linux-kernel - Re: I_CLEAR bug while shrinking dcache

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Date:	Tue, 14 Apr 2015 16:44:02 +0200
From:	Samuel Thibault <samuel.thibault@...-lyon.org>
To:	Al Viro <viro@...IV.linux.org.uk>
Cc:	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: I_CLEAR bug while shrinking dcache

Al Viro, le Tue 14 Apr 2015 13:44:29 +0100, a écrit :
> On Tue, Apr 14, 2015 at 10:12:54AM +0200, Samuel Thibault wrote:
> > So it seems that shrink_dentry_list was trying to kill an inode which
> > already has I_CLEAR.  I'll be trying the attached patch in the next
> > days.
> 
> That patch is just papering over the problem.

I never said it was a proper fix :)

> The first variant can happen, but in that case it should have had
> DCACHE_DENTRY_KILLED set by said __dentry_kill() and skipped.  The other
> two are clear inode refcounting bugs.
> 
> Do you have a reproducer for that?

It just happened in the middle of the night.

Samuel
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