IZ82561: IN A RARE CASE, SYSTEM WITH LOT OF CPUS MAY HANG IN ADDREPAGE APPLIES TO AIX 5300-10

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• In a rare case, if the system has lot of memory, many
  CPUs and is
  having lot of paging activity, the system may hang with
  one of the
  CPU's stack as
  
  (22)> f
  pvthread+001800 STACK:
  [0012B014]addrepage+000258 (F100070009000000 [??])
  [0012DB94]v_pageout+000100 (??, ??, ??)
  [00174398]v_steal+00046C (??, ??, ??, ??)
  [00175534]v_steal_lrulist+0003B8 (??)
  [00175854]v_pass2+0000D8 (??, ??)
  [0017621C]v_fblru_scanlist+0000B4 (??)
  [0017263C]v_lru+000298 (??)
  [00173D30]v_memp_lru+0001C0 (??)
  [0024EAFC]v_prememp_lru+000020 (??)
  [002EEBF4].backt+000088 ()
  

Local fix

• There is no workaround of the issue. System would need to
  be rebooted.
  

Problem summary

• A system hang with one cpu stuck in addrepage().
  

Problem conclusion

• The addrepage code is modified such that a process will detect
  that it lost the race for an entry, and it will loop until
  it finds an unused entry.
  

Temporary fix

Comments

• 5300-09 - use AIX APAR IZ59687
  5300-10 - use AIX APAR IZ82561
  5300-11 - use AIX APAR IZ82386
  5300-12 - use AIX APAR IZ81664
  6100-02 - use AIX APAR IZ79443
  6100-03 - use AIX APAR IZ79435
  6100-04 - use AIX APAR IZ78922
  6100-05 - use AIX APAR IZ78969
  6100-06 - use AIX APAR IZ74559
  7100-00 - use AIX APAR IZ84451
  

APAR Information

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

  IZ59687

• 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 U839425

     UP10/09/21 I 1000