[TAP5-2406] PeriodicExecutor service can rarely reach a deadlock when trying to run a job and modify the list of jobs

• Type: Bug
• Status: Closed
• Priority: Blocker
• Resolution: Fixed
• Affects Version/s: 5.3.7, 5.4
• Fix Version/s: 5.4
• Component/s: tapestry-ioc
• Assignee: Howard Lewis Ship
• Reporter: Jun Tsai
• Created: 20/Oct/14 06:06
• Updated: 24/Oct/14 21:41
• Resolved: 24/Oct/14 21:00

Description

"Tapestry PeriodicExecutor":
at org.apache.tapestry5.ioc.internal.services.cron.PeriodicExecutorImpl$Job.isExecuting(PeriodicExecutorImpl.java:84)

• waiting to lock <0x00000006c2ad83e8> (a org.apache.tapestry5.ioc.internal.services.cron.PeriodicExecutorImpl$Job)
  at org.apache.tapestry5.ioc.internal.services.cron.PeriodicExecutorImpl.executeCurrentBatch(PeriodicExecutorImpl.java:299)
• locked <0x00000006bffbb7a8> (a org.apache.tapestry5.ioc.internal.services.cron.PeriodicExecutorImpl)
  at org.apache.tapestry5.ioc.internal.services.cron.PeriodicExecutorImpl.run(PeriodicExecutorImpl.java:249)
  at java.lang.Thread.run(Thread.java:744)

"monad-background-6":
at org.apache.tapestry5.ioc.internal.services.cron.PeriodicExecutorImpl.removeJob(PeriodicExecutorImpl.java:211)

• waiting to lock <0x00000006bffbb7a8> (a org.apache.tapestry5.ioc.internal.services.cron.PeriodicExecutorImpl)
  at org.apache.tapestry5.ioc.internal.services.cron.PeriodicExecutorImpl$Job.cleanupAfterExecution(PeriodicExecutorImpl.java:161)
• locked <0x00000006c2ad83e8> (a org.apache.tapestry5.ioc.internal.services.cron.PeriodicExecutorImpl$Job)
  at org.apache.tapestry5.ioc.internal.services.cron.PeriodicExecutorImpl$Job.invoke(PeriodicExecutorImpl.java:181)
  at org.apache.tapestry5.ioc.internal.services.cron.PeriodicExecutorImpl$Job.invoke(PeriodicExecutorImpl.java:48)
  at org.apache.tapestry5.ioc.internal.services.ParallelExecutorImpl$1.call(ParallelExecutorImpl.java:58)
  at java.util.concurrent.FutureTask.run(FutureTask.java:262)
  at egfit.f.p$a$b.run(ThreadPoolModule.scala:85)
  at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
  at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
  at java.lang.Thread.run(Thread.java:744)

Found 1 deadlock.

---------------------------------------------------------------------------------------------

Found one Java-level deadlock:
=============================
"Tapestry PeriodicExecutor":
waiting to lock monitor 0x00007f641cef7298 (object 0x00000006c2ad83e8, a org.apache.tapestry5.ioc.internal.services.cron.PeriodicExecutorImpl$Job),
which is held by "monad-background-6"
"monad-background-6":
waiting to lock monitor 0x00007f641c761868 (object 0x00000006bffbb7a8, a org.apache.tapestry5.ioc.internal.services.cron.PeriodicExecutorImpl),
which is held by "Tapestry PeriodicExecutor"