IT43178: The channel pooling process might terminate due to a SIGSEGV in xcsWaitPid.

APAR status

• Closed as program error.

Error description

• The channel pooling process 'amqrmppa' terminates due to a
  SIGSEGV.
  
  When this happens, an FDC file is generated containing the
  following key header information and function stack:
  
  Probe Id         :- XC130003
  Component        :- xehExceptionHandler
  Program Name     :- amqrmppa
  Major Errorcode  :- STOP
  Probe Type       :- HALT6109
  Arith1           :- 11 (0xb)
  Comment1         :- SIGSEGV: address not mapped(0x40)
  
  O/S Call Stack for current thread
  /opt/mqm/lib64/libmqmcs_r.so(+0x11305f)[0x7f4dca36d05f]
  /opt/mqm/lib64/libmqmcs_r.so(+0x13a37a)[0x7f4dca39437a]
  /opt/mqm/lib64/libmqmcs_r.so(+0x138666)[0x7f4dca392666]
  /opt/mqm/lib64/libmqmcs_r.so(xcsFFSTFn+0x1c5b)[0x7f4dca39605b]
  /opt/mqm/lib64/libmqmcs_r.so(xehExceptionHandler+0x7da)[0x7f4dca
  385f7a]
  /usr/lib64/libpthread.so.0(+0x118e0)[0x7f4dc9a958e0]
  /usr/lib64/libpthread.so.0(__pthread_mutex_trylock+0x14)[0x7f4dc
  9a8df14]
  /opt/mqm/lib64/libmqmcs_r.so(xcsRequestThreadMutexSem+0xbd)[0x7f
  4dca3a03ed]
  /opt/mqm/lib64/libmqmcs_r.so(xcsWaitPid+0x4c8)[0x7f4dca408208]
  /opt/mqm/lib64/libmqmcs_r.so(+0x12e231)[0x7f4dca388231]
  /opt/mqm/lib64/libmqmcs_r.so(+0x1bcc0e)[0x7f4dca416c0e]
  /usr/lib64/libpthread.so.0(+0x744b)[0x7f4dc9a8b44b]
  /usr/lib64/libc.so.6(clone+0x3f)[0x7f4dc95c252f]
  
  MQM Function Stack
  xehAsySignalMonitor
  xcsWaitPid
  xcsRequestThreadMutexSem
  xcsFFST
  

Local fix

Problem summary

• ****************************************************************
  USERS AFFECTED:
  IBM MQ users on Linux or UNIX, who use channel exits which
  create child processes.
  
  
  Platforms affected:
  MultiPlatform
  
  ****************************************************************
  PROBLEM DESCRIPTION:
  The IBM MQ channel pooling process failed with an FFST showing
  Probe Id XC130003 from component 'xehExceptionHandler' and then
  terminated if it created a child process which subsequently
  exited.
  

Problem conclusion

• The IBM MQ channel pooling process now correctly handles the
  termination of a child process without writing an FFST or
  terminating unexpectedly itself.
  
  ---------------------------------------------------------------
  The fix is targeted for delivery in the following PTFs:
  
  Version    Maintenance Level
  v9.2 LTS   9.2.0.25
  v9.3 LTS   9.3.0.20
  v9.4 LTS   9.4.0.0
  
  The latest available maintenance can be obtained from
  'IBM MQ Recommended Fixes'
  https://www.ibm.com/support/pages/recommended-fixes-ibm-mq
  
  If the maintenance level is not yet available information on
  its planned availability can be found in 'IBM MQ
  Planned Maintenance Release Dates'
  https://ibm.biz/mqplannedmaintenance
  
  ---------------------------------------------------------------
  

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

  MQ APPLIANCE M2

• Fixed component ID

  5900ALJ00

Applicable component levels