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nshoy
 Post subject: Getting an "APPARENT DEADLOCK!!!" message
PostPosted: Mon Dec 07, 2015 4:07 pm 
Newbie

Joined: Mon Dec 07, 2015 3:54 pm
Posts: 1
The below log is coming from our Tomcat/Confluence app. Are there any C3P0 settings that can cause this?

2015-12-05 16:50:19,008 WARN [Timer-0] [mchange.v2.async.ThreadPoolAsynchronousRunner] run com.mchange.v2.async.ThreadPoolAsynchronousRunner$DeadlockDetector@52cb2047 -- APPARENT DEADLOCK!!! Creating emergency threads for unassigned pending tasks!
2015-12-05 16:50:19,132 WARN [Timer-0] [mchange.v2.async.ThreadPoolAsynchronousRunner] run com.mchange.v2.async.ThreadPoolAsynchronousRunner$DeadlockDetector@52cb2047 -- APPARENT DEADLOCK!!! Complete Status:
Managed Threads: 3
Active Threads: 3
Active Tasks:
com.mchange.v2.c3p0.stmt.GooGooStatementCache$1StatementCloseTask@34677405 (com.mchange.v2.async.ThreadPoolAsynchronousRunner$PoolThread-#0)
com.mchange.v2.c3p0.stmt.GooGooStatementCache$1StatementCloseTask@73f20f23 (com.mchange.v2.async.ThreadPoolAsynchronousRunner$PoolThread-#1)
com.mchange.v2.c3p0.stmt.GooGooStatementCache$1StatementCloseTask@18bffe4d (com.mchange.v2.async.ThreadPoolAsynchronousRunner$PoolThread-#2)
Pending Tasks:
com.mchange.v2.c3p0.stmt.GooGooStatementCache$1StmtAcquireTask@64d07dec
com.mchange.v2.c3p0.stmt.GooGooStatementCache$1StmtAcquireTask@33fb44a9
com.mchange.v2.c3p0.stmt.GooGooStatementCache$1StmtAcquireTask@3558cde8
com.mchange.v2.resourcepool.BasicResourcePool$1RefurbishCheckinResourceTask@593655b4
com.mchange.v2.resourcepool.BasicResourcePool$1RefurbishCheckinResourceTask@7e34ca2d
com.mchange.v2.resourcepool.BasicResourcePool$1RefurbishCheckinResourceTask@3bc59116
com.mchange.v2.resourcepool.BasicResourcePool$1RefurbishCheckinResourceTask@27b85a02
com.mchange.v2.resourcepool.BasicResourcePool$1RefurbishCheckinResourceTask@381d4dad
com.mchange.v2.resourcepool.BasicResourcePool$1RefurbishCheckinResourceTask@bd6b5a3
com.mchange.v2.resourcepool.BasicResourcePool$1RefurbishCheckinResourceTask@3d2ee667
com.mchange.v2.resourcepool.BasicResourcePool$AcquireTask@52189392
com.mchange.v2.resourcepool.BasicResourcePool$AcquireTask@4b808059
com.mchange.v2.resourcepool.BasicResourcePool$AcquireTask@616a79c8
com.mchange.v2.resourcepool.BasicResourcePool$AcquireTask@15616b6f
com.mchange.v2.resourcepool.BasicResourcePool$AcquireTask@2ed44f60
com.mchange.v2.resourcepool.BasicResourcePool$AcquireTask@74a73fa4
com.mchange.v2.resourcepool.BasicResourcePool$AcquireTask@104363d1
com.mchange.v2.resourcepool.BasicResourcePool$AcquireTask@384e36ae
com.mchange.v2.resourcepool.BasicResourcePool$AcquireTask@16e7f663
com.mchange.v2.resourcepool.BasicResourcePool$AcquireTask@56e0e954
com.mchange.v2.resourcepool.BasicResourcePool$AcquireTask@47f6b65b
com.mchange.v2.resourcepool.BasicResourcePool$AcquireTask@163e3546
com.mchange.v2.resourcepool.BasicResourcePool$AcquireTask@4e1b9212
com.mchange.v2.resourcepool.BasicResourcePool$AcquireTask@741303cd
com.mchange.v2.resourcepool.BasicResourcePool$AcquireTask@c5ec344
com.mchange.v2.resourcepool.BasicResourcePool$AcquireTask@2165abb4
com.mchange.v2.resourcepool.BasicResourcePool$AcquireTask@19ebc78d
com.mchange.v2.resourcepool.BasicResourcePool$AcquireTask@467a0746
com.mchange.v2.resourcepool.BasicResourcePool$AcquireTask@7573a8cf
com.mchange.v2.resourcepool.BasicResourcePool$AcquireTask@7c4fea46
com.mchange.v2.resourcepool.BasicResourcePool$AcquireTask@629dd96c
com.mchange.v2.resourcepool.BasicResourcePool$AcquireTask@692d7408
