A fix is available
APAR status
Closed as program error.
Error description
AIO deadlock when the user code changes priority (setpri) on the user process while the aio threads are working. This is a rare timing issue. The hang can look something like (12)> f 195 pvthread+006180 STACK: [002ADE8C]slock_ppc+00043C (0054079C, 00001080 [??]) [00009554].simple_lock+000054 () [02BD5248]suspend_it+000060 (??, ??, ??, ??, ??, ??) [02BD53DC]suspend_set+0000C4 (??, ??, ??, ??, ??, ??, ??) [02BD0D5C]posix_iosuspend_common+0000E8 (??, ??, ??, ??) [02BCFF80]_posix_iosuspend+000190 (??, ??, ??) [00003B3C].sys_call+000000 () [kdb_get_memory] no real storage @ 314838A8
Local fix
Issue setpri for the all processes before issuing any AIO operations.
Problem summary
Threads can hang, if the priority of it is changed while aio request is in progress with following stack trace 002ADE8C slock_ppc+00043C (0054079C, 00001080 ?? ) 00009554 .simple_lock+000054 () 02BD5248 posix_aio.ext:suspend_it+000060 (??, ??, ??, ??, ??, ??) 02BD53DC posix_aio.ext:suspend_set+0000C4 (??, ??, ??, ??, ??, ??, ??) 02BD0D5C posix_aio.ext:posix_iosuspend_common+0000E8 (??, ??, ??, ??) 02BCFF80 posix_aio.ext:_posix_iosuspend+000190 (??, ??, ??) 00003B3C .sys_call+000000 ()
Problem conclusion
keep record of the locks acquired
Temporary fix
Comments
APAR Information
APAR number
IZ66336
Reported component name
AIX 5.3
Reported component ID
5765G0300
Reported release
530
Status
CLOSED PER
PE
NoPE
HIPER
NoHIPER
Submitted date
2009-12-03
Closed date
2010-01-15
Last modified date
2013-03-29
APAR is sysrouted FROM one or more of the following:
APAR is sysrouted TO one or more of the following:
IZ68409 IZ69667 IZ69837 IZ69944 IZ70019 IZ70024 IZ71119 IZ71443
IZ71674 IZ71896
Fix information
Fixed component name
AIX 5.3
Fixed component ID
5765G0300
Applicable component levels
R530 PSY U830214
UP10/03/23 I 1000
PTF to Fileset Mapping
U830214 bos.rte.aio 5.3.9.4
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Document Information
Modified date:
29 March 2013