linux-kernel - Re: BUG at drivers/iommu/amd

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Message-ID: <b8260bfd-55c9-c029-1af1-e1ccc719dd3a@compro.net>
Date:   Fri, 18 Nov 2016 09:04:05 -0500
From:   Mark Hounschell <markh@...pro.net>
To:     Joerg Roedel <joro@...tes.org>
Cc:     iommu@...ts.linux-foundation.org,
        Linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: BUG at drivers/iommu/amd_iommu.c:1436!

On 11/17/2016 05:00 PM, Joerg Roedel wrote:
> On Thu, Nov 17, 2016 at 04:53:24PM -0500, Mark Hounschell wrote:
>> On 11/17/2016 04:41 PM, Joerg Roedel wrote:
>>> Hi Mark,
>>>
>>> On Thu, Nov 17, 2016 at 02:13:59PM -0500, Mark Hounschell wrote:
>>>> Kernel version is 4.8.0. No failure when the IOMMU is disabled. This
>>>> is an out of tree GPL driver using
>>>> pci_alloc_consistent/pci_free_consistent. The free causes this.
>>>
>>> Can you please run the driver with dma-api debugging enabled? Does it
>>> trigger any warnings?
>>>
>>
>> It's been a while since I've done that for ya. Kernel config
>> options? Kernel cmd line you want?
>
> Just enable CONFIG_DMA_API_DEBUG and boot the resulting kernel. Please
> send me full dmesg when the issue happens again.
>

OK. It's attached.

Mark


View attachment "dmesg.txt" of type "text/plain" (93364 bytes)