com.mchange.v2.resourcepool.BasicResourcePool$AcquireTask@271cef2a
com.mchange.v2.resourcepool.BasicResourcePool$AcquireTask@5c99c275
com.mchange.v2.resourcepool.BasicResourcePool$AcquireTask@72adbed1
com.mchange.v2.resourcepool.BasicResourcePool$AcquireTask@6ccac628
com.mchange.v2.resourcepool.BasicResourcePool$AcquireTask@7497a3e4
com.mchange.v2.resourcepool.BasicResourcePool$AcquireTask@f890989
com.mchange.v2.resourcepool.BasicResourcePool$AcquireTask@6dd10956
com.mchange.v2.resourcepool.BasicResourcePool$AcquireTask@36bc256d
com.mchange.v2.resourcepool.BasicResourcePool$AcquireTask@7a3d332d
com.mchange.v2.resourcepool.BasicResourcePool$AcquireTask@47eb0e0d
com.mchange.v2.resourcepool.BasicResourcePool$AcquireTask@18e79c5e
com.mchange.v2.resourcepool.BasicResourcePool$AcquireTask@dcaec18
com.mchange.v2.resourcepool.BasicResourcePool$AcquireTask@55222bb
com.mchange.v2.resourcepool.BasicResourcePool$AcquireTask@536625b7
com.mchange.v2.resourcepool.BasicResourcePool$AcquireTask@57363c27
com.mchange.v2.resourcepool.BasicResourcePool$AcquireTask@29a7512c
com.mchange.v2.resourcepool.BasicResourcePool$AcquireTask@27c23511
com.mchange.v2.resourcepool.BasicResourcePool$AcquireTask@3f2a037b
Pool thread stack traces:
Thread[com.mchange.v2.async.ThreadPoolAsynchronousRunner$PoolThread-#1,5,main]
net.sourceforge.jtds.jdbc.ConnectionJDBC2.releaseTds(ConnectionJDBC2.java:1898)
net.sourceforge.jtds.jdbc.JtdsStatement.close(JtdsStatement.java:853)
net.sourceforge.jtds.jdbc.JtdsPreparedStatement.close(JtdsPreparedStatement.java:486)
com.mchange.v1.db.sql.StatementUtils.attemptClose(StatementUtils.java:41)
com.mchange.v2.c3p0.stmt.GooGooStatementCache$1StatementCloseTask.run(GooGooStatementCache.java:404)
com.mchange.v2.async.ThreadPoolAsynchronousRunner$PoolThread.run(ThreadPoolAsynchronousRunner.java:547)
Thread[com.mchange.v2.async.ThreadPoolAsynchronousRunner$PoolThread-#2,5,main]
net.sourceforge.jtds.jdbc.ConnectionJDBC2.releaseTds(ConnectionJDBC2.java:1898)
net.sourceforge.jtds.jdbc.JtdsStatement.close(JtdsStatement.java:853)
net.sourceforge.jtds.jdbc.JtdsPreparedStatement.close(JtdsPreparedStatement.java:486)
com.mchange.v1.db.sql.StatementUtils.attemptClose(StatementUtils.java:41)
com.mchange.v2.c3p0.stmt.GooGooStatementCache$1StatementCloseTask.run(GooGooStatementCache.java:404)
com.mchange.v2.async.ThreadPoolAsynchronousRunner$PoolThread.run(ThreadPoolAsynchronousRunner.java:547)
Thread[com.mchange.v2.async.ThreadPoolAsynchronousRunner$PoolThread-#0,5,main]
net.sourceforge.jtds.jdbc.ConnectionJDBC2.releaseTds(ConnectionJDBC2.java:1898)
net.sourceforge.jtds.jdbc.JtdsStatement.close(JtdsStatement.java:853)
net.sourceforge.jtds.jdbc.JtdsPreparedStatement.close(JtdsPreparedStatement.java:486)
com.mchange.v1.db.sql.StatementUtils.attemptClose(StatementUtils.java:41)
com.mchange.v2.c3p0.stmt.GooGooStatementCache$1StatementCloseTask.run(GooGooStatementCache.java:404)
com.mchange.v2.async.ThreadPoolAsynchronousRunner$PoolThread.run(ThreadPoolAsynchronousRunner.java:547)
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vlad
 Post subject: Re: Getting an "APPARENT DEADLOCK!!!" message
PostPosted: Tue Dec 08, 2015 3:00 am 
Hibernate Team
Hibernate Team

Joined: Thu Sep 11, 2014 2:50 am
Posts: 1628
Location: Romania
There are all sorts of things you can try to overcome this issue. Check this SO question:

http://stackoverflow.com/questions/14730379/apparent-deadlock-creating-emergency-threads-for-unassigned-pending-tasks
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