The following tests crashed in the Valhalla CI with the --enable-preview option:

jdk/jfr/event/oldobject/TestReferenceChainLimit.java
jdk/jfr/event/oldobject/TestLargeRootSet.java
jdk/jfr/event/oldobject/TestHeapDeep.java

Here's a snippet from the TestReferenceChainLimit.java log file:

#section:main
----------messages:(8/473)----------
command: main -XX:TLABSize=2k jdk.jfr.event.oldobject.TestReferenceChainLimit
reason: User specified action: run main/othervm -XX:TLABSize=2k jdk.jfr.event.oldobject.TestReferenceChainLimit
started: Thu Jan 08 00:36:18.603 GMT 2026
Mode: othervm [/othervm specified]
Additional options from @modules: --add-modules jdk.jfr --add-exports jdk.jfr/jdk.jfr.internal.test=ALL-UNNAMED
Process id: 52689
finished: Thu Jan 08 00:38:52.828 GMT 2026
elapsed time (seconds): 154.225
----------configuration:(4/115)----------
Boot Layer
  add modules: jdk.jfr
  add exports: jdk.jfr/jdk.jfr.internal.test ALL-UNNAMED

----------System.out:(17/1634)----------
#
# A fatal error has been detected by the Java Runtime Environment:
#
# Internal Error (/System/Volumes/Data/mesos/work_dir/slaves/da1065b5-7b94-4f0d-85e9-a3a252b9a32e-S47240/frameworks/1735e8a2-a1db-478c-8104-60c8b0af87dd-0196/executors/4dc375b5-0100-46ae-b1b4-4d631fe9325b/runs/facfb9c2-f4d4-436d-b35b-6dead39aed31/workspace/open/src/hotspot/share/jfr/leakprofiler/checkpoint/eventEmitter.cpp:141), pid=52689, tid=19715
# assert(edge->pointee() == sample->object()) failed: invariant
#
# JRE version: Java(TM) SE Runtime Environment (27.0+1) (fastdebug build 27-valhalla+1-20)
# Java VM: Java HotSpot(TM) 64-Bit Server VM (fastdebug 27-valhalla+1-20, mixed mode, sharing, tiered, compressed oops, compressed class ptrs, g1 gc, bsd-aarch64)
# Core dump will be written. Default location: core.52689
#
# JFR recording file will be written. Location: /System/Volumes/Data/mesos/work_dir/slaves/da1065b5-7b94-4f0d-85e9-a3a252b9a32e-S43554/frameworks/1735e8a2-a1db-478c-8104-60c8b0af87dd-0196/executors/c41a313d-0f5d-4eee-9758-cafee1b1c3c8/runs/089ced67-c09d-4c93-b710-089b5ddb8e1a/testoutput/test-support/jtreg_open_test_jdk_tier3_part1/scratch/3/hs_err_pid52689.jfr
#
# An error report file with more information is saved as:
# /System/Volumes/Data/mesos/work_dir/slaves/da1065b5-7b94-4f0d-85e9-a3a252b9a32e-S43554/frameworks/1735e8a2-a1db-478c-8104-60c8b0af87dd-0196/executors/c41a313d-0f5d-4eee-9758-cafee1b1c3c8/runs/089ced67-c09d-4c93-b710-089b5ddb8e1a/testoutput/test-support/jtreg_open_test_jdk_tier3_part1/scratch/3/hs_err_pid52689.log

------ Timeout during error reporting after 120 s. ------
# [ timer expired, abort... ]
----------System.err:(0/0)----------
----------rerun:(43/9333)*----------

Here's the crashing stack for TestReferenceChainLimit.java:

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

Current thread (0x0000000154009a10): VMThread "VM Thread" [id=19715, stack(0x0000000170cdc000,0x0000000170edf000) (2060K)]

