hotspot_gc/scratch/3/hs_err_pid95174.log
#
# If you would like to submit a bug report, please visit:
# https://bugreport.java.com/bugreport/crash.jsp
#
----------System.err:(0/0)----------
----------rerun:(47/9030)*----------

Here's the crashing thread's stack:

--------------- T H R E A D ---------------

Current thread (0x000000015901b010): WorkerThread "G1 Conc#1" [id=43011, stack(0x0000000300210000,0x0000000300413000) (2060K)]

Stack: [0x0000000300210000,0x0000000300413000], sp=0x0000000300412a50, free space=2058k
Native frames: (J=compiled Java code, j=interpreted, Vv=VM code, C=native code)
V [libjvm.dylib+0x112f884] VMError::report_and_die(int, char const*, char const*, char*, Thread*, unsigned char*, void*, void*, char const*, int, unsigned long)+0x544 (compressedKlass.inline.hpp:46)
V [libjvm.dylib+0x1130034] VMError::report_and_die(Thread*, unsigned int, unsigned char*, void*, void*)+0x0
V [libjvm.dylib+0x54d450] print_error_for_unit_test(char const*, char const*, char*)+0x0
V [libjvm.dylib+0x6ad578] G1RebuildRSAndScrubTask::G1RebuildRSAndScrubRegionClosure::scan_large_object(G1HeapRegion*, oop, MemRegion)+0x0
V [libjvm.dylib+0x6acf70] G1RebuildRSAndScrubTask::G1RebuildRSAndScrubRegionClosure::scan_and_scrub_region(G1HeapRegion*, HeapWordImpl**)+0x1d8
V [libjvm.dylib+0x6ac7d0] G1RebuildRSAndScrubTask::G1RebuildRSAndScrubRegionClosure::do_heap_region(G1HeapRegion*)+0x144
V [libjvm.dylib+0x6fec04] G1HeapRegionManager::par_iterate(G1HeapRegionClosure*, G1HeapRegionClaimer*, unsigned int) const+0x104
V [libjvm.dylib+0x6ac608] G1RebuildRSAndScrubTask::work(unsigned int)+0x104
V [libjvm.dylib+0x11a9514] WorkerThread::run()+0x94
V [libjvm.dylib+0x106fd60] Thread::call_run()+0xf4
V [libjvm.dylib+0xe1a654] thread_native_entry(Thread*)+0x138
C [libsystem_pthread.dylib+0x6f94] _pthread_start+0x88