linux-kernel - Re: Radeon regression in 6.6 kernel

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <87wmu0ux3t.fsf@vps.thesusis.net>
Date:   Wed, 29 Nov 2023 15:24:06 -0500
From:   Phillip Susi <phill@...susis.net>
To:     Luben Tuikov <ltuikov89@...il.com>,
        Alex Deucher <alexdeucher@...il.com>
Cc:     Linux regressions mailing list <regressions@...ts.linux.dev>,
        Christian König 
        <ckoenig.leichtzumerken@...il.com>, linux-kernel@...r.kernel.org,
        "amd-gfx@...ts.freedesktop.org" <amd-gfx@...ts.freedesktop.org>,
        dri-devel@...ts.freedesktop.org,
        Alex Deucher <alexander.deucher@....com>,
        Christian König <christian.koenig@....com>,
        Danilo Krummrich <dakr@...hat.com>
Subject: Re: Radeon regression in 6.6 kernel

Luben Tuikov <ltuikov89@...il.com> writes:

> I remember that the problem was really that amdgpu called drm_sched_entity_init(),
> in amdgpu_ttm_set_buffer_funcs_status() without actually having initialized the scheduler
> used therein. For instance, the code before commit b70438004a14f4, looked like this:
>

<snip>

> 		sched = &ring->sched;                             <-- LT: No one has initialized this scheduler
>	        r = drm_sched_entity_init(&adev->mman.entity,     <-- Oopses, now that sched->sched_rq is not

<snip>

> Before commit 56e449603f0ac5, amdgpu was getting away with this, because the sched->sched_rq
> was a static array.
>
> Ideally, amdgpu code would be fixed.

This sounds like an initilization problem that resulted in an OOPS at
boot time, but I don't remember seeing that.  I just get a failure on
system suspend.