The following two tests timed out with slowdebug bits with
stress testing:

vmTestbase/nsk/monitoring/stress/thread/cmon002/TestDescription.java
vmTestbase/nsk/monitoring/stress/thread/cmon003/TestDescription.java

Here's my tracking entries:

+# jdk-21+9_1_linux - observed in jdk-21+9 testing on 2023.02.09 on
+# linux-x64 in slowdebug config:
+# - elapsed time (seconds): 124.115
+# jdk-21+9_2_linux - observed in jdk-21+9 testing on 2023.02.10 on
+# linux-x64 in slowdebug config:
+# - elapsed time (seconds): 123.998
+# jdk-21+9_3_linux - observed in jdk-21+9 testing on 2023.02.11 on
+# linux-x64 in slowdebug config:
+# - elapsed time (seconds): 123.886
+#ZZZ vmTestbase/nsk/monitoring/stress/thread/cmon002/TestDescription.java XXXXXXX linux-x64
+
+# jdk-21+9_1_linux - observed in jdk-21+9 testing on 2023.02.09 on
+# linux-x64 in slowdebug config:
+# - elapsed time (seconds): 124.14
+# jdk-21+9_2_linux - observed in jdk-21+9 testing on 2023.02.10 on
+# linux-x64 in slowdebug config:
+# - elapsed time (seconds): 124.059
+# jdk-21+9_3_linux - observed in jdk-21+9 testing on 2023.02.11 on
+# linux-x64 in slowdebug config:
+# - elapsed time (seconds): 123.921
+#ZZZ vmTestbase/nsk/monitoring/stress/thread/cmon003/TestDescription.java 8209849 linux-x64

8209849 is closed bug associated with a Solaris timeout sighting from a long time ago.
I'll be updating the entry to this bug ID.