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Bug#914495: linux-image-4.18.0-3-amd64: does not boot here

Cross-posted to 2 groups.

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Ben Hutchings <ben@decadent.org.uk> writes:
> On Mon, 2018-12-03 at 23:08 +0100, TS wrote:
>
>> Just out of curiosity since linux-image-amd64 4.18+100 has been uploaded to
>> unstable. This issue here seems not to be wide spread, or reproducible?
>
> Hard to tell.  There are a few people that reported the same *symptom*,
> but that doesn't mean they found the same bug.

True of course.  But in this case there seems to be a very strong
correlation with Gen4 Intel GPUs. I believe every one of the reports
have had at least a lspci dump showing one of those. And a couple of
the reports had stack traces pointing to gen4_render_ring_flush as well.

Given this, there is an extremely suspicious commit added in v4.18.20: 

 06e562e7f515 ("drm/i915/ringbuffer: Delay after EMIT_INVALIDATE for gen4/gen5")

I do have an old laptop with an affected chipset generation, and
verified that it had the same symptoms.  But never got the time to
actually test any further.  Still, I do think that there is good reason
to simply try a revert of that commit.



Bjørn

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Bug#914495: linux-image-4.18.0-3-amd64: does not boot here TS <debts@xk2c.de> - 2018-12-03 23:20 +0100
  Bug#914495: linux-image-4.18.0-3-amd64: does not boot here Ben Hutchings <ben@decadent.org.uk> - 2018-12-04 01:20 +0100
  Bug#914495: linux-image-4.18.0-3-amd64: does not boot here Bjørn Mork <bjorn@mork.no> - 2018-12-04 09:50 +0100
    Bug#914495: linux-image-4.18.0-3-amd64: does not boot here TS <debts@xk2c.de> - 2018-12-05 06:10 +0100
      Bug#914495: linux-image-4.18.0-3-amd64: does not boot here TS <debts@xk2c.de> - 2018-12-05 07:00 +0100
        Bug#914495: linux-image-4.18.0-3-amd64: does not boot here Norbert Brondeau <norbert.brondeau@free.fr> - 2018-12-06 18:20 +0100
          Bug#914495: linux-image-4.18.0-3-amd64: does not boot here Norbert Brondeau <norbert.brondeau@free.fr> - 2018-12-08 16:50 +0100
            Bug#914495: linux-image-4.18.0-3-amd64: does not boot here Phil <elektron@halo.nu> - 2018-12-08 20:30 +0100
  Bug#914495: linux-image-4.18.0-3-amd64: does not boot here Bjørn Mork <bjorn@mork.no> - 2018-12-06 19:40 +0100

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