linux-kernel - Re: 3.5-rc6 configfs BUG

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Message-ID: <20120815083013.GM31083@dhcp-172-17-9-228.mtv.corp.google.com>
Date:	Wed, 15 Aug 2012 01:30:13 -0700
From:	Joel Becker <jlbec@...lplan.org>
To:	Dave Jones <davej@...hat.com>,
	Linux Kernel <linux-kernel@...r.kernel.org>
Subject: Re: 3.5-rc6 configfs BUG_ON

On Sun, Jul 15, 2012 at 07:58:31PM -0400, Dave Jones wrote:
> On Sun, Jul 15, 2012 at 01:58:46PM -0700, Joel Becker wrote:
>  
>  > > Call Trace:
>  > >  [<ffffffff811ec74f>] d_kill+0xaf/0x120
>  > >  [<ffffffff811ec8a2>] dput+0xe2/0x1d0
>  > >  [<ffffffff811dfaea>] path_put+0x1a/0x30
>  > >  [<ffffffff811d9705>] vfs_fstatat+0x55/0x70
>  > >  [<ffffffff811d973e>] vfs_lstat+0x1e/0x20
>  > >  [<ffffffff811d99ca>] sys_newlstat+0x1a/0x40
>  > >  [<ffffffff81696aed>] system_call_fastpath+0x1a/0x1f
>  > > Code: f6 43 40 01 75 eb 48 8b 7b 50 e8 41 4d f6 ff 48 8b 3d c2 bf 7f 01 48 89 de e8 a2 52 f6 ff 4c 89 e7 e8 1a b5 f9 ff 5b 41 5c 5d c3 <0f> 0b be 9c 00 00 00 48 c7 c7 30 a2 9e 81 e8 42 2e e1 ff eb a7 
>  > > RIP  [<ffffffff812562fb>] configfs_d_iput+0x8b/0xa0
>  > >  RSP <ffff88014325be08>
>  > > ---[ end trace 65e130035db36f7d ]---
>  > > 
>  > >   58         if (sd) {
>  > >   59                 BUG_ON(sd->s_dentry != dentry);
>  > > 
>  > 
>  > Dave,
>  > 	What were you doing at the time?  Is this ocfs2, dlm, target, or
>  > what?
>  > 
>  > Joel
>  > 
> 
> See  http://codemonkey.org.uk/projects/trinity/
> Running that with -c newlstat should trigger it.
> (load configfs module first, no further config necessary)

Cool tool.  I presume that -c newlstat just randomly picks paths to
newlstat.  I think I see what's happening, but I can't see what gets the
dirent into that state.  Now to get a VM I can break.

Joel

-- 

"The trouble with being punctual is that nobody's there to
 appreciate it."
	- Franklin P. Jones

			http://www.jlbec.org/
			jlbec@...lplan.org
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