linux-kernel - Re: dealock in drm_fb_helper_damage

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Message-ID: <061ca923-866d-2d31-8084-f4133e05b171@collabora.com>
Date:   Mon, 14 Nov 2022 01:55:13 +0300
From:   Dmitry Osipenko <dmitry.osipenko@...labora.com>
To:     Dmitry Vyukov <dvyukov@...gle.com>,
        Dave Airlie <airlied@...il.com>,
        Daniel Vetter <daniel@...ll.ch>,
        DRI <dri-devel@...ts.freedesktop.org>,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Maxime Ripard <mripard@...nel.org>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        LKML <linux-kernel@...r.kernel.org>,
        Christian König <christian.koenig@....com>
Subject: Re: dealock in drm_fb_helper_damage_work

On 11/13/22 23:48, Dmitry Vyukov wrote:
>> Hi,
>>
>> I am getting the following deadlock on reservation_ww_class_mutex
>> while trying to boot next-20221111 kernel:
> The code is recently added by this commit:
> 
> commit 79e2cf2e7a193473dfb0da3b9b869682b43dc60f
> Author: Dmitry Osipenko <dmitry.osipenko@...labora.com>
> Date:   Mon Oct 17 20:22:11 2022 +0300
>     drm/gem: Take reservation lock for vmap/vunmap operations

Thanks for the report. I reproduced this problem using bochs driver,
will send the fix ASAP.

-- 
Best regards,
Dmitry