linux-kernel - Re: 4.3 kernel panics when MMC/SDHC card is inserted on thinkpad

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Date:   Mon, 5 Dec 2016 11:20:48 +0100
From:   Joerg Roedel <jroedel@...e.de>
To:     David F <dfitz7@...2.net>
Cc:     Adrian Hunter <adrian.hunter@...el.com>,
        linux-kernel@...r.kernel.org, Denis Bychkov <manover@...il.com>
Subject: Re: 4.3 kernel panics when MMC/SDHC card is inserted on thinkpad

Hi David,

On Sun, Dec 04, 2016 at 06:57:57PM -0600, David F wrote:
> Aug 19 13:32:20 taz [  156.425627] ------------[ cut here ]------------
> Aug 19 13:32:20 taz [  156.428136] kernel BUG at
> drivers/iommu/intel-iommu.c:3682!

This BUG_ON triggered because the IOMMU driver can't find a domain for
the device passed to intel_unmap. This looks like an IOMMU bug, but I am
not 100% sure yet, because if there is no domain for a device the
intel_map_page path returns 0 and the intel_unmap function should not be
called.

I need a couple of things to track this down. Can you please build a
kernel with CONFIG_DMA_API_DEBUG=y and boot the kernel with IOMMU
disabled? Insert and remove an SD-Card with this kernel and send me a
full dmesg.

Please also send me the output of 'lspci -v' and a full dmesg with IOMMU
enabled and the BUG triggered.

Thanks,

	Joerg