IZ82142: HANG ON VIOC/ VIOS UNDER HEAVY NPIV CLIENT IO LOAD APPLIES TO AIX 5300-11

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• Under heavy NPIV IO load, the VIOC/ VIOS may hang. The
  stack trace of the thread that is looping will look
  similar
  to:
  
  (0)> f 80
  pvthread+005000 STACK:
  Use current context [F00000002FF47600] of cpu 4
  [045B43DC]efsc_npiv_start_pending_cmds+00071C
  [0459C180]efsc_start+000CC0 (??, ??)
  [0459F1F8]efsc_strategy+000D98 (??)
  [0011F6A4]std_devstrat+000364 (??)
  [0011FCD0]devstrat+000050 (??)
  [00014F50].kernel_add_gate_cstack+000030 ()
  [0461FDC0]scsidisk_start_ioctl+000B40 (??)
  [046242E8]scsidisk_start+000668 (??)
  [046250F0]scsidisk_start_disable+000030 (??)
  [045DC2A0]scsidisk_dk_passthru+001640 (??, ??, ??, ??)
  [045D04C0]scsidisk_dkpathpassthru+0000A0 (??, ??, ??)
  [045E006C]scsidisk_ioctl+00044C (??, ??, ??, ??, ??, ??)
  [004AE4E0]rdevioctl+0000C0 (??, ??, ??, ??, ??, ??)
  [00648428]gno_ioctl@AF18_4+000048 (??, ??, ??, ??)
  [005A018C]fp_ioctl+00006C (??, ??, ??, ??)
  [00014F50].kernel_add_gate_cstack+000030 ()
  [F1000000A02BCD8C]hdasd_path_passthru+00014C (??, ??, ??)
  [F1000000A02BCAC8]hdasd_issue_path_passthru+0000A8 (??,
  ??)
  [F1000000A02BEF80]hdasd_issue_passthru+0003E0 (??)
  [F1000000A02CCE6C]target_kproc+00016C (??, ??, ??)
  [00014D70].hkey_legacy_gate+00004C ()
  [001C60D0]procentry+000010 (??, ??, ??, ??)
  

Local fix

Problem summary

• When there is heavy IO traffic in a VIOS providing NPIV service
  to Clients, it might hang.
  

Problem conclusion

• VIOS NPIV related code changed to resolve the hang.
  

Temporary fix

Comments

• 5300-09 - use AIX APAR IZ82347
  5300-10 - use AIX APAR IZ82654
  5300-11 - use AIX APAR IZ82142
  5300-12 - use AIX APAR IZ81696
  6100-02 - use AIX APAR IZ79416
  6100-03 - use AIX APAR IZ73401
  6100-04 - use AIX APAR IZ78881
  6100-05 - use AIX APAR IZ75499
  6100-06 - use AIX APAR IZ77741
  6100-06 - use AIX APAR IZ77464
  6100-06 - use AIX APAR IZ77741
  7100-00 - use AIX APAR IZ80374
  

APAR Information

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

  IZ73401

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

  U839397

Fix information

• Fixed component name

  AIX 5.3

• Fixed component ID

  5765G0300

Applicable component levels

• R530 PSY U839397

     UP10/09/20 I 1000