IZ79449: SYSTEM CRASH AFTER LOADING MANY KERNEL EXTENSIONS APPLIES TO AIX 6100-02

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• Problem is seen when a large number of kernel extensions
  are loaded.
  The customer may see a kernel crash as a result.
  Alternatively, over-writing of adjacent memory may cause
  problems later.
  
  Problem occurs when one bit is written outside a fixed
  size bit array.
  
  These are the Possible stack traces with this problem,
  but not limited to them:-
  
  >>> Case 1: system crash, the stack is
  [00705C28]set_cancelable_bitmap+0001C8 (0000000000000001,
  F100010008FDDF80, 0000000000000000, 0000000000000080
  [??])
  [007066E4]ld_syscall+0005E4 (??, ??)
  [00709874]ld_loadmodule+000494 (F00000002FF46170,
  F00000002FF463B8, 0000001F0000001F, 0000000700000007,
  F00000002FF463B9, F00000002FF46160)
  [0070E4A4]kmod_load+000304 (??, ??, ??, ??)
  [005BE988]load_kmod+000088 (??, ??, ??)
  [005BEE44]sysconfig+000104 (??, ??, ??)
  [00003850]ovlya_addr_sc_flih_main+000130 ()
  
  >>> Case 2: overwrite causes problems later
  One possible stack
  [00048148]rasp_get@AF102_43+0000C8 (7261737052415361
  [??])
  [0061D2D4]dmp_size+0001D4 (??)
  [0061C790]dmpioctl+000410 (??, ??, ??, ??)
  [004EF8C0]rdevioctl+0000C0 (??, ??, ??, ??, ??, ??)
  [006A46E0]spec_ioctl+000080 (??, ??, ??, ??, ??, ??)
  [00550D90]vnop_ioctl+000050 (??, ??, ??, ??, ??, ??)
  [005631DC]vno_ioctl+00009C (??, ??, ??, ??, ??)
  [005ED398]common_ioctl+0000F8 (??, ??, ??, ??)
  [00003850]ovlya_addr_sc_flih_main+000130 ()
  
  Another possible stack:
  [0001BF00]abend_trap+000000 ()
  [00048AEC]rasp_apply_all_children@AF105_11+00014C (??,
  ??, ??, ??, ??, ??)
  [00045BEC]rasp_apply_all_children+00002C (??, ??, ??, ??,
  ??)
  [00048A64]rasp_apply_all_children@AF105_11+0000C4 (??,
  ??, ??, ??, ??, ??)
  [00045BEC]rasp_apply_all_children+00002C (??, ??, ??, ??,
  ??)
  [00046DE4]rasp_apply_all+000064 (??, ??, ??)
  [0004C4A8]rasp_setsystrc_onoff+000028 ()
  [09E37990]trchk_init+000070 (??, ??)
  [09E31A2C]trcon+00016C (??)
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED:
  * Users of the 6100-02 Technology Level with the bos.mp64
  * fileset below the level of 6.1.2.9.
  ****************************************************************
  * PROBLEM DESCRIPTION:
  * Possible system crash when loading many kernel extensions.
  * The stack trace would be similar to:
  *   abend_trap+000000
  *   rasp_apply_all_children@AF105_11+00014C
  *   rasp_apply_all_children+00002C
  *   set_cancelable_bitmap+000108
  *   ld_syscall+000640
  * Other symptoms are possible.
  ****************************************************************
  * RECOMMENDATION:
  * Install APAR IZ79449.
  ****************************************************************
  

Problem conclusion

• Increase size of a bit array used when kernel extensions are
  loaded.
  

Temporary fix

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

Comments

• 5300-09 - use AIX APAR IZ82256
  5300-10 - use AIX APAR IZ76975
  5300-11 - use AIX APAR IZ76983
  5300-12 - use AIX APAR IZ81668
  6100-02 - use AIX APAR IZ79449
  6100-03 - use AIX APAR IZ79440
  6100-04 - use AIX APAR IZ75112
  6100-05 - use AIX APAR IZ78570
  6100-06 - use AIX APAR IZ77045
  6100-06 - use AIX APAR IZ76482
  6100-06 - use AIX APAR IZ77045
  7100-00 - use AIX APAR IZ82129
  

APAR Information

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

  IZ75112

• 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 U835851

     UP10/08/24 I 1000

PTF to Fileset Mapping

• U835851 bos.mp64 6.1.2.9