linux-kernel - Re: kernel BUG at fs/ext/super.c:428

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Message-ID: <20090114212038.GJ6222@mit.edu>
Date:	Wed, 14 Jan 2009 16:20:38 -0500
From:	Theodore Tso <tytso@....EDU>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc:	"Pallipadi, Venkatesh" <venkatesh.pallipadi@...el.com>,
	Arjan van de Ven <arjan@...ux.intel.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, linux-ext4@...r.kernel.org,
	Ingo Molnar <mingo@...e.hu>,
	Nick Piggin <nickpiggin@...oo.com.au>
Subject: Re: kernel BUG at fs/ext/super.c:428

On Wed, Jan 14, 2009 at 08:29:37PM +0100, Peter Zijlstra wrote:
> > 38d47c1b7075bd7ec3881141bb3629da58f88dab is first bad commit
> > commit 38d47c1b7075bd7ec3881141bb3629da58f88dab
> > Author: Peter Zijlstra <a.p.zijlstra@...llo.nl>
> > Date:   Fri Sep 26 19:32:20 2008 +0200
> > 
> >     futex: rely on get_user_pages() for shared futexes
> >     
> >     On the way of getting rid of the mmap_sem requirement for shared futexes,
> >     start by relying on get_user_pages().
> >     
> >     Signed-off-by: Peter Zijlstra <a.p.zijlstra@...llo.nl>
> >     Acked-by: Nick Piggin <nickpiggin@...oo.com.au>
> >     Signed-off-by: Ingo Molnar <mingo@...e.hu>
> > 
> However does a futex change make ext3 crap its pants?

I agree, this doesn't make much sense.  I've looked at the patch, and
I don't see how this would cause an ext3 orphaned-inode list handling
problem

Are you sure the bisect was done correctly?  Have you tried reverting
that one commit, or otherwise conclusively shown that a kernel with
this commit fails, and one without this commit works just fine?

     	    	       	   	   	- Ted
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