IT35199: Intermittent MQ Appliance reload when SNMP is enabled

Interim fix for IBM MQ Appliance 9.2.1 with APAR(s) IT35457 IT33213 IT35199. Build ID: p921-L201112.1-IT35457_P
Interim fix for IBM MQ Appliance 9.2.0.1 with APAR(s) IT35457 IT33213 IT35199. Build ID: p920-001-200918-IT35457A_P

APAR status

• Closed as program error.

Error description

• MQ Appliance could reload when SNMP is enabled. The following
  errors can be seen in the default log:
  
  Thread 0x98e9f9bc: death_action: signum 0x000000000000000b,
  si_code 0x0000000000000001, eip 0x00007f6e5b2b4c14, si_addr
  0x0000000000000000
  Thread 0x98e9f9bc: Component=snmp, Domain=default,
  Config=SNMP-Settings
  Thread 0x98e9f9bc: System Name: MQAPP1
  
  The decoded back trace shows the reload was caused by the SNMP
  component.
  
  Died from signal 11 (SEGV)
  Reason Hint: [Crash! Perhaps a bad ptr?]
  Referencing 0x0000000000000000 at 0x7f6e5b2b4c14 in
  /lib64/libc.so.6 + 0x161c14
  Component=snmp, Domain=default, Config=SNMP-Settings
  
  #0    0x7f6e5b2b4c14 in /lib64/libc.so.6 + 0x161c14, basepointer
  0x00007f6c49c4d580
  #1    0x02bb42ed in dpEnviron::Variable::Variable(char const*) +
  0x6d, basepointer 0x00007f6c49c4d580
  #2    0x02bb4ad2 in dpEnviron::setenv(char const*) + 0x42,
  basepointer 0x00007f6c49c4d5b0
  #3    0x02b610b9 in dpMqBinaryClass::SetEnvVars(char const**) +
  0x29, basepointer 0x00007f6c49c4d5d0
  #4    0x02b61188 in dpMqBinaryClass::SetDefaultEnvVars() + 0xb8,
  basepointer 0x00007f6c49c50600
  #5    0x02b61301 in dpMqBinaryClass::dpMqBinaryClass() + 0x121,
  basepointer 0x00007f6c49c50620
  

Local fix

• Disable SNMP.
  

Problem summary

• ****************************************************************
  USERS AFFECTED:
  MQ Appliance users using version 9.2 LTS and 9.2.x CD
  
  
  Platforms affected:
  MultiPlatform
  
  ****************************************************************
  PROBLEM DESCRIPTION:
  An improper use of a character buffer within the MQ Appliance
  code exposed a timing window which may cause a SIGSEGV error in
  the SNMP component, resulting in appliance reload.
  

Problem conclusion

• The code has been modified to prevent the crash.
  
  ---------------------------------------------------------------
  The fix is targeted for delivery in the following PTFs:
  
  Version    Maintenance Level
  v9.2 LTS   9.2.0.2
  v9.x CD    9.2.2
  
  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

  MQ APPL M2002 V

• Fixed component ID

  5737H4701

Applicable component levels