ScalarR not stopping

Hi, I observe the following in the output of the rumble client

Fighting battle 44 ... aaa.r.ScalarR 0.005h.053,jk.mega.DrussGT 3.1.7
Robot aaa.r.ScalarR 0.005h.053 (1) is not stopping.  Forcing a stop.
Robot aaa.r.ScalarR 0.005h.053 (1) is not stopping.  Forcing a stop.
Unable to stop thread: aaa.r.ScalarR 0.005h.053 (1)
Unable to stop thread: aaa.r.ScalarR 0.005h.053 (1)

and the client seems to be running this battle with 100% CPU for at least several minutes (about 5). Then roborumble continued.

I am not sure where to search for the problem but there is something strange going on. I am running everything with

openjdk version "11.0.16" 2022-07-19
OpenJDK Runtime Environment (build 11.0.16+8-post-Debian-1deb11u1)
OpenJDK 64-Bit Server VM (build 11.0.16+8-post-Debian-1deb11u1, mixed mode, sharing)

What is HotSpot?

Could it be Kotlin related? My roborumble (official one) clients report this error at the startup time

java.lang.IllegalAccessError: class kotlin.collections.CollectionsKt cannot access its superclass kotlin.collections.CollectionsKt___CollectionsKt (kotlin.collections.CollectionsKt is in unnamed module of loader net.sf.robocode.host.security.RobotClassLoader @586bc8ed; kotlin.collections.CollectionsKt___CollectionsKt is in unnamed module of loader java.net.URLClassLoader @3d494fbf)

I don't think it has something to do with Kotlin, but I generally delete Kotlin jars to suppress this error.

I had a check at the round finalization logic of robocode, it seems that after user specified run() exits, control flow will be handled to `HostingRobotProxy.run`, which calls `BasicRobotProxy.waitForBattleEndImpl`. The logic here had some potential bugs, e.g. when receiving `InterruptedException`, it merely wakes up the thread instead of letting the thread exit gracefully. Not sure what triggered a bug here on some platform though...