PM66733: A CRASH MAY OCCUR DUE TO MEMORY CORRUPTION WHEN USING THE TAR ADAPTER IN A MULTI-THREADED ENVIRONMENT

APAR status

• Closed as program error.

Error description

• A crash may occur due to memory corruption when using the TAR
  Adapter in a multi-threaded environment.
  The following is an example stack trace from a WTX 8.3.0.3
  Launcher crash in the free() function on Solaris:
  SunOS -> inside stack trace
  Received signal: 6
  /opt/wtx/bin/launcher:mercStackTrace+0x2cc
  /opt/wtx/bin/launcher:mercExceptHandler+0x294
  /opt/wtx/bin/launcher:sigAbortHandler+0xb0
  /lib/libc.so.1:_thr_slot_offset+0x598
  /lib/libc.so.1:sema_post+0x5fc
  /lib/libc.so.1:sema_post+0x7e4
  /lib/libc.so.1:raise+0xc
  /lib/libc.so.1:abort+0xd0
  /usr/lib/libmtmalloc.so.1:free+0x20c
  /opt/wtx/libs/libm4tar.so:_done+0x4c
  /opt/wtx/libs/libm4tar.so:M4TAR_PutArchive+0x270
  /opt/wtx/libs/libmercrmgr.so:SMCreateRM+0x4a4
  /opt/wtx/libs/libdstxpi.so:__1cPCMpiUserAdapterDPut6MrnOCMpiConn
  ection__v_+0x24
  /opt/wtx/libs/libdstxpi.so:mpiAdaptPut+0x6c
  /opt/wtx/libs/libmercrmgr.so:RMThread+0x1e4
  /opt/wtx/libs/libmercrmgr.so:equal_process_id+0x48
  /lib/libc.so.1:_thr_slot_offset+0x46c
  SunOS -> stack trace end
  

Local fix

• WTXCQ - WTX00040902
  CH / TR
  Circumvention: None
  

Problem summary

• Users Affected:
  WebSphere Transformation Extender customers that invoke the
  m4tar adapter, particularly those in multi-threaded
  environments.
  
  Problem Description:
  The TAR adapter is crashing because of memory corruption.
  
  Platforms Affected:
  ALL
  

Problem conclusion

• The TAR adapter properly handles cleanup operations in order to
  avoid a double free operation that is leading to memory
  corruption.  The double free could occur when an unsuccessful
  tar operation (such as a non-existent or inaccessible archive
  file) follows a successful tar operation.  This problem is
  likely to occur in a multi-threaded environment, particularly if
  a memory allocation takes place between the successful tar
  operation and the unsuccessful tar operation.
  
  Delivered in:
  8.3.0.5, 8.4.0.3
  

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

  WEBSPHERE LAUNC

• Fixed component ID

  5724M4011

Applicable component levels

• R810 PSY

     UP

• R820 PSY

     UP

• R830 PSY

     UP

• R840 PSY

     UP