The following test timed out in the JDK23 CI:

compiler/vectorapi/VectorRebracket128Test.java#ZSinglegen

Here's a snippet from the log file:

#section:testng
----------messages:(9/797)----------
command: testng -XX:CompileCommand=compileonly,jdk/incubator/vector/ByteVector.fromMemorySegment -XX:-TieredCompilation -XX:CICompilerCount=1 -XX:+UseZGC -XX:-ZGenerational -Xbatch -Xmx256m VectorRebracket128Test
reason: User specified action: run testng/othervm -XX:CompileCommand=compileonly,jdk/incubator/vector/ByteVector.fromMemorySegment -XX:-TieredCompilation -XX:CICompilerCount=1 -XX:+UseZGC -XX:-ZGenerational -Xbatch -Xmx256m VectorRebracket128Test
started: Wed Apr 17 20:15:14 UTC 2024
Mode: othervm [/othervm specified]
Additional options from @modules: --add-modules jdk.incubator.vector,java.base --add-exports java.base/jdk.internal.vm.annotation=ALL-UNNAMED
Timeout information:
--- Timeout information end.
finished: Wed Apr 17 20:36:46 UTC 2024
elapsed time (seconds): 1292.34
----------configuration:(4/129)----------
Boot Layer
  add modules: jdk.incubator.vector java.base
  add exports: java.base/jdk.internal.vm.annotation ALL-UNNAMED

----------System.out:(2/139)----------
CompileCommand: compileonly jdk/incubator/vector/ByteVector.fromMemorySegment bool compileonly = true
Timeout signalled after 1200 seconds
----------System.err:(1/55)----------
WARNING: Using incubator modules: jdk.incubator.vector
----------rerun:(53/7459)*----------

<snip>

result: Error. Program `/opt/mach5/mesos/work_dir/jib-master/install/jdk-23+19-1532/linux-aarch64-debug.jdk/jdk-23/fastdebug/bin/java' timed out (timeout set to 1200000ms, elapsed time including timeout handling was 1292328ms).