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A particular user had a problem with uploading two zip files on issue "create screen. He was getting the error "An internal error has occurred. Please contact your administrator". After several attempts, he attached the files. I did not find anything in atlassian-jira.log but I found these messages in catalina.log:
WARNING [ContainerBackgroundProcessor[StandardEngine[Catalina]]] org.apache.catalina.valves.StuckThreadDetectionValve.notifyStuckThreadCompleted Thread [ajp-nio-8009-exec-863] (id=) was previously reported to be stuck but has completed. It was active for approximately [300,100] milliseconds.
WARNING [ContainerBackgroundProcessor[StandardEngine[Catalina]]] org.apache.catalina.valves.StuckThreadDetectionValve.notifyStuckThreadDetected Thread [ajp-nio-8009-exec-805] (id=) has been active for [127,209] milliseconds (since [11/5/20 8:20 PM]) to serve the same request for [https://myjira.com/rest/internal/2/AttachTemporaryFile?filename=upg7673.zip&size=52085760&atl_token=XXXX-XXXX-XXXX-XXXX&formToken=10fc370375dae9622b3a5d43841883e360e4f3df&projectId=10505] and may be stuck (configured threshold for this StuckThreadDetectionValve is  seconds). There is/are  thread(s) in total that are monitored by this Valve and may be stuck.
at sun.misc.Unsafe.park(Native Method)
I tried to reproduce this error, but everything works good for me. Does anybody know why it happened?
this is hard to diagnose from just looking at catalina.out but a first guess would be that the file was too large to allow the process to be completed within time.
The parameter "size=52085760" could be a hint - but anyway:
is this also happening for a smaller sized file?