The following test timed out in the JDK18 CI:

gc/stress/gcold/TestGCOldWithZ.java

Here's a snippet from the log file:

#section:main
----------messages:(6/319)----------
command: main -Xmx384M -XX:+UseZGC gc.stress.gcold.TestGCOldWithZ 50 1 20 10 10000
reason: User specified action: run main/othervm -Xmx384M -XX:+UseZGC gc.stress.gcold.TestGCOldWithZ 50 1 20 10 10000
Mode: othervm [/othervm specified]
Timeout information:
--- Timeout information end.
elapsed time (seconds): 1438.091
----------configuration:(0/0)----------
----------System.out:(8/310)----------
For random generator using seed: -2834013156008737740
To re-run test with same seed value please add "-Djdk.test.lib.random.seed=-2834013156008737740" to command line.
50 megabytes of live storage
1 work units per step
promotion ratio is 1:20
pointer mutation rate is 10
10000 steps
Timeout refired 1200 times
----------System.err:(4/86)----------
Allocating 152 trees.
  (49804320 bytes)
  (2490216 nodes)
Initialization complete...
----------rerun:(45/8187)*----------

<snip>
result: Error. Program `/opt/mach5/mesos/work_dir/jib-master/install/jdk-18+14-692/linux-x64-debug.jdk/jdk-18/fastdebug/bin/java' timed out (timeout set to 1200000ms, elapsed time including timeout handling was 1438078ms).