linux-ext4 - Re: kernel BUG at fs/ext/super.c:428

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Date:	Wed, 21 Jan 2009 12:10:18 -0800
From:	"Pallipadi, Venkatesh" <venkatesh.pallipadi@...el.com>
To:	Theodore Tso <tytso@....EDU>
Cc:	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Arjan van de Ven <arjan@...ux.intel.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-ext4@...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, 2009-01-14 at 13:20 -0800, Theodore Tso wrote:
> 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?
> 

Unfortunately, I cannot revert this patch alone from upstream git.
But I consistently see
upstream git: Always produces this oops on reboot
checkout of 38d47c1b: Always produces this oops on reboot
checkout of 94aca1da (one patch before the above commit): Reboots fine
without the oops.

This is petty specific to the particular userspace, looks like.
I only see this on SLES10 installation. Also, I need a non-root user
logged in at least once after boot through X to see this problem. I was
always seeing this as I had autologin on local terminal and was remotely
rebooting the system. If I just boot to init 3 or boot to init 5 with no
user logged in or boot to init 5 with root logged in, I do not see this
problem.

Thanks,
Venki

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