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I have been mounting NFS shares on my x86 Ubuntu with NIS/am-utils fine for a long time, but today my system got into a state where it could no longer access automounted directories and instead frequently got hung up trying to access them, returning either "Input/output error" or "Permission denied" (almost randomly), as well as "stale file handle." I can, however, manually mount that share fine. Restarting am-utils doesn't help get my system out of its funk; is there any other way of getting my system un-stuck?

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up vote 2 down vote accepted
 umount -f -l 

always works for me on hung nfs mounts.

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This didn't turn out to be the actual problem - the server was borked - but it's a good tip. – Yang Sep 21 '10 at 18:18

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