linux-ext4 - [Bug 107301] system hang during ext4 xattr operation

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Message-ID: <bug-107301-13602-CY4XwSLMNn@https.bugzilla.kernel.org/>
Date:	Thu, 05 Nov 2015 17:02:57 +0000
From:	bugzilla-daemon@...zilla.kernel.org
To:	linux-ext4@...r.kernel.org
Subject: [Bug 107301] system hang during ext4 xattr operation

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

Jan Kara <jack@...e.cz> changed:

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

--- Comment #1 from Jan Kara <jack@...e.cz> ---
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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