A fix is available
APAR status
Closed as program error.
Error description
A dead lock can occur when working with internal jfs2 shapshots As a result commands on the associated jfs2 filesystem can hang. Both kernel stacks involved with dead lock will contain the function siWriterReadSMap with stacks similar to: (0)> f 190 pvthread+00BE00 STACK: [000E47F8]e_block_thread+000298 () [000E5368]e_sleep_thread+0000E8 (??, ??, ??) [002A76D8]bmAssign+000778 (??, ??, ??, ??, ??, ??) [002A6960]bmRead+0000A0 (??, ??, ??, ??, ??, ??) [00303BD4]xtSearch+0005D4 (??, ??, ??, ??, ??) [002C4F88]siWriterReadSMap+000348 (F10001023D4CA880, 0000000001ACC0A0,0FFFFFFFF4FA7B48, 0000000000000000) [002C4720]siCOWLookupSMap+000060 (??, ??, ??, ??, ??) [002CCC70]siCOW+000270 (??, ??) [002BBB9C]j2PagerService+00051C (??) [002B7954]j2PagerThread+0001F4 (??) [00387774]threadentry+000094 (??, ??, ??, ??) [kdb_read_mem] no real storage @ FFFFFFFFFFF8D30 and 0> f 81 [00574454]complex_lock_sleep_ppc+0001D4 (0000000000574454, 8000000000001032, 0000000088024024, 0FFFFFFFF42B7670 [??]) [005763C0]lock_write_ppc+0001A0 (??) [002C5048]siWriterReadSMap+000408 (F10001023D4CA880, 00000000032C8BA0, 0FFFFFFFF42B7B48, 0000000000000000) [002C4720]siCOWLookupSMap+000060 (??, ??, ??, ??, ??) [002CCC70]siCOW+000270 (??, ??) [002BBB9C]j2PagerService+00051C (??) [002B7954]j2PagerThread+0001F4 (??) [00387774]threadentry+000094 (??, ??, ??, ??) [kdb_read_mem] no real storage @ FFFFFFFFFFF8D30 Code changes in IV29780 with abstract: Deadlock hang in snapshot code doing chdir and remove operations causes the race condition which can lead to this deadlock
Local fix
Work around is to use external snapshot instead of internal snapshots
Problem summary
Database begins blocking on writes. Slowly brings IO to a stop.
Problem conclusion
Change locking serialization
Temporary fix
Comments
6100-07 - use AIX APAR IV58198 6100-08 - use AIX APAR IV46121 6100-09 - use AIX APAR IV56153 6100-09 - use AIX APAR IV56153 6100-09 - use AIX APAR IV56153 7100-01 - use AIX APAR IV57482 7100-02 - use AIX APAR IV56225 7100-03 - use AIX APAR IV56142 7100-04 - use AIX APAR IV56171
APAR Information
APAR number
IV56171
Reported component name
AIX V7.1
Reported component ID
5765H4000
Reported release
710
Status
CLOSED PER
PE
NoPE
HIPER
NoHIPER
Submitted date
2014-03-03
Closed date
2014-03-03
Last modified date
2016-05-10
APAR is sysrouted FROM one or more of the following:
APAR is sysrouted TO one or more of the following:
U871189
Fix information
Fixed component name
AIX V7.1
Fixed component ID
5765H4000
Applicable component levels
R710 PSY U871189
UP15/11/22 I 1000
[{"Business Unit":{"code":"BU054","label":"Systems w\/TPS"},"Product":{"code":"SSMV87","label":"AIX 6.1 Enterprise Edition"},"Component":"","ARM Category":[],"Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"710","Edition":"","Line of Business":{"code":"LOB08","label":"Cognitive Systems"}},{"Business Unit":{"code":"BU058","label":"IBM Infrastructure w\/TPS"},"Product":{"code":"SSMVAX","label":"AIX Express Edition"},"Component":"","ARM Category":[],"Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"710","Edition":"","Line of Business":{"code":"LOB08","label":"Cognitive Systems"}},{"Business Unit":{"code":"BU054","label":"Systems w\/TPS"},"Product":{"code":"SG11R","label":"AIX 7.1 HIPERS, APARs and Fixes"},"Component":"","ARM Category":[],"Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"710","Edition":"","Line of Business":{"code":"","label":""}}]
Document Information
Modified date:
10 May 2016