IJ06228: _ATFORK_PREPARE HANG WITHOUT LDAP APPLIES TO AIX 7100-05 18/09/24 PTF PECHANGE

APAR status

• Closed as program error.

Error description

• A hang may occur in a multithreaded process that is
  forking child processes.
  
  One thread will be seen hung in _atfork_prepare:
  
  [0010B7B0]e_block_thread+000290 ()
  [001B8A40]nsleep_com+0000C0 (??)
  [001B9864]nsleep+000064 (??, ??)
  [00003938]syscall+000230 ()
  [90000000058090C]_p_nsleep+00000C (??, ??)
  [900000000039564]nsleep+0000E4 (??, ??)
  [900000000038F54]usleep+0000D4 (??)
  [90000000003F780]_libc_pre_fork+000260 ()
  [90000000058D13C]_atfork_prepare+0001BC ()
  [90000000010F63C]__fork+00003C ()
  
  Whereas another will likely be seen waiting on a rwlock:
  
  [90000000057B840]_event_sleep+000580 (??, ??, ??, ??,
   ??, ??)
  [90000000057C344]_event_wait+000344 (??, ??)
  [900000000590270]_rwlock_wait_local+000110 (??, ??,
  ??)
  [90000000059010C]_rwlock_wait+0000AC (??, ??, ??)
  [900000000590ED4]_rwlock_wrlock+0002B4 (??, ??, ??)
  [90000000006F144]method_getentry+000204 (??, ??, ??,
  ??, ??)
  [900000000085488]__method_getentry_v2+0001A8 (??, ??,
  ??, ??, ??, ??)
  [9000000000F331C]process_module+00019C (??, ??, ??, ??
  , ??)
  [9000000000F4218]getconfattrs+0006B8 (??, ??, ??)
  [9000000000F47C0]getconfattr+000260 (??, ??, ??, ??)
  [900000000088A78]getuserattrs+001998 (??, ??, ??)
  [9000000000F7658]getuserattr+000338 (??, ??, ??, ??)
  [9000000001F1ECC]loginsuccess+0000CC (??, ??, ??, ??)
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED:
  * Systems running the 7100-05 Technology Level with
  * any of the following filesets at or between the given levels:
  * MIN          MAX          FILESET
  * 7.1.5.0      7.1.5.17     bos.64bit
  * 7.1.5.0      7.1.5.17     bos.adt.prof
  * 7.1.5.0      7.1.5.16     bos.rte.control
  * 7.1.5.0      7.1.5.17     bos.rte.libc
  * 7.1.5.0      7.1.5.16     bos.rte.shell
  * 7.1.5.0      7.1.5.17     mcr.rte
  ****************************************************************
  * PROBLEM DESCRIPTION:
  * A hang may occur in a multithreaded process that is
  *  forking child processes.
  * One thread will be seen hung in _atfork_prepare:
  *  0010B7B0 e_block_thread+000290 ()
  *  001B8A40 nsleep_com+0000C0 (??)
  *  001B9864 nsleep+000064 (??, ??)
  *  00003938 syscall+000230 ()
  *  90000000058090C _p_nsleep+00000C (??, ??)
  *  900000000039564 nsleep+0000E4 (??, ??)
  *  900000000038F54 usleep+0000D4 (??)
  *  90000000003F780 _libc_pre_fork+000260 ()
  *  90000000058D13C _atfork_prepare+0001BC ()
  *  90000000010F63C __fork+00003C ()
  * Whereas another will likely be seen waiting on a rwlock:
  *  90000000057B840 _event_sleep+000580 (??, ??, ??, ??,
  *  ??, ??)
  *  90000000057C344 _event_wait+000344 (??, ??)
  *  900000000590270 _rwlock_wait_local+000110 (??, ??,
  * ??)
  *  90000000059010C _rwlock_wait+0000AC (??, ??, ??)
  *  900000000590ED4 _rwlock_wrlock+0002B4 (??, ??, ??)
  *  90000000006F144 method_getentry+000204 (??, ??, ??,
  * ??, ??)
  *  900000000085488 __method_getentry_v2+0001A8 (??, ??,
  * ??, ??, ??, ??)
  *  9000000000F331C process_module+00019C (??, ??, ??, ??
  * , ??)
  *  9000000000F4218 getconfattrs+0006B8 (??, ??, ??)
  *  9000000000F47C0 getconfattr+000260 (??, ??, ??, ??)
  *  900000000088A78 getuserattrs+001998 (??, ??, ??)
  *  9000000000F7658 getuserattr+000338 (??, ??, ??, ??)
  *  9000000001F1ECC loginsuccess+0000CC (??, ??, ??, ??)
  ****************************************************************
  * RECOMMENDATION:
  * Install APAR IJ06228.
  ****************************************************************
  

Problem conclusion

• The relevant code in libs was modified to appropriately handle
  multi-threaded applications.
  

Temporary fix

Comments

• 6100-09 - use AIX APAR IJ06511
  7100-05 - use AIX APAR IJ06228
  7200-03 - use AIX APAR IJ06902
  

APAR Information

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

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

  IJ06511 IJ06584 IJ06718 IJ06777 IJ06902

Fix information

• Fixed component name

  AIX V7.1

• Fixed component ID

  5765H4000

Applicable component levels

• R710 PSY U882520

     UP18/09/25 I 1000 Ø