A fix is available
APAR status
Closed as program error.
Error description
When a process trying to allocate huge amount of memory using the calls like malloc or calloc, it is possible that these calls may fail upon hitting the one of the resource limit like paging space, pinned memory etc ... In the failure case these calls may take longer time to return back to user with error number. During these longer periods before returning back to user, the thread stack of the process may look like:- (0)> stack 40210 pvthread+9D1200 STACK: Use current context [F00000002FF47600] of cpu 126 [005C0C30]shm_findsptrx+0000F0 (0000000000000000, F000000020000000,F00000002FF47270 [??]) [005C0658]shm_removex+000018 (??, ??, ??) [005C0E28]shm_deletex+000048 (??, ??) [0063D5C4]_brk64+0003C4 (??, ??) [0063F288]_sbrk64+000068 (??) [0063D1B8]__sbrk+000238 (??) [00003850]ovlya_addr_sc_flih_main+000130 () [90000000000F5DC]extend_brk+00005C (??, ??, ??) [9000000000A85A0]malloc_y+0003A0 (002386F26FC0FFFF, 0000000000000000,09001000A0AB1530, 09001000A0A3FA80, 3FFC000000000003,000000000001BA80, 0000000000000000, 0000000000000000) [900000000010F48]malloc_common@AF102_86+000028 (??) [900000000010CD4]malloc+0000D4 (??) [9000000000103DC]calloc_common+00003C (??, ??) [90000000000EFE4]init_calloc+000044 (??, ??) [900000000010DA8]calloc+000028 (??, ??) [1000004F8]fopen_custom_buffer_size+000098 (??) [1000006C8]main+000088 (??, ??, ??) [1000002B0]__start+000070 ()
Local fix
Set the data limit using ulimit to avoid performance degradation with malloc/calloc failures. Same can be achieved by setting MAXDATA with LDR_CNTRL process environment variable
Problem summary
A process takes an abnormally large time to exit after a failed huge memory allocation. kdb would show the process spending most of its time in shm_findsptr64x().
Problem conclusion
Improve the hinting algorithm to catch a corner case.
Temporary fix
Comments
6100-09 - use AIX APAR IV66299 7100-03 - use AIX APAR IV45149
APAR Information
APAR number
IV66299
Reported component name
AIX 610 STD EDI
Reported component ID
5765G6200
Reported release
610
Status
CLOSED PER
PE
NoPE
HIPER
NoHIPER
Submitted date
2014-10-27
Closed date
2014-10-27
Last modified date
2015-11-22
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 U861403
UP15/11/22 I 1000
PTF to Fileset Mapping
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Document Information
Modified date:
17 December 2021