Re: io_page_fault seen in normal kernel boot log

[Joerg Roedel]

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