Stack: [0x0000000170cdc000,0x0000000170edf000], sp=0x0000000170ede420, free space=2057k
Native frames: (J=compiled Java code, j=interpreted, Vv=VM code, C=native code)
V [libjvm.dylib+0x1375214] VMError::report(outputStream*, bool)+0x1b70 (eventEmitter.cpp:141)
V [libjvm.dylib+0x1378b18] VMError::report_and_die(int, char const*, char const*, char*, Thread*, unsigned char*, void const*, void const*, char const*, int, unsigned long)+0x55c
V [libjvm.dylib+0x625550] print_error_for_unit_test(char const*, char const*, char*)+0x0
V [libjvm.dylib+0x718850] EventEmitter::write_event(ObjectSample const*, EdgeStore*)+0x4c0
V [libjvm.dylib+0x7180e8] EventEmitter::write_events(ObjectSampler*, EdgeStore*, bool)+0x16c
V [libjvm.dylib+0x100cc18] PathToGcRootsOperation::doit()+0x2c4
V [libjvm.dylib+0x1380be8] VM_Operation::evaluate()+0x11c
V [libjvm.dylib+0x1395c04] VMThread::evaluate_operation(VM_Operation*)+0x13c
V [libjvm.dylib+0x13966d4] VMThread::inner_execute(VM_Operation*)+0x320
V [libjvm.dylib+0x13958b8] VMThread::loop()+0x98
V [libjvm.dylib+0x1395644] VMThread::run()+0xc0
V [libjvm.dylib+0x12a7180] Thread::call_run()+0xf0
V [libjvm.dylib+0xfb89e8] thread_native_entry(Thread*)+0x138
C [libsystem_pthread.dylib+0x6bc8] _pthread_start+0x88
VM_Operation (0x00000001727f9e60): JFROldObject, mode: safepoint, requested by thread 0x000000015403a610

Here's a snippet from the TestLargeRootSet.java log file:

#section:main
----------messages:(8/459)----------
command: main -XX:TLABSize=2k jdk.jfr.event.oldobject.TestLargeRootSet
reason: User specified action: run main/othervm -XX:TLABSize=2k jdk.jfr.event.oldobject.TestLargeRootSet
started: Thu Jan 08 00:36:09.248 GMT 2026
Mode: othervm [/othervm specified]
Additional options from @modules: --add-modules jdk.jfr --add-exports jdk.jfr/jdk.jfr.internal.test=ALL-UNNAMED
Process id: 52676
finished: Thu Jan 08 00:38:53.631 GMT 2026
elapsed time (seconds): 164.383
----------configuration:(4/115)----------
Boot Layer
  add modules: jdk.jfr
  add exports: jdk.jfr/jdk.jfr.internal.test ALL-UNNAMED

----------System.out:(17/1622)----------
#
# A fatal error has been detected by the Java Runtime Environment:
#
# Internal Error (/System/Volumes/Data/mesos/work_dir/slaves/da1065b5-7b94-4f0d-85e9-a3a252b9a32e-S47240/frameworks/1735e8a2-a1db-478c-8104-60c8b0af87dd-0196/executors/4dc375b5-0100-46ae-b1b4-4d631fe9325b/runs/facfb9c2-f4d4-436d-b35b-6dead39aed31/workspace/open/src/hotspot/share/jfr/leakprofiler/chains/edgeStore.cpp:241), pid=52676, tid=18691
# assert(_leak_context_edges != nullptr) failed: invariant
#
# JRE version: Java(TM) SE Runtime Environment (27.0+1) (fastdebug build 27-valhalla+1-20)
# Java VM: Java HotSpot(TM) 64-Bit Server VM (fastdebug 27-valhalla+1-20, mixed mode, sharing, tiered, compressed oops, compressed class ptrs, g1 gc, bsd-aarch64)
# Core dump will be written. Default location: core.52676
#
# JFR recording file will be written. Location: /System/Volumes/Data/mesos/work_dir/slaves/da1065b5-7b94-4f0d-85e9-a3a252b9a32e-S43554/frameworks/1735e8a2-a1db-478c-8104-60c8b0af87dd-0196/executors/c41a313d-0f5d-4eee-9758-cafee1b1c3c8/runs/089ced67-c09d-4c93-b710-089b5ddb8e1a/testoutput/test-support/jtreg_open_test_jdk_tier3_part1/scratch/0/hs_err_pid52676.jfr
#
# An error report file with more information is saved as:
# /System/Volumes/Data/mesos/work_dir/slaves/da1065b5-7b94-4f0d-85e9-a3a252b9a32e-S43554/frameworks/1735e8a2-a1db-478c-8104-60c8b0af87dd-0196/executors/c41a313d-0f5d-4eee-9758-cafee1b1c3c8/runs/089ced67-c09d-4c93-b710-089b5ddb8e1a/testoutput/test-support/jtreg_open_test_jdk_tier3_part1/scratch/0/hs_err_pid52676.log

