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Subject: Re: [BUG] VAAPI encoder cause kernel panic if encoded video in 4K
To:     Mikhail Gavrilov <mikhail.v.gavrilov@gmail.com>,
        =?UTF-8?Q?Christian_K=c3=b6nig?= <christian.koenig@amd.com>
Cc:     Linux List Kernel Mailing <linux-kernel@vger.kernel.org>,
        amd-gfx list <amd-gfx@lists.freedesktop.org>
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From:   =?UTF-8?Q?Christian_K=c3=b6nig?= <ckoenig.leichtzumerken@gmail.com>
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Date:   Wed, 14 Apr 2021 08:48:58 +0200
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Am 13.04.21 um 23:19 schrieb Mikhail Gavrilov:
> On Tue, 13 Apr 2021 at 12:29, Christian König <christian.koenig@amd.com> wrote:
>> Hi Mikhail,
>>
>> the crash is a known issue and should be fixed by:
>>
>> commit f63da9ae7584280582cbc834b20cc18bfb203b14
>> Author: Philip Yang <Philip.Yang@amd.com>
>> Date:   Thu Apr 1 00:22:23 2021 -0400
>>
>>       drm/amdgpu: reserve fence slot to update page table
>>
> Unfortunately, this commit couldn't fix the initial problem.
> 1. Result video is jerky if it grabbed and encoded with ffmpeg
> (h264_vaapi codec).
> 2. OBS still crashed if I try to record or stream video.
> 3. In the kernel log still appears the message "amdgpu: [mmhub] page
> fault (src_id:0 ring:0 vmid:4 pasid:32770, for process obs" if I tried
> to record or stream video by OBS.

That is expected behavior, the application is just buggy and causing a 
page fault on the GPU.

The kernel should just not crash with a backtrace.

Regards,
Christian.