IT25632: A multi-threaded backup can lead to client / API crash on MSVCR110.dll

APAR status

• Closed as program error.

Error description

• A multi-threaded backup (for example, with dsmc or with tdpsqlc)
  can crash during a backup.   This behavior has been seen with
  'dsmc backup vm', as well as with Data Protection for SQL's
  'tdpsqlc backup', but the crash may occur with other API
  applications.
  
  
  Customer/L2 Diagnostics:
  The issue occurs when the threads from a multi-session backup
  is attempting to access the password file concurrently.  Windows
  application event log will report MSVCR110.dll as the faulting
  application, and entries similar to the following will be
  reported in the stack trace of the .dmp file
  
  tsmapi64!psFileLock::lockExclusive+0x2f
  tsmapi64!psPasswordFile::lockPasswordFile+0x117
  tsmapi64!pswdFGetPassword+0x124
  tsmapi64!scPswdEncrypt+0x61
  tsmapi64!cuSignOnEnhanced+0xd6b
  tsmapi64!scSignOnTheSession+0x203
  tsmapi64!NegotiateSession+0x36d
  tsmapi64!OpenSess+0x39d
  tsmapi64!Logon+0x2ca
  tsmapi64!CheckSession+0x1c9
  tsmapi64!Dedup::CreateDedupSession+0x257
  tsmapi64!Dedup::init+0x64
  tsmapi64!tsmSendObj+0x4b4
  tsmapi64!dsmSendObj+0x1b2
  
  
  Versions Affected:
  Backup-Archive Client 7.1, and 8.1 on Windows
  
  Initial Impact: Low
  
  Additional Keywords: TSM, IBM Spectrum Protect, tdpsqlc, dsmc,
  TDP, SQL
  

Local fix

• Run single-threaded backup
  

Problem summary

• ****************************************************************
  * USERS AFFECTED:                                              *
  * Backup-Archive client version 8.1 running on all Microsoft   *
  * Windows x64 platforms.                                       *
  ****************************************************************
  * PROBLEM DESCRIPTION:                                         *
  * See ERROR DESCRIPTION                                        *
  ****************************************************************
  * RECOMMENDATION:                                              *
  * Apply fixing level when available. This problem is currently *
  * projected to be fixed in levels 8.1.4.1 and 8.1.6. Note that *
  * this is subject to change at the discretion of IBM.          *
  ****************************************************************
  

Problem conclusion

• User might experience program crash due to the fact that some
  functions for password file management are not thread-safe.
  Fix: make the involved functions thread-safe.
  

Temporary fix

Comments

APAR Information

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

  IT23781

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

Modules/Macros

• dsmc
  

Fix information

• Fixed component name

  TSM CLIENT

• Fixed component ID

  5698ISMCL

Applicable component levels