[DIRMINA-604] Deadlock occurs when implementing two mina StateMachine

• Type: Bug
• Status: Resolved
• Priority: Critical
• Resolution: Won't Fix
• Affects Version/s: 2.0.0-M2
• Fix Version/s: 2.0.8
• Component/s: Statemachine
• Environment: Bug found under:; - windows vista business edition ; - dual core intel machine ; - jdk6_update6
• Assignee: Unassigned
• Reporter: simon trudeau
• Created: 06/Jun/08 15:11
• Updated: 10/Sep/14 09:38
• Resolved: 10/Sep/14 09:38

Description

For mailing list discussion on the issue, see:
http://mina.markmail.org/message/hp2bkg56sf5f6l56?q=list:org.apache.mina.users&page=1#query:list%3Aorg.apache.mina.users+page:1+mid:l6up4s36uag6yvll+state:results

With the mailing list thread is included a jstack stack trace to illustrate the deadlock.

A deadlock occurs when a Mina StateMachine's Filter (A) reads data using messageReceived() while another mina StateMachine's Filter (B) write data at the same time using filterWrite().

My current oberservation show that what witch I thought only occured rarely happens in fact very frequently when there are few concurrent connections! (Basically the faster we can get a response to a request, the more likely the chance of this situation happening!)

The effect of such a deadlock is that it freezes the whole application without possibility of recovering.