Strange failure. In the log we see:

reason: Named class compiled on demand
started: Tue Sep 30 10:19:52 BST 2025
Test directory:
  compile: compiler.codecache.jmx.UsageThresholdExceededTest
finished: Tue Sep 30 10:22:52 BST 2025
elapsed time (seconds): 180.197
result: Error. Agent communication error: java.net.SocketTimeoutException: Read timed out; check console log for any additional details

but later:

[thread 43267 also had an error]
result: Error. Agent communication error: java.net.SocketTimeoutException: Read timed out; check console log for any additional details

The "thread NNN also had an error" is something we normally see during hs_err file creation, but there is no hs_err file here and no sign of any crash.

Filing for tracking/linking purposes but this seems some kind of infra glitchj.