The following test has been timing out with slowdebug bits during
my stress testing runs:

compiler/jsr292/ContinuousCallSiteTargetChange.java

Here's my notes for the failures so far:

# jdk-21+9_1_linux - observed in jdk-21+9 testing on 2023.02.09 on
+# linux-x64 in slowdebug config:
+#   - elapsed time (seconds): 1444.518
+#   - Agent 191 timed out with a timeout of 1440 seconds
+# jdk-21+9_2_linux - observed in jdk-21+9 testing on 2023.02.10 on
+# linux-x64 in slowdebug config:
+#   - elapsed time (seconds): 1443.453
+#   - Agent 235 timed out with a timeout of 1440 seconds
+# jdk-21+9_3_linux - observed in jdk-21+9 testing on 2023.02.11 on
+# linux-x64 in slowdebug config:
+#   - elapsed time (seconds): 1443.467
+#   - Agent 217 timed out with a timeout of 1440 seconds
+# jdk-21+9_1_macosx-aarch64 - observed in jdk-21+9 testing on 2023.02.10 on
+# macosx-aarch64 in slowdebug config:
+#   - elapsed time (seconds): 1445.244
+#   - Agent 184 timed out with a timeout of 1440 seconds
+# jdk-21+9_2_macosx-aarch64 - observed in jdk-21+9 testing on 2023.02.11 on
+# macosx-aarch64 in slowdebug config:
+#   - elapsed time (seconds): 1441.418
+#   - Agent 166 timed out with a timeout of 1440 seconds
+# jdk-21+9_3_macosx-aarch64 - observed in jdk-21+9 testing on 2023.02.12 on
+# macosx-aarch64 in slowdebug config:
+#   - elapsed time (seconds): 1446.475
+#   - Agent 168 timed out with a timeout of 1440 seconds


So this test has been timing out with slowdebug bits on both linux-x64
and macosx-aarch64; both release and fastdebug bits do not timeout.
So far the test has timed out at the full timeout value (default timeout
of 2 minutes X slowdebug timeout factor of 12) => 24 minutes. So far
the test has not passed while the timeout handler was running.

These slowdebug timeouts did not happen with jdk-20+34 stress testing
and jdk-21+9 is my first stress testing run for the jdk-21 release.