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Date: Mon, 5 Sep 2016 11:59:01 +0200
From: Joerg Roedel <joro@8bytes.org>
To: Baoquan He <bhe@redhat.com>
Cc: iommu@lists.linux-founda, linux-kernel@vger.kernel.org,
        dyoung@redhat.com
Subject: Re: io_page_fault seen in normal kernel boot log
Message-ID: <20160905095900.GQ1437@8bytes.org>
References: <20160905053805.GC29344@x1.redhat.com>
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Hi Baoquan

On Mon, Sep 05, 2016 at 01:38:05PM +0800, Baoquan He wrote:
> This happened on 4.8.0-rc5
> 
> [  +0.006771] AMD-Vi: Event logged [IO_PAGE_FAULT device=00:14.4 domain=0x0009 address=0x0000000000001000 flags=0x0000]
> [  +0.010593] AMD-Vi: Event logged [IO_PAGE_FAULT device=00:14.4 domain=0x0009 address=0x0000000000001040 flags=0x0000]
> [  +0.010596] AMD-Vi: Event logged [IO_PAGE_FAULT device=00:14.4 domain=0x0009 address=0x0000000000001080 flags=0x0000]
> [  +0.010597] AMD-Vi: Event logged [IO_PAGE_FAULT device=00:14.4 domain=0x0009 address=0x00000000000010c0 flags=0x0000]
> [  +0.010592] AMD-Vi: Event logged [IO_PAGE_FAULT device=00:14.4 domain=0x0009 address=0x0000000000001100 flags=0x0000]
> [  +0.010592] AMD-Vi: Event logged [IO_PAGE_FAULT device=00:14.4 domain=0x0009 address=0x0000000000001140 flags=0x0000]

This is probably a radeon driver issue, the address looks like its
handed out by the IOMMU driver, so probably a use-after-free bug. I also
see those GPU related faults from time to time. The system usually boots
fine anyway. Does boot complete on that system?


Regards,

	Joerg