linux-kernel - Re: fs: gpf in simple

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Date:	Mon, 24 Mar 2014 20:44:14 -0400
From:	Sasha Levin <sasha.levin@...cle.com>
To:	Jan Kara <jack@...e.cz>
CC:	Al Viro <viro@...IV.linux.org.uk>, linux-fsdevel@...r.kernel.org,
	LKML <linux-kernel@...r.kernel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: fs: gpf in simple_setattr

On 03/24/2014 05:48 PM, Jan Kara wrote:
>> >[  339.948946] ** 4194304 ffff8805ac03ba38 [eventpoll] ffff8806ec051fe0
>> >[eventpoll] ffffffff84666040 ffff88056c73e7b0           (null)
>    OK, great. So finally we have something useful. We know we have problems
> with [eventpoll] dentry. That is actually a special filesystem not mounted
> anywhere - likely you get to that dentry through/proc/<pid>/fd/. Now
> eventpoll is interesting because it uses single anon inode for all
> eventpoll instances. And that inode should stay in place as long as
> eventpoll filesystem exists. So it's not clear how come that inode is
> freed. The basic check of handling of inode use count didn't find anything
> suspicious. But I can check in more detail and if I fail, we now have a
> pretty narrow area where to look...

Seems like it's not specific to eventpoll, I saw the same error message with
"eventfd" and "perf_event".


Thanks,
Sasha
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