------ Timeout during error reporting after 120 s. ------
# [ timer expired, abort... ]
----------System.err:(0/0)----------
----------rerun:(43/9235)*----------

Here's the crashing stack from TestLargeRootSet.java:

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

Current thread (0x000000013b817010): VMThread "VM Thread" [id=18691, stack(0x0000000170cf0000,0x0000000170ef3000) (2060K)]

Stack: [0x0000000170cf0000,0x0000000170ef3000], sp=0x0000000170ef24a0, free space=2057k
Native frames: (J=compiled Java code, j=interpreted, Vv=VM code, C=native code)
V [libjvm.dylib+0x1375214] VMError::report(outputStream*, bool)+0x1b70 (edgeStore.cpp:241)
V [libjvm.dylib+0x1378b18] VMError::report_and_die(int, char const*, char const*, char*, Thread*, unsigned char*, void const*, void const*, char const*, int, unsigned long)+0x55c
V [libjvm.dylib+0x625550] print_error_for_unit_test(char const*, char const*, char*)+0x0
V [libjvm.dylib+0x6f2008] EdgeStore::has_leak_context(ObjectSample const*) const+0x13c
V [libjvm.dylib+0x71823c] EventEmitter::link_sample_with_edge(ObjectSample const*, EdgeStore*)+0x74
V [libjvm.dylib+0x71806c] EventEmitter::write_events(ObjectSampler*, EdgeStore*, bool)+0xf0
V [libjvm.dylib+0x100cc18] PathToGcRootsOperation::doit()+0x2c4
V [libjvm.dylib+0x1380be8] VM_Operation::evaluate()+0x11c
V [libjvm.dylib+0x1395c04] VMThread::evaluate_operation(VM_Operation*)+0x13c
V [libjvm.dylib+0x13966d4] VMThread::inner_execute(VM_Operation*)+0x320
V [libjvm.dylib+0x13958b8] VMThread::loop()+0x98
V [libjvm.dylib+0x1395644] VMThread::run()+0xc0
V [libjvm.dylib+0x12a7180] Thread::call_run()+0xf0
V [libjvm.dylib+0xfb89e8] thread_native_entry(Thread*)+0x138
C [libsystem_pthread.dylib+0x6bc8] _pthread_start+0x88
VM_Operation (0x000000017280df50): JFROldObject, mode: safepoint, requested by thread 0x000000013b832410

Here's a snippet from the TestHeapDeep.java log file:

#section:main
----------messages:(8/450)----------
command: main -XX:TLABSize=2k jdk.jfr.event.oldobject.TestHeapDeep
reason: User specified action: run main/othervm -XX:TLABSize=2k jdk.jfr.event.oldobject.TestHeapDeep
started: Thu Jan 08 00:36:08.388 GMT 2026
Mode: othervm [/othervm specified]
Additional options from @modules: --add-modules jdk.jfr --add-exports jdk.jfr/jdk.jfr.internal.test=ALL-UNNAMED
Process id: 52674
finished: Thu Jan 08 00:38:52.828 GMT 2026
elapsed time (seconds): 164.44
----------configuration:(4/115)----------
Boot Layer
  add modules: jdk.jfr
  add exports: jdk.jfr/jdk.jfr.internal.test ALL-UNNAMED

