linux-kernel - Re: [Bug 7505] Linux-2.6.19 fails to boot on AMD64 machine

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Date:	Thu, 30 Nov 2006 14:46:48 -0700
From:	ebiederm@...ssion.com (Eric W. Biederman)
To:	agalanin@...a.ru (Alexander Galanin), take@...ero.it
Cc:	<linux-kernel@...r.kernel.org>, Andi Kleen <ak@...e.de>,
	benh@...nel.crashing.org, Greg Kroah-Hartman <gregkh@...e.de>,
	Zhang Yanmin <yanmin.zhang@...el.com>
Subject: Re: [Bug 7505] Linux-2.6.19 fails to boot on AMD64 machine

bugme-daemon@...zilla.kernel.org writes:

> http://bugzilla.kernel.org/show_bug.cgi?id=7505

> one. I think this was a better bisection and I got this

> Bisecting: 1 revisions left to test after this
> [d71374dafbba7ec3f67371d3b7e9f6310a588808] PCI: fix race with pci_walk_bus and
> pci_destroy_dev
> d71374dafbba7ec3f67371d3b7e9f6310a588808 is first bad commit
> commit d71374dafbba7ec3f67371d3b7e9f6310a588808
> Author: Zhang Yanmin <yanmin.zhang@...el.com>
> Date:   Fri Jun 2 12:35:43 2006 +0800
> 
>     [PATCH] PCI: fix race with pci_walk_bus and pci_destroy_dev
> 
>     pci_walk_bus has a race with pci_destroy_dev. When cb is called
>     in pci_walk_bus, pci_destroy_dev might unlink the dev pointed by next.
>     Later on in the next loop, pointer next becomes NULL and cause
>     kernel panic.
> 
>     Below patch against 2.6.17-rc4 fixes it by changing pci_bus_lock (spin_lock)
>     to pci_bus_sem (rw_semaphore).
> 
>     Signed-off-by: Zhang Yanmin <yanmin.zhang@...el.com>
>     Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>
> 
> :040000 040000 570ec0423dac5f57a4b7db859e4f502fab422b4d
> 3fbe35bcc512418894e9ae3862f44363b8b0ab4e M      drivers
> 

Let's try and discussing this someplace where people are watching.  Bugzilla
seems to be a horrible medium for tracking down bugs.

Does reverting the above commit allow later kernels to boot?  Or do you
still get the impossible oops?

Eric
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