A fix is available
APAR status
Closed as program error.
Error description
AIX NFS client with automount setup could crash system if a namefs mount over autofs is triggered. This happens if the NFS server does not respond to the mount operation thereby causing the namefs over autofs (instead of namefs over NFS over autofs). . The crash is due to stack overflow which in turn is due to an endless VNOP calls between autofs and LFS/NAMEFS. . Stack trace could look like (the VNOP operation could be different): (0)> f pvthread+02AE00 STACK: [07BB2720]auto_dprint+000000 (0000000000000004, 0000000007BC8BD0, 0000000002AE00BD, F100011009668850, F1000110080FD910, 0000000007BC55F0, F100011009668850, 0000000007BCA608) [07BBDDA8]auto_trigger_mount+0000E8 (??, ??, ??) [07BC2DBC]auto_setattr+00007C (??, ??, ??, ??) [07BAA04C]aix2onc_setattr+00026C (??, ??, ??, ??, ??, ??) [005C36A8]vnop_setattr+000308 (??, ??, ??, ??, ??, ??) [005C36A8]vnop_setattr+000308 (??, ??, ??, ??, ??, ??) [07BC4174]VOP_SETATTR+0002B4 (??, ??, ??, ??) [07BC2F0C]auto_setattr+0001CC (??, ??, ??, ??) [07BAA04C]aix2onc_setattr+00026C (??, ??, ??, ??, ??, ??) [005C36A8]vnop_setattr+000308 (??, ??, ??, ??, ??, ??) [005C36A8]vnop_setattr+000308 (??, ??, ??, ??, ??, ??) [07BC4174]VOP_SETATTR+0002B4 (??, ??, ??, ??) [07BC2F0C]auto_setattr+0001CC (??, ??, ??, ??) [07BAA04C]aix2onc_setattr+00026C (??, ??, ??, ??, ??, ??) [005C36A8]vnop_setattr+000308 (??, ??, ??, ??, ??, ??) [005C36A8]vnop_setattr+000308 (??, ??, ??, ??, ??, ??) [07BC4174]VOP_SETATTR+0002B4 (??, ??, ??, ??) [07BC2F0C]auto_setattr+0001CC (??, ??, ??, ??) [07BAA04C]aix2onc_setattr+00026C (??, ??, ??, ??, ??, ??) [005C36A8]vnop_setattr+000308 (??, ??, ??, ??, ??, ??) [005C36A8]vnop_setattr+000308 (??, ??, ??, ??, ??, ??) [07BC4174]VOP_SETATTR+0002B4 (??, ??, ??, ??) [07BC2F0C]auto_setattr+0001CC (??, ??, ??, ??) [07BAA04C]aix2onc_setattr+00026C (??, ??, ??, ??, ??, ??) [005C36A8]vnop_setattr+000308 (??, ??, ??, ??, ??, ??) [005C36A8]vnop_setattr+000308 (??, ??, ??, ??, ??, ??) [07BC4174]VOP_SETATTR+0002B4 (??, ??, ??, ??) [07BC2F0C]auto_setattr+0001CC (??, ??, ??, ??) [07BAA04C]aix2onc_setattr+00026C (??, ??, ??, ??, ??, ??) [005C36A8]vnop_setattr+000308 (??, ??, ??, ??, ??, ??) [005C36A8]vnop_setattr+000308 (??, ??, ??, ??, ??, ??) [07BC4174]VOP_SETATTR+0002B4 (??, ??, ??, ??) [07BC2F0C]auto_setattr+0001CC (??, ??, ??, ??) [07BAA04C]aix2onc_setattr+00026C (??, ??, ??, ??, ??, ??) [005C36A8]vnop_setattr+000308 (??, ??, ??, ??, ??, ??) [005C36A8]vnop_setattr+000308 (??, ??, ??, ??, ??, ??) [07BC4174]VOP_SETATTR+0002B4 (??, ??, ??, ??) [07BC2F0C]auto_setattr+0001CC (??, ??, ??, ??) [07BAA04C]aix2onc_setattr+00026C (??, ??, ??, ??, ??, ??) [005C36A8]vnop_setattr+000308 (??, ??, ??, ??, ??, ??) [005C36A8]vnop_setattr+000308 (??, ??, ??, ??, ??, ??) [07BC4174]VOP_SETATTR+0002B4 (??, ??, ??, ??) [07BC2F0C]auto_setattr+0001CC (??, ??, ??, ??) [07BAA04C]aix2onc_setattr+00026C (??, ??, ??, ??, ??, ??) [005C36A8]vnop_setattr+000308 (??, ??, ??, ??, ??, ??) .. ...
Local fix
Do not use namefs mounts over autofs triggered paths.
