A fix is available
APAR status
Closed as program error.
Error description
activities on NFS v4 client hangs after force unmount. There will be a three way dead lock. Thread A : it did the force unmount, which holds the nfs_rtable_lock but is waiting for a rnode to come out of state change. Thread B : it is the one trigger the state change. However, it is waiting to lock the client open owner within nfs4_open_nocreate() Thread C : this one got lock on the client open owner but it is waiting for the nfs_rtable_lock to create an rnode within nfs4_open_create()->handle_open_reply()
Local fix
Problem summary
activities on NFS v4 client hangs after force unmount. There will be a three way dead lock. Thread A : it did the force unmount, which holds the nfs_rtable_lock but is waiting for a rnode to come out of state change. Thread B : it is the one trigger the state change. However, it is waiting to lock the client open owner within nfs4_open_nocreate() Thread C : this one got lock on the client open owner but it is waiting for the nfs_rtable_lock to create an rnode within nfs4_open_create()->handle_open_reply()
Problem conclusion
in nfs4 client, whenever calling nfs4_block_state_change() we need to make sure that we are not holding the nfs_rtable_lock.
Temporary fix
Comments
6100-04 - use AIX APAR IZ79868 6100-05 - use AIX APAR IZ79841 6100-06 - use AIX APAR IZ79210 6100-06 - use AIX APAR IZ79688 7100-00 - use AIX APAR IZ79909
APAR Information
APAR number
IZ79688
Reported component name
AIX 610 STD EDI
Reported component ID
5765G6200
Reported release
610
Status
CLOSED PER
PE
NoPE
HIPER
NoHIPER
Submitted date
2010-07-08
Closed date
2010-07-08
Last modified date
2013-03-28
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 U835918
UP11/05/10 I 1000
PTF to Fileset Mapping
U835918 bos.net.nfs.client 6.1.6.15
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Document Information
Modified date:
28 March 2013