From mboxrd@z Thu Jan  1 00:00:00 1970
From: Justin Piszcz <jpiszcz@lucidpixels.com>
Subject: Re: 3.1-rc4: spectacular kernel errors / filesystem crash
Date: Tue, 13 Sep 2011 10:54:13 -0400 (EDT)
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Cc: Jesse Brandeburg <jesse.brandeburg@gmail.com>,
	Alan Piszcz <ap@solarrain.com>,
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To: Eric Dumazet <eric.dumazet@gmail.com>
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On Tue, 13 Sep 2011, Eric Dumazet wrote:

> Please Justin make sure you pulled commit 
>
> commit ed2888e906b56769b4ffabb9c577190438aa68b8
> Author: Jon Mason <mason@myri.com>
> Date:   Thu Sep 8 16:41:18 2011 -0500
>
>    PCI: Remove MRRS modification from MPS setting code
>
>    Modifying the Maximum Read Request Size to 0 (value of 128Bytes) has
>    massive negative ramifications on some devices.  Without knowing which
>    devices have this issue, do not modify from the default value when
>    walking the PCI-E bus in pcie_bus_safe mode.  Also, make pcie_bus_safe
>    the default procedure.
>
>    Tested-by: Sven Schnelle <svens@stackframe.org>
>    Tested-by: Simon Kirby <sim@hostway.ca>
>    Tested-by: Stephen M. Cameron <scameron@beardog.cce.hp.com>
>    Reported-and-tested-by: Eric Dumazet <eric.dumazet@gmail.com>
>    Reported-and-tested-by: Niels Ole Salscheider <niels_ole@salscheider-online.
>    References: https://bugzilla.kernel.org/show_bug.cgi?id=42162
>    Signed-off-by: Jon Mason <mason@myri.com>
>    Acked-by: Jesse Barnes <jbarnes@virtuousgeek.org>
>    Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

Hello,

I found this commit here:
http://permalink.gmane.org/gmane.linux.kernel.pci/11700

Applied:
# patch -p1 < ../ed2888e906b56769b4ffabb9c577190438aa68b8.txt 
patching file drivers/pci/probe.c

I will update this thread if the problem recurs, can someone also please advise
which DEBUG options I should have enabled to catch further SLAB/RCU issues?

So far, I have the following enabled:

CONFIG_ARCH_SUPPORTS_DEBUG_PAGEALLOC=y
CONFIG_HAVE_DMA_API_DEBUG=y
CONFIG_X86_DEBUGCTLMSR=y
CONFIG_DEBUG_FS=y
CONFIG_DEBUG_KERNEL=y
CONFIG_DEBUG_SLAB=y
CONFIG_DEBUG_SLAB_LEAK=y
CONFIG_DEBUG_KMEMLEAK=y
CONFIG_DEBUG_STACK_USAGE=y
CONFIG_DEBUG_BUGVERBOSE=y
CONFIG_DEBUG_INFO=y
CONFIG_DEBUG_VM=y
CONFIG_DEBUG_VIRTUAL=y
CONFIG_DEBUG_MEMORY_INIT=y
CONFIG_DEBUG_PER_CPU_MAPS=y
CONFIG_DEBUG_PAGEALLOC=y
CONFIG_DEBUG_STACKOVERFLOW=y
CONFIG_DEBUG_RODATA=y

Thanks,

Justin.