A fix is available
APAR status
Closed as program error.
Error description
System asserts in nfs_async_readdir() with following stack: [04C0D654]nfs_async_readdir+000054 (F100068004DF2000, F10006800131CE80, F10006001A51C87C, 0000000004D6FFA8 [??]) [04C14DC0]nfs3_readdir+000660 (??, ??, ??, ??) [04B50F08]aix2onc_readdir_eofp+0000A8 (??, ??, ??, ??) [004B7EEC]vnop_readdir+00008C (??, ??, ??) [005B4770]getdirent64+000170 (??, ??, ??) [00003844].svc_instr+000144 () Problem typically seen on systems running with high number of biod threads
Local fix
Lower the number of biod threads to 4. Filesystem needs to be mounted with the new biods option. mount -o biods=4 <server_name>:<FS_NAME> <mount_point>
Problem summary
system asserts in nfs_async_readdir() with following stack: 04C0D654 nfs_async_readdir+000054 (F100068004DF2000, F10006800131CE80, F10006001A51C87C, 0000000004D6FFA8 ?? ) 04C14DC0 nfs3_readdir+000660 (??, ??, ??, ??) 04B50F08 aix2onc_readdir_eofp+0000A8 (??, ??, ??, ??) 004B7EEC vnop_readdir+00008C (??, ??, ??) 005B4770 getdirent64+000170 (??, ??, ??) 00003844 .svc_instr+000144 () Problem typically seen on systems running with high number of biod threads becase of a race condition in nfs code.
Problem conclusion
NFS client code is modified to take a hold on the vnode, before doing the async operation to avoid the race condition.
Temporary fix
Comments
5300-08 - use AIX APAR IZ73849 5300-09 - use AIX APAR IZ73788 5300-10 - use AIX APAR IZ73721 5300-11 - use AIX APAR IZ68536 5300-12 - use AIX APAR IZ72490 6100-01 - use AIX APAR IZ75431 6100-02 - use AIX APAR IZ75479 6100-03 - use AIX APAR IZ54301 6100-05 - use AIX APAR IZ70930 6100-04 - use AIX APAR IZ68544 6100-05 - use AIX APAR IZ70930 6100-06 - use AIX APAR IZ68433 7100-00 - use AIX APAR IZ81777
APAR Information
APAR number
IZ73849
Reported component name
AIX 5.3
Reported component ID
5765G0300
Reported release
530
Status
CLOSED PER
PE
NoPE
HIPER
NoHIPER
Submitted date
2010-03-31
Closed date
2010-03-31
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:
Fix information
Fixed component name
AIX 5.3
Fixed component ID
5765G0300
Applicable component levels
R530 PSY U832253
UP10/05/17 I 1000
PTF to Fileset Mapping
U832253 bos.net.nfs.client 5.3.8.10
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Document Information
Modified date:
29 March 2013