Fixes are available
APAR status
Closed as program error.
Error description
Random memory corruptions may occur in the UNIX OS Agent while collecting metrics for the Disk group Affected Platforms / Versions: This issue affects all the UNIXX OS agent versions since 6.23 FP1 and it does not depend on the UNIX platform. Diagnostics: RAS1 logs at ERROR level show a sequence like this before ending: mount_stat.cpp,446,"get_mount_info") WARNING: The statvfs64 timeout expired! mount_stat.cpp,447,"get_mount_info") WARNING: The mounted file system "/example/file/system is probably unreachable . With more detailed RAS1 logging enabled, RAS logs will end with the thread for "exec_statvfs64": mount_stat.cpp,189,"exec_statvfs64") statvfs64 executed successfully for "/example/file/system" mount_stat.cpp,294,"exec_statvfs64") Exit: 0x0 . The traceback of the coring thread is variable as this issue is the result of memory corruption when the call to statvfs64() returns and the "exec_stavtfs64" thread exits, where the calling thread has previously timed out. . Initial Impact: High - monitoring agent crashes. . Additional Keywords: UNIXDISK core dump sigsegv mount_stat kuxagent Local Fix: Increase KBB_NFS_TIMEOUT to prevent timeout of statvfs64
Local fix
Increase KBB_NFS_TIMEOUT setting to larger value than the statfvs64 call takes to return. Set in lz.ini and value is specified in seconds.
Problem summary
Problem Description: The Monitoring Agent for UNIX OS may corrupt memory while monitoring disks. Problem/Problem Summary: A condition has been identified where the buffer containing data for a filesystem can be overridden by those for another filesystem. This memory corruption is caused by a timing condition between two agent internal threads and it may occur when one or more filesystems do not respond within the 2 seconds default timeout for the statvfs64 system call.
Problem conclusion
Fix/Problem Conclusion: Memory corruption avoided. The fix for this APAR will be contained in the following maintenance packages: | FixPack | 6.3.0-TIV-ITM-FP0007 | InterimFix | 6.3.0.5-TIV-ITM_UNIX-IF0004
Temporary fix
Comments
APAR Information
APAR number
IV80830
Reported component name
ITM AGENT UNIX
Reported component ID
5724C040U
Reported release
623
Status
CLOSED PER
PE
NoPE
HIPER
NoHIPER
Special Attention
NoSpecatt / Xsystem
Submitted date
2016-01-26
Closed date
2016-03-21
Last modified date
2016-03-21
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
[{"Business Unit":{"code":"BU059","label":"IBM Software w\/o TPS"},"Product":{"code":"SSTFXA","label":"Tivoli Monitoring"},"Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"623","Line of Business":{"code":"LOB45","label":"Automation"}}]
Document Information
Modified date:
08 March 2023