linux-kernel - Re: [Bug][5.18-rc0] Between commits ed4643521e6a and 34af78c4e616, appears warning "WARNING: CPU: 31 PID: 51848 at drivers/dma-buf/dma-fence-array.c:191 dma_fence_array_create+0x101/0x120" and some games stopped working.

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Message-ID: <eef04fc4-741d-606c-c2c6-f054e4e3fffd@amd.com>
Date:   Fri, 8 Apr 2022 16:27:19 +0200
From:   Christian König <christian.koenig@....com>
To:     Mikhail Gavrilov <mikhail.v.gavrilov@...il.com>
Cc:     Ken.Xue@....com, "Deucher, Alexander" <alexander.deucher@....com>,
        amd-gfx list <amd-gfx@...ts.freedesktop.org>,
        Daniel Vetter <daniel.vetter@...ll.ch>,
        thomas.hellstrom@...ux.intel.com,
        Linux List Kernel Mailing <linux-kernel@...r.kernel.org>
Subject: Re: [Bug][5.18-rc0] Between commits ed4643521e6a and 34af78c4e616,
 appears warning "WARNING: CPU: 31 PID: 51848 at
 drivers/dma-buf/dma-fence-array.c:191 dma_fence_array_create+0x101/0x120" and
 some games stopped working.

Am 08.04.22 um 14:24 schrieb Mikhail Gavrilov:
> On Fri, 8 Apr 2022 at 16:13, Christian König <christian.koenig@....com> wrote:
>
>> I own you a beer.
>>
>> I still don't know what happens here, but that makes at least a bit more
>> sense than a patch which only changes comments :)
>>
>> Looks like we are missing something here. Can I send you a patch to try
>> something later today?
> Yes, please feel free to send me a patch for testing.
>

Please test the attached patch, it just re-introduce the lock without 
doing much else.

And does your branch contain the following patch:

commit d18b8eadd83e3d8d63a45f9479478640dbcfca02
Author: Christian König <christian.koenig@....com>
Date:   Wed Feb 23 14:35:31 2022 +0100

     drm/amdgpu: install ctx entities with cmpxchg

     Since we removed the context lock we need to make sure that not two 
threads
     are trying to install an entity at the same time.

     Signed-off-by: Christian König <christian.koenig@....com>
     Fixes: 461fa7b0ac565e ("drm/amdgpu: remove ctx->lock")
     Reviewed-by: Andrey Grodzovsky <andrey.grodzovsky@....com>
     Signed-off-by: Alex Deucher <alexander.deucher@....com>

Thanks,
Christian.
View attachment "0001-drm-amdgpu-partial-revert-remove-ctx-lock.patch" of type "text/x-patch" (2754 bytes)