ConcurrentModificationException during HSM-Cleaner run

[kofemann]

dCache version: 11.1.6

10 Feb 2026 07:36:24 [Request tracker timeout] [] Timeout deleting files on HSM tsm via pool dcache-xxx-08
10 Feb 2026 07:36:24 [Request tracker timeout] [] Uncaught exception in thread Request tracker timeout
java.util.ConcurrentModificationException: null
    at java.base/java.util.HashMap$HashIterator.nextNode(HashMap.java:1597)
    at java.base/java.util.HashMap$KeyIterator.next(HashMap.java:1620)
    at org.dcache.chimera.namespace.HsmCleaner.moveLocationsBackToPending(HsmCleaner.java:205)
    at org.dcache.chimera.namespace.HsmCleaner.timeout(HsmCleaner.java:308)
    at org.dcache.chimera.namespace.HsmCleaner$Timeout.run(HsmCleaner.java:102)
    at java.base/java.util.TimerThread.mainLoop(Timer.java:566)
    at java.base/java.util.TimerThread.run(Timer.java:516)