IV07865: AIOSERVERS IN THREE-WAY DEADLOCK HANG SYSTEM APPLIES TO AIX 6100-06

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• System hang or slowdown with three CPUs looping in
  slock, called from simple_lock.  At least one of the
  threads has stack trace:
  [0052D2F4]slock+000114 (0000000000000001,
   0FFFFFFFF3FFE750 [??])
  [00009558].simple_lock+000058 ()
  [00237528]bmFree+000108 (??, ??)
  [00237DD8]bmRecycle+000698 (??, ??)
  [0023D120]bmAssign+000640 (??, ??, ??, ??, ??, ??)
  
  and the other two may be in various places in bmAssign:
  [0052D308]slock+000128 (F1000A0807F6FF20,
   0FFFFFFFF3FFE940 [??])
  [00009558].simple_lock+000058 ()
  [0023D134]bmAssign+000654 (??, ??, ??, ??, ??, ??)
  [0023C51C]bmRead+00009C (??, ??, ??, ??, ??, ??)
  [002896D4]xtSearch+0005D4 (??, ??, ??, ??, ??)
  [00291A24]xtLookup+000064 (??, ??, ??, ??, ??, ??, ??)
  
  and
  
  [0052D444]slock+000264 (F1000A12002F8110,
   0FFFFFFFF3FFE940 [??])
  [00009558].simple_lock+000058 ()
  [0023D428]bmAssign+000948 (??, ??, ??, ??, ??, ??)
  [0023C51C]bmRead+00009C (??, ??, ??, ??, ??, ??)
  [002896D4]xtSearch+0005D4 (??, ??, ??, ??, ??)
  [00291A24]xtLookup+000064 (??, ??, ??, ??, ??, ??, ??)
  

Local fix

• Reboot the system.
  

Problem summary

• ****************************************************************
  * USERS AFFECTED:
  * Users of JFS2 file systems running the 6100-06 Technology
  * Level with the bos.mp64 fileset below the 6.1.6.18 level.
  ****************************************************************
  * PROBLEM DESCRIPTION:
  * Possible system hang due to contention for cache/hash/pagerbuf
  * locks.
  ****************************************************************
  * RECOMMENDATION:
  * Install APAR IV07865.
  ****************************************************************
  

Problem conclusion

• bmAssign needs to acuire PAGER_BUFLOCK, in TRY mode
  

Temporary fix

• *********
  * HIPER *
  *********
  

Comments

APAR Information

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

  IV07146

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

Fix information

• Fixed component name

  AIX 610 STD EDI

• Fixed component ID

  5765G6200

Applicable component levels

• R610 PSY U849131

     UP12/03/14 I 1000

PTF to Fileset Mapping

• U849131 bos.mp64 6.1.6.18