A fix is available
APAR status
Closed as program error.
Error description
In some situations xlate_unpin can return EINVAL which causes unpin_buf to assert. The stack trace in such a case will be (6)> f pvthread+810300 STACK: [001C7158]unpin_buf+00002C (0000000000000016, 0000000000000016 [??]) [001C7064]uphyswait+0001F0 (??, ??, ??, ??) [00472BEC]uphysio+000474 (??, ??, ??, ??, ??, ??, ??) [04057520]scsidisk_rdwr+0000DC (??, ??, ??, ??, ??) [04057778]scsidisk_read+000080 (??, ??, ??, ??) [003F077C]rdevread+0000A8 (??, ??, ??, ??) [005267C8]cdev_rdwr+0000C8 (??, ??, ??, ??, ??, ??, ??) [004C5D04]spec_rdwr+00010C (??, ??, ??, ??, ??, ??, ??, ??) [00404528]vnop_rdwr+00019C (??, ??, ??, ??, ??, ??, ??, ??) [00447DAC]vno_rw+00006C (??, ??, ??, ??) [003D5024]fp_rwuio+0000B4 (??, ??, ??, ??) [0456CCE0]rw_request+00016C (??, ??) [0456C96C]process_request+000090 (??, ??) [0456CB1C]process_queue+000048 (??) [0456CF10]do_requests+000038 (??) [0456D13C]server_main+000158 (??, ??, ??) [0016E350]procentry+000010 (??, ??, ??, ??)
Local fix
There is no fix. System will reboot.
Problem summary
When a XMEM descriptor spans multiple segments with different page sizes, with the first segment having the largest page size, and the size of the XMEM buffer is a multiple of the smallest page size, and the buffer does not start on the smallest page size's boundary, the number of physical pages spanned recorded in the XMEM descriptor during pinning is incorrect.
Problem conclusion
Correctly calculate the number of pages spanned by the buffer.
Temporary fix
Comments
5300-09 - use AIX APAR IZ82778 5300-10 - use AIX APAR IZ82639 5300-11 - use AIX APAR IZ82751 5300-12 - use AIX APAR IZ82454 6100-03 - use AIX APAR IZ87711 6100-04 - use AIX APAR IZ87678 6100-05 - use AIX APAR IZ87603 6100-06 - use AIX APAR IZ83295 7100-00 - use AIX APAR IZ84272
APAR Information
APAR number
IZ83295
Reported component name
AIX 610 STD EDI
Reported component ID
5765G6200
Reported release
610
Status
CLOSED PER
PE
NoPE
HIPER
NoHIPER
Submitted date
2010-08-22
Closed date
2010-08-22
Last modified date
2013-04-17
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
AIX 610 STD EDI
Fixed component ID
5765G6200
Applicable component levels
R610 PSY U833973
UP11/05/13 I 1000
PTF to Fileset Mapping
U833973 bos.mp64 6.1.6.15
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Document Information
Modified date:
17 April 2013