[Bug 105155] [bdw] GPU HANG: ecode 8:0:0x86dffffd, in Xorg

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=105155

--- Comment #23 from Elizabeth <elizabethx.de.la.torre.mena at intel.com> ---
Well I found interesting that this messages are just before the hang report,
from dmesg:

[  154.524158] DMAR: DRHD: handling fault status reg 3
[  154.524160] DMAR: [DMA Read] Request device [00:02.0] fault addr 38d000
[fault reason 05] PTE Write access is not set

And looking around I believe I found why you have to use the
intel_iommu=igfx_off:

"On HPE ProLiant Gen9-series servers running Red Hat Enterprise Linux 6, Red
Hat Enterprise Linux 7, SUSE Linux Enterprise Server 11 SP3, or SUSE Linux
Enterprise Server 12 with the I/O Memory Management Unit (IOMMU) option Enabled
in the ROM-Based Setup Utility (RBSU) and with "intel_iommu=on" added to the
Linux kernel boot parameters, the IP addresses assigned to interface will not
be accessible and a message similar to "CPU stuck" may be displayed on the
console. In addition, DMAR fault messages are logged in the /var/log/messages
as follows:

> dmar: DRHD: handling fault status reg 2 
> dmar: DMAR:[DMA Write] Request device [02:00.1] fault addr 791dc000 
> DMAR:[fault reason 05] PTE Write access is not set 
> dmar: DMAR:[DMA Write] Request device [02:00.1] fault addr 791dc000 
> DMAR:[fault reason 05] PTE Write access is not set 
> dmar: DMAR:[DMA Write] Request device [02:00.1] fault addr 791dc000 
> DMAR:[fault reason 05] PTE Write access is not set

This occurs because of a known limitation that the bnx2x driver has with the
Option Card Black Box - Active Health (OCBB) feature when IOMMU is enabled. The
network adapter firmware will attempt to access a memory area that is no longer
assigned the network devices when bringing up/down the interface or
loading/unloading the driver. When this occurs, a reboot is required."

Information from here
https://support.hpe.com/hpsc/doc/public/display?docId=emr_na-c04565693

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