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IT12711: DEADLOCK CONDITION DURING A MULTI-SESSION LANFREE RESTORE

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You can track all active APARs for this component.

APAR status

  • Closed as program error.

Error description

  • When performing a lanfree restore utilizing multiple sessions,
    it is possible that 2 of the sessions may attempt to
    simultaneously acquire the same input volume.  This results in a
    deadlock condition that can cause the restore operation to fail.
    When this condition occurs, the SHOW LOCKS command will show
    output similar to the following:
    
       LockDesc: Type=36002(as volume id), NameSpace=34843,
       SummMode=sLock, Key=''
         Holder: (smtb.c:7728 Thread 365164) Tsn=0:22860851,
         Mode=sLock
         Waiter: (asvolacq.c:3674 Thread 376529) Tsn=0:22860861,
         Mode=xLock
         Waiter: (asvolacq.c:1367 Thread 365164) Tsn=0:22860864,
         Mode=sLock
    
    As seen above, the deadlock condition occurs because one thread
    (365164) is attempting to acquire multiple shared locks on the
    volume id, but is unable to do so because another thread
    (376529) is attempting to acquire an exclusive lock on the same
    volume id.
    
    Tivoli Storage Manager Versions Affected:
    All server versions and platforms
    
    Initial Impact:
    Medium
    
    Additional Keywords:
    spectrum protect lan-free hang reserved streams channels
    

Local fix

Problem summary

  • ****************************************************************
    * USERS AFFECTED:                                              *
    * All Tivoli Storage Manager Server users of Lanfree.          *
    ****************************************************************
    * PROBLEM DESCRIPTION:                                         *
    * See ERROR DESCRIPTION.                                       *
    ****************************************************************
    * RECOMMENDATION:                                              *
    * Apply fixing levels when available.                          *
    * This problem is currently projected to be fixed in levels    *
    * 6.3.6 and 7.1.5                                              *
    * Note that this is subject to change at the discretion of     *
    * IBM.                                                         *
    ****************************************************************
    

Problem conclusion

  • This problem was fixed.
    Affected platforms:  AIX, HP-UX, Sun Solaris, Linux, and
    Windows.
    

Temporary fix

Comments

APAR Information

  • APAR number

    IT12711

  • Reported component name

    TSM SERVER

  • Reported component ID

    5698ISMSV

  • Reported release

    63A

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt / Xsystem

  • Submitted date

    2015-12-09

  • Closed date

    2016-01-20

  • Last modified date

    2016-01-20

  • 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

    TSM SERVER

  • Fixed component ID

    5698ISMSV

Applicable component levels

  • R63A PSY

       UP

  • R63H PSY

       UP

  • R63L PSY

       UP

  • R63S PSY

       UP

  • R63W PSY

       UP

  • R71A PSY

       UP

  • R71H PSY

       UP

  • R71L PSY

       UP

  • R71S PSY

       UP

  • R71W PSY

       UP



Document information

More support for: Tivoli Storage Manager

Software version: 63A

Reference #: IT12711

Modified date: 20 January 2016