Bug#962003: Linux kernel 5.6: [drm:i915_gem_gtt_finish_pages [i915]] ERROR Failed to wait for idle; VT'd may hang

From	Stefan Pietsch <stefan+debian@shellforce.org>
Newsgroups	linux.debian.bugs.dist, linux.debian.kernel
Subject	Bug#962003: Linux kernel 5.6: [drm:i915_gem_gtt_finish_pages [i915]] ERROR Failed to wait for idle; VT'd may hang
Date	2023-01-14 23:50 +0100
Message-ID	<FNXvz-rG2-3@gated-at.bofh.it> (permalink)
References	<AcZHj-3Qz-1@gated-at.bofh.it> <FIbUB-edpS-3@gated-at.bofh.it> <FImdj-ejOp-1@gated-at.bofh.it> <AcZHj-3Qz-1@gated-at.bofh.it> <FImdj-ejOp-1@gated-at.bofh.it>
Organization	linux.* mail to news gateway

Cross-posted to 2 groups.

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On 30.12.22 11:42, Diederik de Haas wrote:
> On Friday, 30 December 2022 01:48:53 CET Stefan Pietsch wrote:
>>>> Affected is at least linux-image-5.6.0-1-amd64 (5.6.7-1) and
>>>> linux-image-5.6.0-2-amd64 (5.6.14-1).>
>>> This also affects 5.5.0-rc5-amd64.
>>>
>>> (https://snapshot.debian.org/archive/debian/20200106T211159Z/pool/main/l/l
>>> inux/)
>>>
>>> The kernel boot option "intel_iommu=igfx_off" prevents the error message.
>>
>> This seems to be resolved in newer kernel versions.
>> I'm not able to reproduce this with kernel version 5.14.0-4-amd64
>> (5.14.16-1).
> 
> Great that it is resolved :-)
> 
> As many people are affected and the Stable kernel version still seems to
> exhibit the problem, I want to ask a question:
> Are you willing to help out to narrow down as much as possible which version
> introduced the error and in which is was fixed? Wrt the latter, does 5.14.12-1
> still show the issue?

[...]

Just a small update: kernel version 5.13.9-1~exp2 is also not affected by the problem.

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Bug#962003: Linux kernel 5.6: [drm:i915_gem_gtt_finish_pages [i915]] *ERROR* Failed to wait for idle; VT'd may hang Stefan Pietsch <stefan+debian@shellforce.org> - 2022-12-30 02:00 +0100
  Bug#962003: Linux kernel 5.6: [drm:i915_gem_gtt_finish_pages [i915]] *ERROR* Failed to wait for idle; VT'd may hang Diederik de Haas <didi.debian@cknow.org> - 2022-12-30 13:00 +0100
    Bug#962003: Linux kernel 5.6: [drm:i915_gem_gtt_finish_pages [i915]] *ERROR* Failed to wait for idle; VT'd may hang Stefan Pietsch <stefan+debian@shellforce.org> - 2023-01-14 23:50 +0100

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