https://bugzilla.kernel.org/show_bug.cgi?id=43292

--- Comment #10 from Jan Kara <jack@suse.cz>  2012-05-31 20:16:27 ---

I have to say I'm puzzled. Everything looks normal, the IO is submitted and
completed, no sign of any hang. Just the last request - read - has been only
submitted to disk and not yet completed but that can be just a coincidence. To
check what has been read, can you attach here output of dumpe2fs /dev/dm-2?

When the lockup happens, those nfsd threads are sitting there doing nothing for
a long time, am I right?

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