Message5752

Author	akruis
Recipients	akruis, zyasoft
Date	2010-04-27.07:12:10
SpamBayes Score	1.5156348e-10
Marked as misclassified	No
Message-id	<1272352334.64.0.201297201386.issue1602@psf.upfronthosting.co.za>
In-reply-to

Content
Unfortunately, the bug is fairly hard to trigger. I couldn't reproduce it on my personal development system. You probably need: several threads, memory pressure to trigger garbage collection. At least this are the conditions on my pre-production system. I observed the deadlock twice within about 8-millions transactions. I have attached the thread dumps of both cases. Common to both cases is, that the "RUNNABLE" thread consumes 100% CPU, doesn't perform any system calls and does not return from java.util.HashMap.get / java.util.HashMap.removeEntryForKey. Both methods traverse a linked list and this became cyclic.

Unfortunately, the bug is fairly hard to trigger. I couldn't reproduce it on my personal development system. You probably need: several threads, memory pressure to trigger garbage collection. At least this are the conditions on my pre-production system. I observed the deadlock twice within about 8-millions transactions.

I have attached the thread dumps of both cases. Common to both cases is, that the "RUNNABLE" thread consumes 100% CPU, doesn't perform any system calls and does not return from java.util.HashMap.get / java.util.HashMap.removeEntryForKey. Both methods traverse a linked list and this became cyclic.

History
Date	User	Action	Args
2010-04-27 07:12:14	akruis	set	messageid: <1272352334.64.0.201297201386.issue1602@psf.upfronthosting.co.za>
2010-04-27 07:12:14	akruis	set	recipients: + akruis, zyasoft
2010-04-27 07:12:14	akruis	link	issue1602 messages
2010-04-27 07:12:13	akruis	create