kern/170680: Multiple NFS Client bug in the FreeBSD 7.4-RELEASE

Mark Saad msaad at
Thu Aug 16 20:20:11 UTC 2012

>Number:         170680
>Category:       kern
>Synopsis:       Multiple NFS Client bug in the FreeBSD 7.4-RELEASE
>Confidential:   no
>Severity:       critical
>Priority:       high
>Responsible:    freebsd-bugs
>State:          open
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Thu Aug 16 20:20:11 UTC 2012
>Originator:     Mark Saad
>Release:        FreeBSD 7.4-RELEASE-p9 amd64
System: FreeBSD highwire 7.4-RELEASE-p9 FreeBSD 7.4-RELEASE-p9 #0: Mon Jun 11 19:47:58 UTC 2012     root at  amd64

         There are multiple NFS client bugs that need to be fixed in the FreeBSD 7.4-RELEASE code base that have been fixed in 8-STABLE, 8.3-RELEASE 9-STABLE and HEAD. Here is a list of the relevant MFCs 194358,230394,230441,230489,230552,232116,232420 and r227059
This code has now been in 7-STABLE for two weeks .
        Running multiple 7.4-RELEASE servers that uses NFS mount directories there exists two nasty issue. If client a reads a file o r directory as client b changes the file or directory , in a short enough amount of time, client a never sees the file or directory changed and it will see old data and attributes for this object until it attempts to write to it . Secondly when multiple NFS client using lockd, are under a moderate work load the client will crash due to a rpc bug brought about by high rates of locking.

   The following MFCs need to be merged into the 7.4-RELEASE branch.  MFCs 194358,230394,230441,230489,230552,232116,232420 and r22

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