----------System.out:(17/1634)----------
#
# A fatal error has been detected by the Java Runtime Environment:
#
# Internal Error (/System/Volumes/Data/mesos/work_dir/slaves/da1065b5-7b94-4f0d-85e9-a3a252b9a32e-S47240/frameworks/1735e8a2-a1db-478c-8104-60c8b0af87dd-0196/executors/4dc375b5-0100-46ae-b1b4-4d631fe9325b/runs/facfb9c2-f4d4-436d-b35b-6dead39aed31/workspace/open/src/hotspot/share/jfr/leakprofiler/checkpoint/eventEmitter.cpp:141), pid=52674, tid=18691
# assert(edge->pointee() == sample->object()) failed: invariant
#
# JRE version: Java(TM) SE Runtime Environment (27.0+1) (fastdebug build 27-valhalla+1-20)
# Java VM: Java HotSpot(TM) 64-Bit Server VM (fastdebug 27-valhalla+1-20, mixed mode, sharing, tiered, compressed oops, compressed class ptrs, g1 gc, bsd-aarch64)
# Core dump will be written. Default location: core.52674
#
# JFR recording file will be written. Location: /System/Volumes/Data/mesos/work_dir/slaves/da1065b5-7b94-4f0d-85e9-a3a252b9a32e-S43554/frameworks/1735e8a2-a1db-478c-8104-60c8b0af87dd-0196/executors/c41a313d-0f5d-4eee-9758-cafee1b1c3c8/runs/089ced67-c09d-4c93-b710-089b5ddb8e1a/testoutput/test-support/jtreg_open_test_jdk_tier3_part1/scratch/1/hs_err_pid52674.jfr
#
# An error report file with more information is saved as:
# /System/Volumes/Data/mesos/work_dir/slaves/da1065b5-7b94-4f0d-85e9-a3a252b9a32e-S43554/frameworks/1735e8a2-a1db-478c-8104-60c8b0af87dd-0196/executors/c41a313d-0f5d-4eee-9758-cafee1b1c3c8/runs/089ced67-c09d-4c93-b710-089b5ddb8e1a/testoutput/test-support/jtreg_open_test_jdk_tier3_part1/scratch/1/hs_err_pid52674.log

------ Timeout during error reporting after 120 s. ------
# [ timer expired, abort... ]
----------System.err:(0/0)----------
----------rerun:(43/9179)*----------

Here's the crashing stack from TestHeapDeep.java:

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

Current thread (0x000000013e819e10): VMThread "VM Thread" [id=18691, stack(0x000000016c974000,0x000000016cb77000) (2060K)]

Stack: [0x000000016c974000,0x000000016cb77000], sp=0x000000016cb76420, free space=2057k
Native frames: (J=compiled Java code, j=interpreted, Vv=VM code, C=native code)
V [libjvm.dylib+0x1375214] VMError::report(outputStream*, bool)+0x1b70 (eventEmitter.cpp:141)
V [libjvm.dylib+0x1378b18] VMError::report_and_die(int, char const*, char const*, char*, Thread*, unsigned char*, void const*, void const*, char const*, int, unsigned long)+0x55c
V [libjvm.dylib+0x625550] print_error_for_unit_test(char const*, char const*, char*)+0x0
V [libjvm.dylib+0x718850] EventEmitter::write_event(ObjectSample const*, EdgeStore*)+0x4c0
V [libjvm.dylib+0x7180e8] EventEmitter::write_events(ObjectSampler*, EdgeStore*, bool)+0x16c
V [libjvm.dylib+0x100cc18] PathToGcRootsOperation::doit()+0x2c4
V [libjvm.dylib+0x1380be8] VM_Operation::evaluate()+0x11c
V [libjvm.dylib+0x1395c04] VMThread::evaluate_operation(VM_Operation*)+0x13c
V [libjvm.dylib+0x13966d4] VMThread::inner_execute(VM_Operation*)+0x320
V [libjvm.dylib+0x13958b8] VMThread::loop()+0x98
V [libjvm.dylib+0x1395644] VMThread::run()+0xc0
V [libjvm.dylib+0x12a7180] Thread::call_run()+0xf0
V [libjvm.dylib+0xfb89e8] thread_native_entry(Thread*)+0x138
C [libsystem_pthread.dylib+0x6bc8] _pthread_start+0x88
VM_Operation (0x000000016e491e60): JFROldObject, mode: safepoint, requested by thread 0x000000012d823610