IBM Support

IT10092: FLOW HANGS DUE TO DEADLOCK IN FILEOUTPUT NODE

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APAR status

  • Closed as program error.

Error description

  • When using the FileOutput node, a Java deadlock can occur
    between the message flow thread, as it closes a file, and a
    worker thread that closes any leftover files.
    
    This causes the message flow to hang.
    
    If a javacore is generated during the hang, a deadlock similar
    to the following is reported:
    
    1LKDEADLOCK Deadlock detected !!!
    NULL ---------------------
    NULL
    2LKDEADLOCKTHR Thread "Thread-19" (0x000000005056B400)
    3LKDEADLOCKWTR is waiting for:
    4LKDEADLOCKMON sys_mon_t:0x00000001176C15A8 infl_mon_t:
    0x00000001176C15F0:
    4LKDEADLOCKOBJ
    com/ibm/broker/flowgroupfiles/FlowGroupFilePool@0x000000004036BB
    28
    3LKDEADLOCKOWN which is owned by:
    2LKDEADLOCKTHR Thread "FlowGroupFilePool file close daemon"
    (0x0000000050501E00)
    3LKDEADLOCKWTR which is waiting for:
    4LKDEADLOCKMON sys_mon_t:0x00000001176C1D88 infl_mon_t:
    0x00000001176C1DD0:
    4LKDEADLOCKOBJ
    com/ibm/broker/flowgroupfiles/FlowGroupFile@0x000000004F8DD3F0
    3LKDEADLOCKOWN which is owned by:
    2LKDEADLOCKTHR Thread "Thread-19" (0x000000005056B400)
    
    This deadlock is more likely to occur when running with
    additional instances, or if closure of the files by the flow
    thread is delayed - for example, if there is a large number of
    files being transferred to a remote system over FTP.
    

Local fix

Problem summary

  • ****************************************************************
    USERS AFFECTED:
    All users of IBM Integration Bus v9.0.0.3 and above, or IBM
    Integration Bus v10.
    
    
    Platforms affected:
    z/OS, MultiPlatform
    
    ****************************************************************
    PROBLEM DESCRIPTION:
    When using the FileOutput node, a Java deadlock can occur
    between the message flow thread, as it closes a file, and a
    worker thread that closes any leftover files.
    
    This causes the message flow to hang.
    
    If a javacore is generated during the hang, a deadlock similar
    to the following is reported:
    
    1LKDEADLOCK Deadlock detected !!!
    NULL ---------------------
    NULL
    2LKDEADLOCKTHR Thread "Thread-19" (0x000000005056B400)
     3LKDEADLOCKWTR is waiting for:
      4LKDEADLOCKMON sys_mon_t:0x00000001176C15A8 infl_mon_t:
    0x00000001176C15F0:
      4LKDEADLOCKOBJ
    com/ibm/broker/flowgroupfiles/FlowGroupFilePool@0x000000004036BB
    28
     3LKDEADLOCKOWN which is owned by:
    2LKDEADLOCKTHR Thread "FlowGroupFilePool file close daemon"
    (0x0000000050501E00)
     3LKDEADLOCKWTR which is waiting for:
      4LKDEADLOCKMON sys_mon_t:0x00000001176C1D88 infl_mon_t:
    0x00000001176C1DD0:
      4LKDEADLOCKOBJ
    com/ibm/broker/flowgroupfiles/FlowGroupFile@0x000000004F8DD3F0
     3LKDEADLOCKOWN which is owned by:
    2LKDEADLOCKTHR Thread "Thread-19" (0x000000005056B400)
    
    This deadlock is more likely to occur when running with
    additional instances, or if closure of the files by the flow
    thread is delayed - for example, if there's a large number of
    files being transferred to a remote system over FTP.
    
    
    There are a number of resource name changes between WebSphere
    Message Broker and IBM Integration Bus Version 9.0. For details
    visit
    http://pic.dhe.ibm.com/infocenter/wmbhelp/v9r0m0/topic/com.ibm.e
    tools.mft.doc/bb23814_.htm
    

Problem conclusion

  • The product now ensures that Java locks are obtained in a
    different sequence, such that the deadlock described in this
    APAR cannot occur.
    
    ---------------------------------------------------------------
    The fix is targeted for delivery in the following PTFs:
    
    Version    Maintenance Level
    v9.0       9.0.0.5
    v10.0      10.0.0.2
    
    The latest available maintenance can be obtained from:
    http://www-01.ibm.com/support/docview.wss?rs=849&uid=swg27006041
    
    If the maintenance level is not yet available,information on
    its planned availability can be found on:
    http://www-1.ibm.com/support/docview.wss?rs=849&uid=swg27006308
    ---------------------------------------------------------------
    

Temporary fix

Comments

APAR Information

  • APAR number

    IT10092

  • Reported component name

    INTEGRATION BUS

  • Reported component ID

    5724J0530

  • Reported release

    900

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt / Xsystem

  • Submitted date

    2015-07-17

  • Closed date

    2015-09-13

  • Last modified date

    2015-09-13

  • APAR is sysrouted FROM one or more of the following:

  • APAR is sysrouted TO one or more of the following:

Fix information

  • Fixed component name

    INTEGRATION BUS

  • Fixed component ID

    5724J0530

Applicable component levels

  • R900 PSY

       UP

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Document Information

Modified date:
23 March 2020