IT23996: DISCONNECTION OF A SESSION DURING DATA INGEST TO CONTAINER STORAGE CAN CAUSE IT TO HANG.

8.1.5.000-IBM-SPCMS-WindowsX64
8.1.5.000-IBM-SPCMS-WindowsI32
8.1.5.000-IBM-SPCMS-Linuxx86_64
8.1.5.000-IBM-SPOC-WindowsX64
8.1.5.000-IBM-SPOC-Linuxx86_64
8.1.5.000-IBM-SPOC-Linuxs390x
8.1.5.000-IBM-SPOC-LinuxPPC64le
8.1.5.000-IBM-SPOC-AIX
8.1.5.000-IBM-SPSRV-WindowsX64
8.1.5.000-IBM-SPSRV-Linuxx86_64
8.1.5.000-IBM-SPSRV-Linuxs390x
8.1.5.000-IBM-SPSRV-Linuxppc64le
8.1.5.000-IBM-SPSRV-AIX
IBM Spectrum Protect Server V8.1 Fix Pack 5 (V8.1.5) Downloads

APAR status

• Closed as program error.

Error description

• If a session is disconnected due to a hard failure or a cancel
  session command, the session may not end but hang.  This can
  happen when the disconnect occurs during the ingest of data to a
   directory storage pool. (ie writing to a container)
  
  The problem occurs when the session thread and the control
  thread become out of sync.
  
  The  'Show Threads' could show:
  
  Thread 10324, Parent 274: psSessionThread, Storage 11044506,
  AllocCnt 18003 HighWaterAmt 47947886
     tid=140730650932992, ptid=140733150521088, det=1, zomb=0,
  join=0, result=0, sess=3270, procToken=0, sessToken=3270
     lwp=34289
      Awaiting cond sessP->bufQFullCond (0x0x21b2590), using mutex
  sessP->mutex (0x0x7ffbf41ba848), at sdbuf.c(746)
     Thread context:
       COMMMETHOD: Tcp/Ip
       SRC_STRATEGY: CONTAINER
       SRC_STGPOOL_NAME: CONTAINER_POOL
       SERVER_NAME: SERVER1
       THREAD_TYPE: SESSION
       SESSION_TYPE: SERVER
  
      Thread 10471, Parent 10324: SdCQSinkThread, Storage
  3124105988, AllocCnt 411707 HighWaterAmt 3127747871
       tid=140736141965056, ptid=140730650932992, det=1, zomb=0,
  join=0, result=0, sess=0, procToken=0, sessToken=3270
       lwp=46319
        Awaiting cond sessP->bufQEmptyCond (0x0x21b26e0), using
  mutex sessP->mutex (0x0x7ffbf41ba848), at sdbuf.c(1081)
       Thread context:
         COMMMETHOD: Tcp/Ip
         SRC_STRATEGY: CONTAINER
         SERVER_NAME: SERVER1
         SRC_STGPOOL_NAME: CONTAINER_POOL
         THREAD_TYPE: SESSION
         SESSION_TYPE: SERVER
  
  We see that the first (parent) thread is awaiting for
  bufQFullCond but the second (child) thread is awaiting
  bufQEmptyCond - these are opposite conditions which will never
  be met and hence the session does not end.
  
  The hung session may or may not be cancellable once this state
  is met
  
  
  IBM Spectrum Protect versions affected:   Server version 7.1.3
  and higher, and 8.1 and higher on all platforms
  
  
  Initial Impact:
  Medium
  
  Additional Keywords:
  Tivoli Storage Manager  TSM IBM Spectrum Protect hanging
  

Local fix

• Halt and restart the server
  

Problem summary

• ****************************************************************
  * USERS AFFECTED:                                              *
  * All IBM Spectrum Protect server users of container type      *
  * storage pools.                                               *
  ****************************************************************
  * PROBLEM DESCRIPTION:                                         *
  * See error description.                                       *
  ****************************************************************
  * RECOMMENDATION:                                              *
  * Apply fixing level when available. This problem is currently *
  * projected to be                                              *
  * fixed in level 8.1.5. Note that this is subject to change at *
  * the discretion of IBM.                                       *
  ****************************************************************
  

Problem conclusion

• This problem was fixed.
  
  Affected platforms for reported release:  AIX, Linux, and
  Windows.
  Platforms fixed:   AIX, Linux, Windows.
  

Temporary fix

Comments

APAR Information

• 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