IV95590: SYSTEM CRASH WHEN USING PROCFS FOR PROCESSES CLOSING MANY FILES APPLIES TO AIX 7200-01

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• **************************************************************
  * USERS AFFECTED:
  * Systems running the AIX 7200-01 Technology Level
  * with bos.mp64 at the 7.2.1.3 level and below.
    **************************************************************
  * ERROR DESCRIPTION:
  * If procfs /proc/<pid>/fd/ directory is accessed for a
  * process that uses many file descriptors, the LPAR my crash
  * due to bad values in the application stack data.
  * This occurs when the application closes many file
  * descriptors all at once while at the same time the procfs
  * data in /proc/<pid>/fd/ is being accessed.
  *
  * This has been most commonly seen when the 'fuser' command is
  * run while an application is running that opens and closes
  * many files during its execution.
  * The crash can have varied symptoms, but in one common case
  * the stack looks like:
  * (0)> f
  * pvthread+018000 STACK:
  * 000039B4 .sys_call_ret+000078 ()
  * 00003958 .sys_call_ret+00001C ()
    **************************************************************
  * RECOMMENDATION:
  * Install APAR IV95590.
  * Prior to fix availability, an interim fix is available from
  * either
  * ftp://aix.software.ibm.com/aix/ifixes/iv95590/
  * https://aix.software.ibm.com/aix/ifixes/iv95590/
  * The ifix can be installed using Live Update (LU).
  * If LU is not used, installation of the ifix requires a
  * reboot.
    **************************************************************
  

Local fix

Problem summary

• System crash with following stack:
  (0)> f
  pvthread+018000 STACK:
   000039B4 .sys_call_ret+000078 ()
   00003958 .sys_call_ret+00001C ()
  uninitialized stack variable content access to write
  reulted in corruption of mst/other u-block area.
  

Problem conclusion

• Change the code to avoid this corruption.
  

Temporary fix

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

Comments

APAR Information

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

  IV92812

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

Fix information

• Fixed component name

  AIX V7.2

• Fixed component ID

  5765CD200

Applicable component levels

• R720 PSY U873438

     UP17/09/21 I 1000 Ž

PTF to Fileset Mapping

• U873438 bos.mp64 7.2.1.4