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authorTrond Myklebust <Trond.Myklebust@netapp.com>2007-06-14 18:00:42 -0400
committerTrond Myklebust <Trond.Myklebust@netapp.com>2007-07-10 23:40:31 -0400
commitc1384c9c4c184543375b52a0997d06cd98145164 (patch)
tree26bb2ee42dc2fddfe1817d3066844669912adef2 /include/asm-m68k/machw.h
parent6e5b70e9d1e712d8dad5514e0ab5240ac4b5fb57 (diff)
SUNRPC: fix hang due to eventd deadlock...
Brian Behlendorf writes: The root cause of the NFS hang we were observing appears to be a rare deadlock between the kernel provided usermodehelper API and the linux NFS client. The deadlock can arise because both of these services use the generic linux work queues. The usermodehelper API run the specified user application in the context of the work queue. And NFS submits both cleanup and reconnect work to the generic work queue for handling. Normally this is fine but a deadlock can result in the following situation. - NFS client is in a disconnected state - [events/0] runs a usermodehelper app with an NFS dependent operation, this triggers an NFS reconnect. - NFS reconnect happens to be submitted to [events/0] work queue. - Deadlock, the [events/0] work queue will never process the reconnect because it is blocked on the previous NFS dependent operation which will not complete.` The solution is simply to run reconnect requests on rpciod. Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
Diffstat (limited to 'include/asm-m68k/machw.h')
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