[Bug 107301] system hang during ext4 xattr operation

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https://bugzilla.kernel.org/show_bug.cgi?id=107301

Jan Kara <jack@xxxxxxx> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |NEEDINFO

--- Comment #1 from Jan Kara <jack@xxxxxxx> ---
Hum, from the stack traces in the log it seems mb_cache_entry_alloc() is racing
with other operations on the LRU and restarting all the time. Another
possibility is that there are lots of entries in the LRU and it takes a long
time to scan (if I remember right ceph is a heavy user of xattrs).

The first problem would be easily fixed by adding cond_resched() at appropriate
place, the second problem would require more intrusive changes in how LRU is
handled.

Can you reproduce the issue?

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