[Bug 111451] New: igfx iommu causes hangs: DMAR: DRHD: handling fault status reg 3

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=111451

            Bug ID: 111451
           Summary: igfx iommu causes hangs: DMAR: DRHD: handling fault
                    status reg 3
           Product: DRI
           Version: DRI git
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: pmenzel+bugs.freedesktop.org at molgen.mpg.de
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Created attachment 145112
  --> https://bugs.freedesktop.org/attachment.cgi?id=145112&action=edit
Linux kernel 5.2.9 messages

Debian enabled CONFIG_INTEL_IOMMU_DEFAULT_ON=y in Linux 5.2.9 [1], and now
there are hangs on the Dell Latitude E7250, often after using the laptops
function brightness keys.

```
[   41.975448] DMAR: DRHD: handling fault status reg 3
[   41.975456] DMAR: [DMA Write] Request device [00:02.0] fault addr
fffec1003000 [fault reason 23] Unknown
[   41.987006] DMAR: DRHD: handling fault status reg 3
[   41.987013] DMAR: [DMA Write] Request device [00:02.0] fault addr
fffec1006000 [fault reason 23] Unknown
[   42.157270] DMAR: DRHD: handling fault status reg 3
[   42.157275] DMAR: [DMA Write] Request device [00:02.0] fault addr
fffec1003000 [fault reason 23] Unknown
[   42.886618] DMAR: DRHD: handling fault status reg 3
[   47.549330] dmar_fault: 11 callbacks suppressed
[   47.549333] DMAR: DRHD: handling fault status reg 3
[   47.549343] DMAR: [DMA Write] Request device [00:02.0] fault addr
fffec1006000 [fault reason 23] Unknown
[   48.699784] DMAR: DRHD: handling fault status reg 3
[   48.699799] DMAR: [DMA Write] Request device [00:02.0] fault addr
fffec1003000 [fault reason 23] Unknown
[   48.880717] DMAR: DRHD: handling fault status reg 3
[   48.880733] DMAR: [DMA Write] Request device [00:02.0] fault addr
fffec1006000 [fault reason 23] Unknown
[   50.033196] DMAR: DRHD: handling fault status reg 3
[   57.985477] i915 0000:00:02.0: GPU HANG: ecode 8:1:0xfffffffe, in
gnome-shell [938], hang on rcs0
[   57.985479] [drm] GPU hangs can indicate a bug anywhere in the entire gfx
stack, including userspace.
[   57.985479] [drm] Please file a _new_ bug report on bugs.freedesktop.org
against DRI -> DRM/Intel
[   57.985479] [drm] drm/i915 developers can then reassign to the right
component if it's not a kernel issue.
[   57.985480] [drm] The gpu crash dump is required to analyze gpu hangs, so
please always attach it.
[   57.985480] [drm] GPU crash dump saved to /sys/class/drm/card0/error
[   57.986489] i915 0000:00:02.0: Resetting rcs0 for hang on rcs0
[…]
```

Booting with `intel_iommu=igfx_off` fixes this [2].

This seems to be a common problem [3][4][5][6].

[1]: https://bugs.debian.org/934309
[2]: https://bugs.kali.org/view.php?id=5644
[3]: https://bbs.archlinux.org/viewtopic.php?id=230362
[4]: https://bugzilla.kernel.org/show_bug.cgi?id=202723
[5]: https://bugs.freedesktop.org/show_bug.cgi?id=109219
[6]: https://bugs.freedesktop.org/show_bug.cgi?id=89360
[4]: https://bugs.freedesktop.org/show_bug.cgi?id=103076

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