IJ54392: PROBABLE SYSTEM CRASH AT XM_BAD_FREE APPLIES TO AIX 7300-02

APAR status

• Closed as program error.

Error description

• Probable system crash with below stack while changing the fc
  adapter ODM attribute io_dma value.
  Example :
  #chdev -l fcs0 -a io_dma=2048 -U
  fcs0 changed
  
  KDB(0)> f
  pvthread+090500 STACK:
  Ý0002CD00¨abend_trap+000000 ()
  Ý00081B2C¨xm_bad_free+00026C (??, ??, ??, ??)
  Ý001126F8¨xmfree_backend+0008F8 (000000000070EEB4,
  F1000B01C0000000, F00000002FF46410, 0000000000000000,
  0000004500000045)
  Ý00111968¨xmfree_frontend+000128 (??, ??, ??)
  ÝF10009D5A020CC0C¨cvfc_scsi_queue_cleanup+00028C (??, ??, ??)
  ÝF10009D5A01D73B0¨cvfc_cfg_updt_io_dma+000250 (??, ??)
  ÝF10009D5A01D7CF0¨cvfc_cfg_update+0002B0 (??, ??, ??)
  ÝF10009D5A01E0FA8¨cvfc_config+0003E8 (??, ??)
  

Local fix

Problem summary

• Probable system crash with below stack while changing the fc
  adapter ODM attribute io_dma value.
  Example :
  #chdev -l fcs0 -a io_dma=2048 -U
  fcs0 changed
  
  KDB(0)> f
  pvthread+090500 STACK:
   0002CD00 abend_trap+000000 ()
   00081B2C xm_bad_free+00026C (??, ??, ??, ??)
   001126F8 xmfree_backend+0008F8 (000000000070EEB4,
  F1000B01C0000000, F00000002FF46410, 0000000000000000,
  0000004500000045)
   00111968 xmfree_frontend+000128 (??, ??, ??)
   F10009D5A020CC0C cvfc_scsi_queue_cleanup+00028C (??, ??, ??)
   F10009D5A01D73B0 cvfc_cfg_updt_io_dma+000250 (??, ??)
   F10009D5A01D7CF0 cvfc_cfg_update+0002B0 (??, ??, ??)
   F10009D5A01E0FA8 cvfc_config+0003E8 (??, ??)
  

Problem conclusion

• Fixed the FC driver code to avoid the crash
  

Temporary fix

Comments

APAR Information

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

  IJ53684

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

Fix information

• Fixed component name

  AIX V7.3

• Fixed component ID

  5765CD300

Applicable component levels