linux-ext4 - [Bug 62751] INFO: rcu_sched detected stalls on CPUs/tasks: { 3} (detected by 2, t=15107 jiffies, g=270766, c=270765, q=0)

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Message-ID: <bug-62751-13602-2unXrZLIn4@https.bugzilla.kernel.org/>
Date:	Wed, 09 Oct 2013 20:53:49 +0000
From:	bugzilla-daemon@...zilla.kernel.org
To:	linux-ext4@...r.kernel.org
Subject: [Bug 62751] INFO: rcu_sched detected stalls on CPUs/tasks: { 3}
 (detected by 2, t=15107 jiffies, g=270766, c=270765, q=0)

https://bugzilla.kernel.org/show_bug.cgi?id=62751

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |jack@...e.cz

--- Comment #3 from Jan Kara <jack@...e.cz> ---
Thanks. This looks like a problem in the shrinker for ext4 extent cache.
Apparently we burn too much time (the longest stall is over 2 seconds)
searching and freeing extents without giving CPU a break. Ideally we should
make the shrinker more efficient (since I don't believe it was called with so
many entries to free) but if that won't work out easily, we should at least
sprinkle some cond_resched() into the shrinker code as a band aid. I'll see
what we can do.

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