The following sub-tests time out in the Valhalla CI:

compiler/valhalla/inlinetypes/TestTearing.java#flattening-di-AII
compiler/valhalla/inlinetypes/TestTearing.java#flattening-di
compiler/valhalla/inlinetypes/TestTearing.java#flattening-AII
compiler/valhalla/inlinetypes/TestTearing.java#flattening

Here's a snippet from the TestTearing.java#flattening-di-AII log file:

#section:main
----------messages:(12/1356)----------
command: main -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI -XX:+UseNullableValueFlattening -XX:+UseAtomicValueFlattening -XX:+UseArrayFlattening -XX:CompileCommand=dontinline,*::incrementAndCheck* -XX:+UnlockDiagnosticVMOptions -XX:+StressGCM -XX:+StressLCM -XX:+IgnoreUnrecognizedVMOptions -XX:+AlwaysIncrementalInline compiler.valhalla.inlinetypes.TestTearing
reason: User specified action: run main/othervm -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI -XX:+UseNullableValueFlattening -XX:+UseAtomicValueFlattening -XX:+UseArrayFlattening -XX:CompileCommand=dontinline,*::incrementAndCheck* -XX:+UnlockDiagnosticVMOptions -XX:+StressGCM -XX:+StressLCM -XX:+IgnoreUnrecognizedVMOptions -XX:+AlwaysIncrementalInline compiler.valhalla.inlinetypes.TestTearing
started: Tue Feb 24 09:09:31.969 GMT 2026
Mode: othervm [/othervm specified]
Additional options from @modules: --add-modules java.base --add-exports java.base/jdk.internal.misc=ALL-UNNAMED --add-exports java.base/jdk.internal.value=ALL-UNNAMED --add-exports java.base/jdk.internal.vm.annotation=ALL-UNNAMED
Process id: 81036
Timeout information:
[09:17:31.989] starting timeout handler action(s)
[09:20:38.116] timeout handler action(s) completed
--- Timeout information end.
finished: Tue Feb 24 09:20:38.122 GMT 2026
elapsed time (seconds): 666.153
----------configuration:(6/257)----------

<snip>

----------System.out:(2/122)----------
CompileCommand: dontinline *.incrementAndCheck* bool dontinline = true
[09:17:31.987] Timeout signalled after 480 seconds
----------System.err:(1/15)----------
STATUS:Passed.
----------rerun:(54/11033)*----------

It appears that the test passed while the timeout handler was running.

I'm starting this bug off as a P2 since we have 4 sightings in a Tier1 job set.