PH54204: SEGMENTATION FAULT IN THE WEBSERVER PLUGIN

APAR status

• Closed as program error.

Error description

• The customer's apache-webserver in front of Websphere crash
  repeatedly with segmentation faults and writing core dumps.
  
  In the apache error_logs they see a large number of logmessages
  like:
  
  [2023-03-09 17:24:25.488136] [hostname] [core:notice] [pid
  8330:tid 139634849019776] AH00051: child pid 30276 exit signal
  Segmentation fault (11), possible coredump in
  /tools/apache_ppva/2.4.55
  [2023-03-09 17:24:33.494163] [hostname] [core:notice] [pid
  8330:tid 139634849019776] AH00051: child pid 35016 exit signal
  Segmentation fault (11), possible coredump in
  /IHS2.4.55
  
  The core dumps show, that the problem is related to odrlib:
  
  Core was generated by `/IHS/bin/httpd -D
  FOREGROUND -k start'.
  Program terminated with signal SIGABRT, Aborted.
  #0  0x00007f9aca038cbb in raise () from /lib64/libc.so.6
  [Current thread is 1 (Thread 0x7f99c20ed700 (LWP 48213))]
  (gdb) bt
  #0  0x00007f9aca038cbb in raise () from /lib64/libc.so.6
  #1  0x00007f9aca03a355 in abort () from /lib64/libc.so.6
  #2  0x00007f9ac3500d7c in forget (this_=0xdbfcd0, pool=0xdcc100,
  object=0x17b5370 "D\350M�\177", parentNodePtr=0x7f99c20ecde0,
  file=0x7f9ac353ef00 "/blddir/WAS90.NATV/NATV/ws/code/plugins
  .http/odrlib/src/odrThread.c",line=64)
  at /blddir/WAS90.NATV/NATV/ws/code/plugins.http/odrlib/src/o
  drLibUtil.c:867
  #3  0x00007f9ac3500fa9 in Heap_objectDeallocateDebug
  (this_=0xdbfcd0, object=0x17b5370, objSize=24, parent=0xeda0f0,
  file=0x7f9ac353ef00 "/blddir/WAS90.NATV/NATV/ws/code/plugins
  .http/odrlib/src/odrThread.c",line=64)
  at /blddir/WAS90.NATV/NATV/ws/code/plugins.http/odrlib/src/o
  drLibUtil.c:920
  #4  0x00007f9ac35018c0 in odrFreeDbg (p=0x17b5370,
  parent=0xeda0f0, file=0x7f9ac353ef00 "/blddir/WAS90.NATV/NATV/w
  s/code/plugins.http/odrlib/src/odrThread.c",
  line=64) at /blddir/WAS90.NATV/NATV/ws/code/plugins.http/odr
  lib/src/odrLibUtil.c:1120
  #5  0x00007f9ac3517b1a in odrStartRoutineWrapper (arg=0x17b5370)
  at /blddir/WAS90.NATV/NATV/ws/code/plugins.http/odrlib/src/odrT
  hread.c:64
  #6  0x00007f9aca5f16ea in start_thread () from
  /lib64/libpthread.so.0
  #7  0x00007f9aca105a6f in clone () from /lib64/libc.so.6
  

Local fix

• The customer has been provided to apply libodr.so.
  

Problem summary

• ****************************************************************
  * USERS AFFECTED:  All users of IBM WebSphere Application      *
  *                  Server                                      *
  ****************************************************************
  * PROBLEM DESCRIPTION: Intelligent Management enabled Plugin   *
  *                      causes a segmentation fault             *
  ****************************************************************
  * RECOMMENDATION:                                              *
  ****************************************************************
  The web server will produce a segmentation fault when a
  specific
  combination of events occurs.  The combination of a null value
  set for any Intelligent Management property for web servers on
  a
  web server with underscores in the name of the cell, node or
  web
  server. To see if the properties have been set to null please
  see this page https://www.ibm.com/docs/en/was-zos/9.0.5?
  topic=overview-configuring-intelligent-management-properties-
  web-servers
  If both conditions are met the segmentation fault will occur.
  

Problem conclusion

• The code was updated to properly process the presence of a null
  value
  
  The fix for this APAR is targeted for inclusion in fix pack
  9.0.5.16 and 8.5.5.24. For more information, see 'Recommended
  Updates for WebSphere Application Server':
  https://www.ibm.com/support/pages/node/715553
  

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

  WEBS APP SERV N

• Fixed component ID

  5724H8800

Applicable component levels