[ https://issues.jboss.org/browse/JGRP-1460?page=com.atlassian.jira.plugin.... ] freeliuade freeliuade updated JGRP-1460: ---------------------------------------- Description: I tried 2.12.1.final and 3.1.0.Alpha3, both versions can reproduce. two nodes, one node do lock/unlock, kill another node. then dead lock will happen. "Steps to Reproduce" has a way can always reproduce this issue. (BTW, I have another issue relative with TCP, I meet "[org.jgroups.protocols.TCP] discarded message from different cluster" warning, not sure why get traffic between two groups. I thought TCP would not send msg accors groups, could you please help explain this? my email is: freeliuade(a)yahoo.com.cn. or please let me know a fourm I can ask this question) following is the thread dump: Found one Java-level deadlock: ============================= "ViewHandler,myClusterGroup,pek-wkst2cwxc-13306": waiting to lock monitor 0x16be6f7c (object 0x02b7e218, a org.jgroups.protocols.PEER_LOCK$PeerLock), which is held by "main" "main": waiting to lock monitor 0x16be6f14 (object 0x02f14118, a java.util.HashMap), which is held by "ViewHandler,myClusterGroup,pek-wkst2cwxc-13306" Java stack information for the threads listed above: =================================================== "ViewHandler,myClusterGroup,pek-wkst2cwxc-13306": at org.jgroups.protocols.PEER_LOCK$PeerLock.retainAll(PEER_LOCK.java:96) - waiting to lock <0x02b7e218> (a org.jgroups.protocols.PEER_LOCK$PeerLock) at org.jgroups.protocols.PEER_LOCK.handleView(PEER_LOCK.java:76) - locked <0x02f14118> (a java.util.HashMap) at org.jgroups.protocols.Locking.up(Locking.java:271) at org.jgroups.protocols.pbcast.STATE_TRANSFER.up(STATE_TRANSFER.java:178) at org.jgroups.protocols.FRAG2.up(FRAG2.java:181) at org.jgroups.protocols.pbcast.GMS.installView(GMS.java:630) at org.jgroups.protocols.pbcast.CoordGmsImpl.handleViewChange(CoordGmsImpl.java:247) at org.jgroups.protocols.pbcast.GMS.castViewChange(GMS.java:494) at org.jgroups.protocols.pbcast.CoordGmsImpl.handleMembershipChange(CoordGmsImpl.java:223) at org.jgroups.protocols.pbcast.GMS$ViewHandler.process(GMS.java:1387) at org.jgroups.protocols.pbcast.GMS$ViewHandler.run(GMS.java:1341) at java.lang.Thread.run(Thread.java:619) "main": at org.jgroups.protocols.Locking.removeClientLock(Locking.java:566) - waiting to lock <0x02f14118> (a java.util.HashMap) at org.jgroups.protocols.Locking$ClientLock._unlock(Locking.java:976) - locked <0x02b7e218> (a org.jgroups.protocols.PEER_LOCK$PeerLock) at org.jgroups.protocols.Locking$ClientLock.unlock(Locking.java:915) - locked <0x02b7e218> (a org.jgroups.protocols.PEER_LOCK$PeerLock) at org.jgroups.protocols.Locking.down(Locking.java:162) at org.jgroups.stack.ProtocolStack.down(ProtocolStack.java:1022) at org.jgroups.JChannel.down(JChannel.java:729) at org.jgroups.blocks.locking.LockService$LockImpl.unlock(LockService.java:120) at JGroupJDBCPingTest.main(JGroupJDBCPingTest.java:101) Found 1 deadlock. was: I tried 2.12.1.final and 3.1.0.Alpha3, both versions can reproduce. two nodes, one node do lock/unlock, kill another node. then dead lock will happen. "Steps to Reproduce" has a way can always reproduce this issue. (BTW, I have another issue relative with TCP, I meet "[org.jgroups.protocols.TCP] discarded message from different cluster" warning, not sure why get traffic between two groups. I thought TCP would not send msg accors groups, could you please help explain this? my email is: freeliuade(a)yahoo.com.cn. or please let me know a fourm I can ask this question) following is the thread dump: Found one Java-level deadlock: ============================= "ViewHandler,myClusterGroup,pek-wkst2cwxc-13306": waiting to lock monitor 0x16be6f7c (object 0x02b7e218, a org.jgroups.protocols.PEER_LOCK$PeerLock), which is held by "main" "main": waiting to lock monitor 0x16be6f14 (object 0x02f14118, a java.util.HashMap), which is held by "ViewHandler,myClusterGroup,pek-wkst2cwxc-13306" Java stack information for the threads listed above: =================================================== "ViewHandler,myClusterGroup,pek-wkst2cwxc-13306": at org.jgroups.protocols.PEER_LOCK$PeerLock.retainAll(PEER_LOCK.java:96) - waiting to lock <0x02b7e218> (a org.jgroups.protocols.PEER_LOCK$PeerLock) at org.jgroups.protocols.PEER_LOCK.handleView(PEER_LOCK.java:76) - locked <0x02f14118> (a java.util.HashMap) at org.jgroups.protocols.Locking.up(Locking.java:271) at org.jgroups.protocols.pbcast.STATE_TRANSFER.up(STATE_TRANSFER.java:178) at org.jgroups.protocols.FRAG2.up(FRAG2.java:181) at org.jgroups.protocols.pbcast.GMS.installView(GMS.java:630) at org.jgroups.protocols.pbcast.CoordGmsImpl.handleViewChange(CoordGmsImpl.java:247) at org.jgroups.protocols.pbcast.GMS.castViewChange(GMS.java:494) at org.jgroups.protocols.pbcast.CoordGmsImpl.handleMembershipChange(CoordGmsImpl.java:223) at org.jgroups.protocols.pbcast.GMS$ViewHandler.process(GMS.java:1387) at org.jgroups.protocols.pbcast.GMS$ViewHandler.run(GMS.java:1341) at java.lang.Thread.run(Thread.java:619) "main": at org.jgroups.protocols.Locking.removeClientLock(Locking.java:566) - waiting to lock <0x02f14118> (a java.util.HashMap) at org.jgroups.protocols.Locking$ClientLock._unlock(Locking.java:976) - locked <0x02b7e218> (a org.jgroups.protocols.PEER_LOCK$PeerLock) at org.jgroups.protocols.Locking$ClientLock.unlock(Locking.java:915) - locked <0x02b7e218> (a org.jgroups.protocols.PEER_LOCK$PeerLock) at org.jgroups.protocols.Locking.down(Locking.java:162) at org.jgroups.stack.ProtocolStack.down(ProtocolStack.java:1022) at org.jgroups.JChannel.down(JChannel.java:729) at org.jgroups.blocks.locking.LockService$LockImpl.unlock(LockService.java:120) at JGroupJDBCPingTest.main(JGroupJDBCPingTest.java:101) Found 1 deadlock. -- This message is automatically generated by JIRA. 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[ https://issues.jboss.org/browse/JGRP-1460?page=com.atlassian.jira.plugin.... ] Bela Ban resolved JGRP-1460. ---------------------------- Resolution: Done Replaced HashMap with ConcurrentHashMap and removed synchronization around client-locks -- This message is automatically generated by JIRA. If you think it was sent incorrectly, please contact your JIRA administrators: https://issues.jboss.org/secure/ContactAdministrators!default.jspa For more information on JIRA, see: http://www.atlassian.com/software/jira