IJ27786: LPAR CRASHES IN VFC STACK ON P9 APPLIES TO AIX 7200-05

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• AIX lpar may end up with a crash with stack showing
  vfc_process_mad. Particularly observed on P9 and above.
  The AIX vfc client driver did not synchronize the command
  buffer before sending the cmd address to VIOS vfc-host.
  Consequently VIOS vfc-host would process a stale cmd and
  when the response for stale cmd is processed on AIX lpar, it
  might crash the operating system.
  

Local fix

Problem summary

• AIX lpar may end up with a crash with stack showing
  vfc_process_mad. Particularly observed on P9 and above.
  The AIX vfc client driver did not synchronize the command
  buffer before sending the cmd address to VIOS vfc-host.
  Consequently VIOS vfc-host would process a stale cmd and
  when the response for stale cmd is processed on AIX lpar, it
  might crash the operating system.
  

Problem conclusion

• Code fix to synchronize the command buffer before
  sending the cmd to VIO.
  

Temporary fix

Comments

• 7100-05 - use AIX APAR IJ28592
  7200-05 - use AIX APAR IJ27786
  

APAR Information

• APAR is sysrouted FROM one or more of the following:

• APAR is sysrouted TO one or more of the following:

  IJ28565 IJ28592 IJ28596

Fix information

• Fixed component name

  AIX V7.2

• Fixed component ID

  5765CD200

Applicable component levels

• R720 PSY U879796

     UP20/11/04 I 1000

PTF to Fileset Mapping

• U879796 devices.vdevice.IBM.vfc-client.rte 7.2.5.0