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

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Message-ID: <20161117220045.GD2078@8bytes.org>
Date:   Thu, 17 Nov 2016 23:00:45 +0100
From:   Joerg Roedel <joro@...tes.org>
To:     Mark Hounschell <markh@...pro.net>
Cc:     iommu@...ts.linux-foundation.org,
        Linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: BUG at drivers/iommu/amd_iommu.c:1436!

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.



	Joerg