Problem summary
A system crash with a similar stack trace (0)> f pvthread+02AE00 STACK: 07BB2720 auto_dprint+000000 (0000000000000004, 0000000007BC8BD0, 0000000002AE00BD, F100011009668850, F1000110080FD910, 0000000007BC55F0, F100011009668850, 0000000007BCA608) 07BBDDA8 auto_trigger_mount+0000E8 (??, ??, ??) 07BC2DBC auto_setattr+00007C (??, ??, ??, ??) 07BAA04C aix2onc_setattr+00026C (??, ??, ??, ??, ??, ??) 005C36A8 vnop_setattr+000308 (??, ??, ??, ??, ??, ??) 005C36A8 vnop_setattr+000308 (??, ??, ??, ??, ??, ??) 07BC4174 VOP_SETATTR+0002B4 (??, ??, ??, ??) 07BC2F0C auto_setattr+0001CC (??, ??, ??, ??) 07BAA04C aix2onc_setattr+00026C (??, ??, ??, ??, ??, ??) 005C36A8 vnop_setattr+000308 (??, ??, ??, ??, ??, ??) 005C36A8 vnop_setattr+000308 (??, ??, ??, ??, ??, ??) 07BC4174 VOP_SETATTR+0002B4 (??, ??, ??, ??) 07BC2F0C auto_setattr+0001CC (??, ??, ??, ??) 07BAA04C aix2onc_setattr+00026C (??, ??, ??, ??, ??, ??) 005C36A8 vnop_setattr+000308 (??, ??, ??, ??, ??, ??) 005C36A8 vnop_setattr+000308 (??, ??, ??, ??, ??, ??) 07BC4174 VOP_SETATTR+0002B4 (??, ??, ??, ??) 07BC2F0C auto_setattr+0001CC (??, ??, ??, ??) 07BAA04C aix2onc_setattr+00026C (??, ??, ??, ??, ??, ??) 005C36A8 vnop_setattr+000308 (??, ??, ??, ??, ??, ??) 005C36A8 vnop_setattr+000308 (??, ??, ??, ??, ??, ??) 07BC4174 VOP_SETATTR+0002B4 (??, ??, ??, ??) 07BC2F0C auto_setattr+0001CC (??, ??, ??, ??) 07BAA04C aix2onc_setattr+00026C (??, ??, ??, ??, ??, ??) 005C36A8 vnop_setattr+000308 (??, ??, ??, ??, ??, ??) 005C36A8 vnop_setattr+000308 (??, ??, ??, ??, ??, ??) 07BC4174 VOP_SETATTR+0002B4 (??, ??, ??, ??) 07BC2F0C auto_setattr+0001CC (??, ??, ??, ??) 07BAA04C aix2onc_setattr+00026C (??, ??, ??, ??, ??, ??) 005C36A8 vnop_setattr+000308 (??, ??, ??, ??, ??, ??) 005C36A8 vnop_setattr+000308 (??, ??, ??, ??, ??, ??) 07BC4174 VOP_SETATTR+0002B4 (??, ??, ??, ??) 07BC2F0C auto_setattr+0001CC (??, ??, ??, ??) 07BAA04C aix2onc_setattr+00026C (??, ??, ??, ??, ??, ??) 005C36A8 vnop_setattr+000308 (??, ??, ??, ??, ??, ??) 005C36A8 vnop_setattr+000308 (??, ??, ??, ??, ??, ??) 07BC4174 VOP_SETATTR+0002B4 (??, ??, ??, ??) 07BC2F0C auto_setattr+0001CC (??, ??, ??, ??) 07BAA04C aix2onc_setattr+00026C (??, ??, ??, ??, ??, ??) 005C36A8 vnop_setattr+000308 (??, ??, ??, ??, ??, ??) 005C36A8 vnop_setattr+000308 (??, ??, ??, ??, ??, ??) 07BC4174 VOP_SETATTR+0002B4 (??, ??, ??, ??) 07BC2F0C auto_setattr+0001CC (??, ??, ??, ??) 07BAA04C aix2onc_setattr+00026C (??, ??, ??, ??, ??, ??) 005C36A8 vnop_setattr+000308 (??, ??, ??, ??, ??, ??) ..
Problem conclusion
In auto_setattr(), check if namefs mount tries to sit on top of autofs and return ELOOP
Temporary fix
Comments
6100-08 - use AIX APAR IV64477 6100-09 - use AIX APAR IV63688 7100-02 - use AIX APAR IV62312 7100-03 - use AIX APAR IV63673
APAR Information
APAR number
IV63688
Reported component name
AIX 610 STD EDI
Reported component ID
5765G6200
Reported release
610
Status
CLOSED PER
PE
NoPE
HIPER
NoHIPER
Submitted date
2014-08-18
Closed date
2014-08-18
Last modified date
2015-01-21
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
AIX 610 STD EDI
Fixed component ID
5765G6200
Applicable component levels
R610 PSY U861344
UP14/10/28 I 1000
PTF to Fileset Mapping
U861344 bos.net.nfs.client 6.1.9.30
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Document Information
Modified date:
21 January 2015