IT21447: MQ APPLIANCE userrestore command generates FDC reporting SIGSEGV

APAR status

• Closed as program error.

Error description

• Customer was using the "userrestore" command to restore backed
  up users but the restore caused SIGSEGV and generates a failure
  data capture (FDC) report and fails to restore the users
  properly. The FDC generated had the following header and the
  stack.
  
  Component         :- xehExceptionHandler
  Program Name      :- amquserback
  Arith1            :- 11 (0xb)
  Comment1          :- SIGSEGV: address not mapped(0x383639312d34)
  
  O/S Call Stack for current thread
  /opt/mqm/lib64/libmqmcs_r.so(xcsPrintStackForCurrentThread+0x3e)
  [0x7fcef2a825ce]
  /opt/mqm/lib64/libmqmcs_r.so(+0x11ff4a)[0x7fcef2aa0f4a]
  /opt/mqm/lib64/libmqmcs_r.so(PrepareDumpAreas+0xd14)[0x7fcef2a9c
  114]
  /opt/mqm/lib64/libmqmcs_r.so(xcsFFSTFn+0x18ee)[0x7fcef2a9ee5e]
  /opt/mqm/lib64/libmqmcs_r.so(xehExceptionHandler+0x965)[0x7fcef2
  a99555]
  /lib64/libpthread.so.0(+0xf8a0)[0x7fcef21aa8a0]
  /lib64/libc.so.6(_IO_vfprintf+0x3e5c)[0x7fcef1c4879c]
  /lib64/libc.so.6(vsnprintf+0x99)[0x7fcef1c70669]
  /lib64/libc.so.6(snprintf+0x94)[0x7fcef1c4ff64]
  amquserback[0x40441b]
  amquserback[0x40613b]
  /lib64/libc.so.6(__libc_start_main+0x10f)[0x7fcef1c1ed8f]
  amquserback[0x401579]
  
  MQM Function Stack
  userback_main
  dpcCmd_userRestore
  xcsFFST
  

Local fix

• n/a
  

Problem summary

• ****************************************************************
  USERS AFFECTED:
  All MQ appliance users
  
  
  Platforms affected:
  MultiPlatform
  
  ****************************************************************
  PROBLEM DESCRIPTION:
  This issue occurred due to an internal logic error which made an
  illegal memory access by passing an incorrect number of
  parameters to the snprintf() function.
  

Problem conclusion

• The MQ appliance userrestore command has been updated to pass
  the correct parameters to snprintf().
  
  ---------------------------------------------------------------
  The fix is targeted for delivery in the following PTFs:
  
  Version    Maintenance Level
  v8.0       8.0.0.8
  v9.0 CD    9.0.4
  
  The latest available maintenance can be obtained from
  'WebSphere MQ Recommended Fixes'
  http://www-1.ibm.com/support/docview.wss?rs=171&uid=swg27006037
  
  If the maintenance level is not yet available information on
  its planned availability can be found in 'WebSphere MQ
  Planned Maintenance Release Dates'
  http://www-1.ibm.com/support/docview.wss?rs=171&uid=swg27006309
  ---------------------------------------------------------------
  

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

  IBM MQ APPL M20

• Fixed component ID

  5725S1400

Applicable component levels

• R800 PSY

     UP