IV88366: FUSER/PROCFILES COMMAND MAY STUCK IN AN ENDLESS LOOP APPLIES TO AIX 7100-03 17/01/27 PTF PECHANGE

APAR status

• Closed as program error.

Error description

• The fuser command may stuck in an endless loop.
  Using truss -p <fuser PID> will show that fuser
  is working on the same files over and over again.
  Example:
  getdirent(3, 0x000000012BD1E890, 1024) = 816
  <snip>
  statx("/proc/10223694/fd/106",...)
  statfs("/proc/10223694/fd/106",...)
  statx("/proc/10223694/fd/109",...)
  statfs("/proc/10223694/fd/109",...)
  getdirent(3, 0x000000012BD1E890, 1024) = 1008
  statx("/proc/10223694/fd/0",...)
  statfs("/proc/10223694/fd/0",...)
  statx("/proc/10223694/fd/1",...)
  statfs("/proc/10223694/fd/1",...)
  <snap>
  statx("/proc/10223694/fd/106",...)
  statfs("/proc/10223694/fd/106",...)
  statx("/proc/10223694/fd/109",...)
  statfs("/proc/10223694/fd/109",...)
  getdirent(3, 0x000000012BD1E890, 1024) = 1008
  statx("/proc/10223694/fd/0",...)
  <snip>
  In this case the command
  procfiles 10223694
  will loop as well.
  

Local fix

• For the fuser command:
  export FUSER_VERSION=1
  run the command/script executing fuser
  unset FUSER_VERSION
  No workaround for procfiles.
  

Problem summary

• ****************************************************************
  * USERS AFFECTED:
  * Systems running the 7100-03 Technology Level with
  * bos.mp64 at or between 7.1.3.15 and 7.1.3.48
  ****************************************************************
  * PROBLEM DESCRIPTION:
  * The fuser command may stuck in an endless loop.
  * Using truss -p <fuser PID> will show that fuser
  * is working on the same files over and over again.
  * Example:
  * getdirent(3, 0x000000012BD1E890, 1024) = 816
  * <snip>
  * statx("/proc/10223694/fd/106",...)
  * statfs("/proc/10223694/fd/106",...)
  * statx("/proc/10223694/fd/109",...)
  * statfs("/proc/10223694/fd/109",...)
  * getdirent(3, 0x000000012BD1E890, 1024) = 1008
  * statx("/proc/10223694/fd/0",...)
  * statfs("/proc/10223694/fd/0",...)
  * statx("/proc/10223694/fd/1",...)
  * statfs("/proc/10223694/fd/1",...)
  * <snap>
  * statx("/proc/10223694/fd/106",...)
  * statfs("/proc/10223694/fd/106",...)
  * statx("/proc/10223694/fd/109",...)
  * statfs("/proc/10223694/fd/109",...)
  * getdirent(3, 0x000000012BD1E890, 1024) = 1008
  * statx("/proc/10223694/fd/0",...)
  * <snip>
  * In this case the command
  * procfiles 10223694
  * will loop as well.
  ****************************************************************
  * RECOMMENDATION:
  * Install APAR IV88366.
  ****************************************************************
  

Problem conclusion

• offset caluclation is changed  in such a way that it is
  dependent on the last filename that was returned.
  

Temporary fix

Comments

• 6100-09 - use AIX APAR IV74403
  7100-04 - use AIX APAR IV73971
  

APAR Information

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

  IV73971

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

  002PC0Ÿ

Fix information

• Fixed component name

  AIX V7.1

• Fixed component ID

  5765H4000

Applicable component levels

• R710 PSY U872346

     UP17/01/19 I 1000