From: Garrick Staples <garrick@usc.edu>
Subject: possible client stale filehandle bug?
Date: Tue, 25 Jan 2005 09:39:45 -0800
Message-ID: <20050125173945.GU12269@polop.usc.edu>
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Hi all,
   I have lots of storage in a large Solaris samfs environment that is NFS
shared to a large number of Solaris and RHEL3 clients.  Under some conditio=
ns,
linux apps have been getting stale filehandles during the normal course of
their activity.  Various file handling syscalls like read() or open() might
error.  Lots of renames and setattrs calls seem to trigger the problem. =20
'ci' and 'cvs commit' are particularly good at this.

It seems that the Solaris clients never report any such errors, only the Li=
nux
clients.  However, watching 'snoop' on the Solaris NFS server, I see that i=
t IS
returning stale file handles to both OSes, but Solaris clients seem to retry
the request several times; and the Linux clients immediately pass the error=
 up
to the application.

Is there some condition that the 2.4 kernel is handling incorrectly?


Sample snippet from the 'snoop' on the Solaris server with a Solaris client
waiting...

rcf102.usc.edu -> almaak.usc.edu NFS C LOOKUP3 FH=3DB41B Entries.Log
almaak.usc.edu -> rcf102.usc.edu NFS R LOOKUP3 OK FH=3D7BFE
rcf102.usc.edu -> almaak.usc.edu TCP D=3D2049 S=3D610     Ack=3D3071279992 =
Seq=3D337022612 Len=3D0 Win=3D64240
rcf102.usc.edu -> almaak.usc.edu NFS C ACCESS3 FH=3D7BFE (read,modify,exten=
d,execute)
almaak.usc.edu -> rcf102.usc.edu TCP D=3D610 S=3D2049     Ack=3D337022752 S=
eq=3D3071279992 Len=3D0 Win=3D64240
almaak.usc.edu -> rcf102.usc.edu NFS R ACCESS3 Stale NFS file handle
rcf102.usc.edu -> almaak.usc.edu NFS C LOOKUP3 FH=3DB41B Entries.Log
almaak.usc.edu -> rcf102.usc.edu NFS R LOOKUP3 OK FH=3D7BFE
rcf102.usc.edu -> almaak.usc.edu NFS C LOOKUP3 FH=3DB41B Entries.Log
almaak.usc.edu -> rcf102.usc.edu NFS R LOOKUP3 OK FH=3D7BFE
rcf102.usc.edu -> almaak.usc.edu TCP D=3D2049 S=3D610     Ack=3D3071280516 =
Seq=3D337023056 Len=3D0 Win=3D64240
rcf102.usc.edu -> almaak.usc.edu NFS C ACCESS3 FH=3D7BFE (read,modify,exten=
d,execute)
almaak.usc.edu -> rcf102.usc.edu TCP D=3D610 S=3D2049     Ack=3D337023196 S=
eq=3D3071280516 Len=3D0 Win=3D64240
almaak.usc.edu -> rcf102.usc.edu NFS R ACCESS3 Stale NFS file handle
rcf102.usc.edu -> almaak.usc.edu NFS C LOOKUP3 FH=3DB41B Entries.Log
almaak.usc.edu -> rcf102.usc.edu NFS R LOOKUP3 OK FH=3D7BFE
rcf102.usc.edu -> almaak.usc.edu TCP D=3D2049 S=3D610     Ack=3D3071280796 =
Seq=3D337023348 Len=3D0 Win=3D64240
rcf102.usc.edu -> almaak.usc.edu NFS C LOOKUP3 FH=3DB41B Entries.Log
almaak.usc.edu -> rcf102.usc.edu NFS R LOOKUP3 OK FH=3D7BFE
rcf102.usc.edu -> almaak.usc.edu TCP D=3D2049 S=3D610     Ack=3D3071281040 =
Seq=3D337023500 Len=3D0 Win=3D64240
rcf102.usc.edu -> almaak.usc.edu NFS C ACCESS3 FH=3D7BFE (read,modify,exten=
d,execute)
almaak.usc.edu -> rcf102.usc.edu TCP D=3D610 S=3D2049     Ack=3D337023640 S=
eq=3D3071281040 Len=3D0 Win=3D64240
almaak.usc.edu -> rcf102.usc.edu NFS R ACCESS3 Stale NFS file handle
rcf102.usc.edu -> almaak.usc.edu NFS C LOOKUP3 FH=3DB41B Entries.Log
almaak.usc.edu -> rcf102.usc.edu NFS R LOOKUP3 OK FH=3D7BFE
rcf102.usc.edu -> almaak.usc.edu NFS C LOOKUP3 FH=3DB41B Entries.Log
almaak.usc.edu -> rcf102.usc.edu NFS R LOOKUP3 OK FH=3D7BFE

--=20
Garrick Staples, Linux/HPCC Administrator
University of Southern California

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