linux-kernel - Re: todays git: WARNING: at drivers/ata/libata-sff.c:1017 ata_sff_hsm

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Message-ID: <20090110132412.GB14049@elte.hu>
Date:	Sat, 10 Jan 2009 14:24:12 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Jeff Garzik <jeff@...zik.org>
Cc:	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Sergei Shtylyov <sshtylyov@...mvista.com>,
	Christian Borntraeger <borntraeger@...ibm.com>,
	linux-ide@...r.kernel.org, Jeff Garzik <jgarzik@...hat.com>,
	lkml <linux-kernel@...r.kernel.org>
Subject: Re: todays git: WARNING: at drivers/ata/libata-sff.c:1017
	ata_sff_hsm_move+0x45e/0x750()

* Jeff Garzik <jeff@...zik.org> wrote:

> Ingo Molnar wrote:
>> 871af12: libata: Add 32bit PIO support
>
> What happens when you back this out?

yep, that's the one that looked most suspect to me too so i already 
reverted it in tip/out-of-tree.

But in the normal tip/master test cycle the box takes about 50 minutes to 
build its random kernel and reboot into it (800 MHz P3), so i started a 
full automated bisection instead driven from a faster box.

The bug triggers deterministically so whatever leads to it, we should have 
it within ~20 minutes with a bit of luck (== there's no other bug in the 
bisection run that makes bisection more difficult).

The current bisection state is:

 # bad:  [9a100a44] Merge git://git.kernel.org/pub/scm/linux/kernel/gi
 # good: [9e42d0cf] Merge git://git.kernel.org/pub/scm/linux/kernel/gi
 # good: [e441d54d] Btrfs: add permission checks to the ioctls
 # bad:  [cd764695] Merge git://git.kernel.org/pub/scm/linux/kernel/gi
 # bad:  [a419df8a] Merge branch 'upstream-linus' of git://git.kernel.
 # good: [61bce0f1] pid: generalize task_active_pid_ns

and "871af12: libata: Add 32bit PIO support" is still in the bisection 
window.

	Ingo
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