IV35898: ABSTRACT: HIGH CPU IN UNIX AGENT ON SOLARIS IN THE MOUNT_STAT PROCESS

IBM Tivoli Monitoring 6.2.3 Fix Pack 4 (6.2.3-TIV-ITM-FP0004)
IBM Tivoli Monitoring: UNIX OS Agent 6.2.3.2-TIV-ITM_UNIX-IF0002

APAR status

• Closed as program error.

Error description

• Severity: 2
  
  Approver: FS
  Compid: 5724C040U
  Abstract: High CPU in Unix Agent on Solaris in the mount_stat
  process
  
  Environment: Monitoring Agent for Unix OS 6.23fp2 on Solaris
  
  Problem Description:
  In the Unix Agent on Solaris, retrieving the data for the
  Solaris zones, the agent can experiments high cpu in mount_stat
  process due to an hang in trying to determine the
  mountPointSpecial values.
  
  Detailed Recreation Procedure: It depends on the Solaris zones
  configuration.
  
  Related Files and Output:
  The minimum trace settings to show this problem is ERROR
  (UNIT:mount_stat ALL)
   This problem is showed in the mount_stat log by the presence
  of:
  
   (50F0CAA3.0001-209C1:mount_stat.cpp,251,"exec_statvfs64")
  _zfs_open
  failed...
   (50F0CAA3.0002-209C2:mount_stat.cpp,251,"exec_statvfs64")
  _zfs_open
  failed...
   (50F0CAA3.0003-209C3:mount_stat.cpp,251,"exec_statvfs64")
  _zfs_open
  failed...
   (50F0CAA3.0004-209C4:mount_stat.cpp,251,"exec_statvfs64")
  _zfs_open
  failed...
   (50F0CAA3.0005-209C5:mount_stat.cpp,251,"exec_statvfs64")
  _zfs_open
  failed...
  
  where the exec_statvfs64 is ran many values (see the thread id
  ever differnt).
  
  This behavior is due to a problem in the function
  getMountPointSpecial that is shown in the stack in this way:
  
  ------------------  lwp# 2204947 / thread# 2204947
  
    ffffffff7d8dbf34 ioctl (ffffffff7da497b8, ffffffff7a8fbda0,
  ffffffff7a8fbc78, 1e95c4, 0, ffffffff7da3e000) + c
    00000001000152d0 __1cUgetMountPointSpecial6Fpc_0_ (1007c8f90,
  1000312e3, ffffffffffffffff, 10, 73, 73) + 1b0
  
    0000000100015730 __1cOexec_statvfs646Fpv_0_ (1001ab740,
  1fc000, 0, 0,
  100015438, 1) + 2f8
    ffffffff7d8d8558 _lwp_start (0, 0, 0, 0, 0, 0)
  ============================================================
  

Local fix

Problem summary

• Problem Summary: ITM Unix OS Agent on Solaris local zones
  can experiment high cpu in mount_stat process, due to a hang
  while collecting mountPointSpecial value for ZFS filesystems.
  

Problem conclusion

• The code has been changed in order to avoid hangs in case of
  failures of getmntent API, while getting mountPointSpecial
  values.
  
  The fix for this APAR will be contained in the following
  maintenance package:
  
  | FixPack | 6.2.3-TIV-ITM-FP0004
  

Temporary fix

Comments

APAR Information

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

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

Fix information

• Fixed component name

  ITM AGENT UNIX

• Fixed component ID

  5724C040U

Applicable component levels

• R623 PSY

     UP

• R630 PSY

     UP

• R610 PSN

     UP

• R620 PSN

     UP

• R621 PSN

     UP

• R622 PSN

     UP