The following test failed in the Valhalla CI:

serviceability/sa/TestJhsdbJstackMixedWithXComp.java#xcomp

Here's a snippet from the log file:

#section:driver
----------messages:(8/282)----------
command: driver TestJhsdbJstackMixedWithXComp
reason: User specified action: run driver TestJhsdbJstackMixedWithXComp
started: Sun Mar 01 15:30:13.237 UTC 2026
Mode: agentvm
Agent id: 68
Process id: 2452919
finished: Sun Mar 01 15:31:33.291 UTC 2026
elapsed time (seconds): 80.054
----------configuration:(14/2017)----------

<snip>

----------stderr:(5/753)----------
WARNING: A restricted method in java.lang.foreign.Linker has been called
WARNING: java.lang.foreign.Linker::downcallHandle has been called by LingeredAppWithVirtualThread in an unnamed module (file:/opt/mach5/mesos/work_dir/slaves/da1065b5-7b94-4f0d-85e9-a3a252b9a32e-S98639/frameworks/1735e8a2-a1db-478c-8104-60c8b0af87dd-0196/executors/9371bc7d-3ab3-4b04-8797-7efdec00d82d/runs/e4236ace-2f21-4226-8068-e59d5f6d61ad/testoutput/test-support/jtreg_open_test_hotspot_jtreg_hotspot_serviceability/classes/3/serviceability/sa/TestJhsdbJstackMixedWithXComp_xcomp.d/)
WARNING: Use --enable-native-access=ALL-UNNAMED to avoid a warning for callers in this module
WARNING: Restricted methods will be blocked in a future release unless native access is enabled

----------System.out:(413/27942)----------
Command line: ['/opt/mach5/mesos/work_dir/jib-master/install/jdk-27-valhalla+1-185/linux-x64-debug.jdk/jdk-27/fastdebug/bin/java' '-XX:MaxRAMPercentage=4.16667' '-Dtest.boot.jdk=/opt/mach5/mesos/work_dir/jib-master/install/jdk/25/37/bundles/linux-x64/jdk-25_linux-x64_bin.tar.gz/jdk-25' '-Djava.io.tmpdir=/opt/mach5/mesos/work_dir/slaves/da1065b5-7b94-4f0d-85e9-a3a252b9a32e-S98639/frameworks/1735e8a2-a1db-478c-8104-60c8b0af87dd-0196/executors/9371bc7d-3ab3-4b04-8797-7efdec00d82d/runs/e4236ace-2f21-4226-8068-e59d5f6d61ad/testoutput/test-support/jtreg_open_test_hotspot_jtreg_hotspot_serviceability/tmp' '-Xcomp' '-ea' '-esa' '-XX:CompileThreshold=100' '-XX:+UnlockExperimentalVMOptions' '-server' '-XX:+TieredCompilation' '-XX:+DeoptimizeALot' '-Xcomp' '-cp' '/opt/mach5/mesos/work_dir/slaves/da1065b5-7b94-4f0d-85e9-a3a252b9a32e-S98639/frameworks/1735e8a2-a1db-478c-8104-60c8b0af87dd-0196/executors/9371bc7d-3ab3-4b04-8797-7efdec00d82d/runs/e4236ace-2f21-4226-8068-e59d5f6d61ad/testoutput/test-support/jtreg_open_test_hotspot_jtreg_hotspot_serviceability/classes/3/serviceability/sa/TestJhsdbJstackMixedWithXComp_xcomp.d:/opt/mach5/mesos/work_dir/slaves/da1065b5-7b94-4f0d-85e9-a3a252b9a32e-S98639/frameworks/1735e8a2-a1db-478c-8104-60c8b0af87dd-0196/executors/9371bc7d-3ab3-4b04-8797-7efdec00d82d/runs/e4236ace-2f21-4226-8068-e59d5f6d61ad/testoutput/test-support/jtreg_open_test_hotspot_jtreg_hotspot_serviceability/classes/3/serviceability/sa/TestJhsdbJstackMixedWithXComp_xcomp.d/test/lib' 'LingeredAppWithVirtualThread' '13a50612-5af9-4f15-92e0-1fa930280480.lck']
LingeredApp startup took 33107ms
Check for hs_err_pid/core/mdmp files:
None.
Started LingeredApp with pid 2452975
[2026-03-01T15:30:47.442320Z] Gathering output for process 2453405
Attaching to process ID 2452975, please wait...
Debugger attached successfully.
Server compiler detected.
JVM version is 27-valhalla+1-185
Deadlock Detection:

No deadlocks found.

<snip>

The really LONG part of the log file is added in a separate comment.