why LinkedBlockingQueue#poll(int, TimeUnit) is hanging up? (original) (raw)

Vitaly Davidovich vitalyd at gmail.com
Tue Sep 11 01:43:42 UTC 2012

Symptoms here are eerily similar to http://bugs.sun.com/view_bug.do?bug_id=6822370, hence I'm curious if it still repros with -XX:+UseMembar.

Sent from my phone On Sep 10, 2012 8:45 PM, "David Holmes" <david.holmes at oracle.com> wrote:

This kind of issue is better discussed, at least initially on Doug Lea's concurrency interest list: concurrency-interest at cs.**oswego.edu<concurrency-interest at cs.oswego.edu>

The stack shows that it is the lock acquisition that is blocking indefinitely, not the poll itself. That is why it doesn't time out and why it hangs again immediately after you interrupt the thread. You need to see what is happening to other threads using this LBQ and whether one of them holds the lock and is itself "stuck" somewhere. You also need to see if there are any asynchronous exceptions involved (Thread.stop use, or StackOverflowException) as these can corrupt the internal state of an AbstractQueuedSynchronizer like ReentrantLock. David On 11/09/2012 4:00 AM, Iris Clark wrote:

Forwarding to core-libs-dev.

iris -----Original Message----- From: Yegor Bugayenko [mailto:egor at technoparkcorp.**com<egor at technoparkcorp.com> ] Sent: Monday, September 10, 2012 5:52 AM To: jdk7-dev at openjdk.java.net Subject: why LinkedBlockingQueue#poll(int, TimeUnit) is hanging up? I already posted the question here: http://stackoverflow.com/**questions/12349881<http://stackoverflow.com/questions/12349881> Could one of you guys take a look? Thanks! - Yegor

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