IV21128: SYSTEM CRASH DUE TO FREED SOCKET WHEN SOCKETPAIR() CALL USED APPLIES TO AIX 6100-07

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• When socketpair calls are used on the system we could see
  a crash in socket code path (close, send, etc.) due to
  one
  of the sockets in the freelist.
  Stack could be something like,
  
  [00009514].simple_lock+000014 ()
  [0049EB08]unp_disconnect@AF32_12+000228 (??, ??, ??, ??,
   ??)
  [0049C574]uipc_usrreq+0005D4 (??, ??, ??, ??, ??)
  [004C75A8]sodisconn+0001A8 (??)
  [004C6DE4]soclose2+000BE4 (??, ??)
  [004C8070]soclose+000010 (??)
  [004D2734]soo_close+000294 (??)
  [00630F7C]closef+00005C (??)
  [00547890]closefd+000150 (??, ??)
  [00547C44]closex+000304 (??, ??)
  [00547EBC]close+00011C (??)
  [00003850]ovlya_addr_sc_flih_main+000130 ()
  [kdb_get_virtual_memory] no real storage @ 111694A50
  [900000000B192F4]0900000000B192F4 ()
  [kdb_read_mem] no real storage @ FFFFFFFFFFF6380
  
  This is because the socket in unp_conn is already freed.
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED:
  * Systems running the AIX 6100-07 Technology Level.
  *
  * Customers running Oracle RAC 11.2.0.3 or newer, with
  * Oracle Cluster Health Monitor (CHM), are likely to see
  * this problem.
  *
  ****************************************************************
  * PROBLEM DESCRIPTION:
  * System crash using socketpair() with a stack similar to:
  *
  *  00009514 .simple_lock+000014 ()
  *  0049EB08 unp_disconnect@AF32_12+000228 (??, ??, ??, ??, ??)
  *  0049C574 uipc_usrreq+0005D4 (??, ??, ??, ??, ??)
  *  004C75A8 sodisconn+0001A8 (??)
  *  004C6DE4 soclose2+000BE4 (??, ??)
  *  004C8070 soclose+000010 (??)
  *  004D2734 soo_close+000294 (??)
  *  00630F7C closef+00005C (??)
  *  00547890 closefd+000150 (??, ??)
  *  00547C44 closex+000304 (??, ??)
  *  00547EBC close+00011C (??)
  *  00003850 ovlya_addr_sc_flih_main+000130 ()
  *  kdb_get_virtual_memory  no real storage @ 111694A50
  *  900000000B192F4 0900000000B192F4 ()
  *  kdb_read_mem  no real storage @ FFFFFFFFFFF6380
  *
  * The application involved is likely to be multithreaded.
  ****************************************************************
  * RECOMMENDATION:
  * Install APAR IV21128.
  *
  * Prior to APAR availability, an interim fix is available from:
  * ftp://public.dhe.ibm.com:/aix/ifixes/iv21128/
  ****************************************************************
  

Problem conclusion

• The code in socketpair() system call modifid so that in
  multithreaded environment, another thread is not able to close
  one of the sockets during critical pairing phase.
  

Temporary fix

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

Comments

APAR Information

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

  IV16603

• 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 U850425

     UP12/07/16 I 1000

PTF to Fileset Mapping

• U850425 bos.mp64 6.1.7.16