netdev - Re: 3.1-rc4: spectacular kernel errors / filesystem crash

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Date:	Tue, 13 Sep 2011 10:35:29 -0500
From:	Jon Mason <mason@...i.com>
To:	Justin Piszcz <jpiszcz@...idpixels.com>
Cc:	Eric Dumazet <eric.dumazet@...il.com>,
	Jesse Brandeburg <jesse.brandeburg@...il.com>,
	Alan Piszcz <ap@...arrain.com>,
	NetDEV list <netdev@...r.kernel.org>, xfs@....sgi.com,
	linux-kernel@...r.kernel.org
Subject: Re: 3.1-rc4: spectacular kernel errors / filesystem crash

On Tue, Sep 13, 2011 at 9:54 AM, Justin Piszcz <jpiszcz@...idpixels.com> wrote:
>
>
> On Tue, 13 Sep 2011, Eric Dumazet wrote:
>
>> Please Justin make sure you pulled commit
>> commit ed2888e906b56769b4ffabb9c577190438aa68b8
>> Author: Jon Mason <mason@...i.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@...ckframe.org>
>>   Tested-by: Simon Kirby <sim@...tway.ca>
>>   Tested-by: Stephen M. Cameron <scameron@...rdog.cce.hp.com>
>>   Reported-and-tested-by: Eric Dumazet <eric.dumazet@...il.com>
>>   Reported-and-tested-by: Niels Ole Salscheider
>> <niels_ole@...scheider-online.
>>   References: https://bugzilla.kernel.org/show_bug.cgi?id=42162
>>   Signed-off-by: Jon Mason <mason@...i.com>
>>   Acked-by: Jesse Barnes <jbarnes@...tuousgeek.org>
>>   Signed-off-by: Linus Torvalds <torvalds@...ux-foundation.org>
>
> Hello,
>
> I found this commit here:
> http://permalink.gmane.org/gmane.linux.kernel.pci/11700

This is an early version of the patch.  This is the patch that you want:
https://github.com/torvalds/linux/commit/ed2888e906b56769b4ffabb9c577190438aa68b8

It appears that this patch didn't make it to lkml or linux-pci list
due to kernel.org DNS being down when it was sent.

Thanks,
Jon

>
> 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.
>
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