IZ66490: CRASH IN XGELL_XMIT DUE TO BAD POINTER APPLIES TO AIX 5300-11

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• System crashes in xgell_xmit with a stack trace similiar
  to
  (8)> f
  pvthread+02AA00 STACK:
  [043BEBC8]xgell_xmit+0002E8 (F10006002E3E5680,
  0000001873D6F40F [??])
  [F1000000A027B7C4]ethchan_output+000304 (??, ??)
  [00014D70].hkey_legacy_gate+00004C ()
  [04A43128]en_output+0008C8 (??, ??, ??, ??)
  [047111A0]ip_output_post_fw+001920 (0000000000000000,
  F10007000BE8E400,
     F00000002FF46B70)
  [047126D4]ip_output+0000D4 (??, ??, ??, ??, ??, ??)
  [0475EB30]tcp_output+0018F0 (??)
  [0475BCD0]tcp_usrreq+001550 (??, ??, ??, ??, ??)
  [0042C398]soesend+001758 (??, ??, ??, ??, ??, ??, ??)
  [0042AA68]soo_write+0003E8 (??, ??, ??)
  [0042A640]soo_rw+000040 (??, ??, ??, ??, ??)
  [0049A94C]rwuio+00012C (??, ??, ??, ??, ??, ??)
  
  xgell_xmit crash is due to a bad pointer when its parsing
  the mbuf. A pointer needs to be initialized by TCP for
  checksum
  offload/largesend and this is not done in a certain
  specific
  case
  

Local fix

• Disable checksum offload or have multipath routing to
  host
  This will prevent route from being null if one route
  fails
  cause there's always an alternate path.
  

Problem summary

• When largesend is enabled on the King adapter, the system can
  crash in the adapter driver trying to read from a bad pointer
  in the packet buffer.
  

Problem conclusion

• Make sure the packet buffer is initialized correctly.
  

Temporary fix

Comments

• 5300-08 - use AIX APAR IZ69552
  5300-09 - use AIX APAR IZ69186
  5300-10 - use AIX APAR IZ69263
  5300-11 - use AIX APAR IZ66490
  6100-04 - use AIX APAR IZ66426
  

APAR Information

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

  IZ46718

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

Fix information

• Fixed component name

  AIX 5.3

• Fixed component ID

  5765G0300

Applicable component levels

• R530 PSY U829926

     UP10/02/08 I 1000

PTF to Fileset Mapping

• U829926 bos.net.tcp.client 5.3.11.1