linux-kernel - Re: 2.6.22-rc6-mm1 Intel DMAR crash on AMD x86

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Date:	Thu, 28 Jun 2007 18:58:43 -0600
From:	Robert Hancock <hancockr@...w.ca>
To:	Zan Lynx <zlynx@....org>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, ashok.raj@...el.com,
	shaohua.li@...el.com, anil.s.keshavamurthy@...el.com
Subject: Re: 2.6.22-rc6-mm1 Intel DMAR crash on AMD x86_64

Zan Lynx wrote:
> On Thu, 2007-06-28 at 03:43 -0700, Andrew Morton wrote:
>> ftp://ftp.kernel.org/pub/linux/kernel/people/akpm/patches/2.6/2.6.22-rc6/2.6.22-rc6-mm1/
> 
>> +intel-iommu-dmar-detection-and-parsing-logic.patch
>> +intel-iommu-pci-generic-helper-function.patch
>> +intel-iommu-pci-generic-helper-function-fix.patch
>> +intel-iommu-clflush_cache_range-now-takes-size-param.patch
>> +intel-iommu-iova-allocation-and-management-routines.patch
>> +intel-iommu-iova-allocation-and-management-routines-fix.patch
>> +intel-iommu-iova-allocation-and-management-routines-fix-2.patch
>> +intel-iommu-intel-iommu-driver.patch
>> +intel-iommu-intel-iommu-driver-fix.patch
>> +intel-iommu-intel-iommu-driver-fix-2.patch
>> +intel-iommu-avoid-memory-allocation-failures-in-dma-map-api-calls.patch
>> +intel-iommu-intel-iommu-cmdline-option-forcedac.patch
>> +intel-iommu-dmar-fault-handling-support.patch
>> +intel-iommu-iommu-gfx-workaround.patch
>> +intel-iommu-iommu-floppy-workaround.patch
>> +intel-iommu-iommu-floppy-workaround-fix.patch
>> +intel-iommu-iommu-floppy-workaround-fix-fix.patch
>>
>>  Intel IOMMU support
> 
> I believe the above patch set is causing the problem.  On my first try
> with rc6-mm1 I said Yes to the CONFIG_DMAR options. (I'm nearly as good
> as random option selection :-)
> 
> The system panicked during boot, I believe it was trying to detect an
> Intel IOMMU.  Later when I have a camera, I will try to post a
> screenshot of the backtrace. (I can't seem to get netconsole to work on
> boot, only in a module).
> 
> When I recompiled without DMAR set, things seem to be working great.  I
> seem to be getting better disk read throughput than rc3-mm1, by the way.
> 
> This laptop is an AMD Athlon64 on a NForce3 running a 64-bit Gentoo
> build.
> 
> I'll provide more details on request, and when I get the chance.  This
> is a heads-up on the BUG in case someone has an "ah ha!" moment.

I took a picture of it, looks like the backtrace is:

NULL pointer dereference at 024
EIP:dmar_table_init+0x11
intel_iommu_init+0x30
pci_iommu_init+0xe
kernel_init+0x16e

Presumably something is NULL in dmar_table_init that wasn't expected to 
be.. I would guess it likely crashes on any system without an Intel 
IOMMU in it.

-- 
Robert Hancock      Saskatoon, SK, Canada
To email, remove "nospam" from hancockr@...pamshaw.ca
Home Page: http://www.roberthancock.com/

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