Bug 71658

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Description of problem:
Directories are mounted on a RedHat Linux client system from an SGI Irix NFS
server. The mounts are automatically handled by amd. If the server is rebooted,
the mount points sometimes go into some kind of error state where attempting to
read from anything mounted there gives an Input/output error, attempting to
umount gives a busy error, and attempting to use fuser to determine what
processes  are using the mounted directory gives an Input/output error. It seems
that the only way to clear the error is to reboot the client machine.

Version-Release number of selected component (if applicable):


How reproducible:
Sometimes

Steps to Reproduce:
I believe that in order to reproduce, one or more files on the mounted
NFS filesystem must be open when the NFS server is rebooted. It is not possible
to reproduce this problem reliably for any one mount point, but if our NFS
server is rebooted, it is almost inevitable that at least one of our 4 heavily
used client machines will need to be rebooted.

Actual Results:  Attempting to access any file in the NFS mounted directory
gives Input/output error.

Expected Results:  Access to the NFS mounted directory should work normally once
the NFS server is back up and running.

Additional info:

The machines in question have been updated to all the latest errata,
and while the problem most frequently occurs on the one running 7.2,
it also occurs on machines running 7.3. It is probable that the machine
most commonly affected is not because of the different version, but because it
makes heavier use of NFS mounted filesystems.