IZ81097: SYSTEM CRASHED AT PRREADMMAP WHEN RUNNING FUSER APPLIES TO AIX 6100-06

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• system crashed at prReadMmap when running fuser with stack
  trace similiar to
  (0)> f
  pvthread+026200 STACK:
  ￭001F5840prReadMmap+000220 (F1000A10299E5200,
  7777777777777777, 00000000000000B0, F1000A1000000170,
  F10001000800FF80, 0000000000000003, 0000000000001000,
  0004414E951D90CF ￭??)
  ￭001F3148procfsRdwr+000608 (??, ??, ??, ??, ??, ??, ??, ??)
  ￭005A8960vnop_rdwr+000820 (??, ??, ??, ??, ??, ??, ??, ??)
  ￭005BCCB4vno_rw+0000B4 (??, ??, ??, ??, ??)
  ￭005453E0rwuio+000100 (??, ??, ??, ??, ??, ??)
  ￭00545768rdwr+000188 (??, ??, ??, ??, ??, ??)
  ￭0054529Ckeread+00013C (??, ??, ??, ??)
  ￭00003850ovlya_addr_sc_flih_main+000130 ()
  ￭kdb_get_virtual_memory no real storage @ FFFFFFFFFFFC450
  
  where it is trying to access a vnode that's already been
  freed.
  

Local fix

Problem summary

• system crashed at prReadMmap when running fuser with stack
  trace similiar to
  (0)> f
  pvthread+026200 STACK:
   001F5840 prReadMmap+000220 (F1000A10299E5200,
  7777777777777777, 00000000000000B0, F1000A1000000170,
  F10001000800FF80, 0000000000000003, 0000000000001000,
  0004414E951D90CF  ?? )
   001F3148 procfsRdwr+000608 (??, ??, ??, ??, ??, ??, ??, ??)
   005A8960 vnop_rdwr+000820 (??, ??, ??, ??, ??, ??, ??, ??)
   005BCCB4 vno_rw+0000B4 (??, ??, ??, ??, ??)
   005453E0 rwuio+000100 (??, ??, ??, ??, ??, ??)
   00545768 rdwr+000188 (??, ??, ??, ??, ??, ??)
   0054529C keread+00013C (??, ??, ??, ??)
   00003850 ovlya_addr_sc_flih_main+000130 ()
   kdb_get_virtual_memory  no real storage @ FFFFFFFFFFFC450
  
  where it is trying to access a vnode that's already been
  freed.
  

Problem conclusion

• The code drop for this defect is not to resolve the crash
  completely.  It will make sure fuser will not crash the system
  when running in the gloabl. There is still a chance that fuser
  will crash the system if it is executed within a wpar
  environment.
  
  There will be another defect opened to resolve the entire
  fuser issue. UPT, please note that if you experienced a crash
  running fuser within a wpar, the defect will get dupped.
  Please do not make it HOT because we know it is a problem
  and we are working on a solution to resolve the problem.
  

Temporary fix

Comments

• 6100-04 - use AIX APAR IZ84048
  6100-05 - use AIX APAR IZ83921
  6100-06 - use AIX APAR IZ80838
  6100-06 - use AIX APAR IZ81097
  7100-00 - use AIX APAR IZ81769
  

APAR Information

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

  IZ80838

• 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 U835816

     UP11/05/10 I 1000

PTF to Fileset Mapping

• U835816 bos.rte.filesystem 6.1.6.15