This is seen in GHA, and reproduces well on my machine as well:

$ CONF=linux-x86_64-server-fastdebug make images test TEST=compiler/c1/TestConcurrentPatching.java
<stuck, timeout>

gdb "thread apply all bt" shows the compiler is idle. Supplying `-XX:-UseLockFreeCompileQueues` makes the test pass. I think there is a bug in UseLockFreeCompileQueues in leyden repo.