Sometimes the exception is thrown on checkpoint:

/jdk/bin/jcmd 221 JDK.checkpoint
Oct 06, 2025 3:28:52 PM jdk.internal.crac.LoggerContainer info
INFO: Starting checkpoint
Oct 06, 2025 3:28:54 PM jdk.internal.crac.LoggerContainer info
Exception in thread "Thread-30" java.nio.channels.ClosedSelectorException
        at java.base/sun.nio.ch.SelectorImpl.ensureOpen(SelectorImpl.java:81)
        at java.base/sun.nio.ch.SelectorImpl.lockAndDoSelect(SelectorImpl.java:124)
        at java.base/sun.nio.ch.SelectorImpl.select(SelectorImpl.java:142)
        at java.base/sun.nio.ch.EPollSelectorImpl$MoveToCheckpointThread.run(EPollSelectorImpl.java:97)