linux-kernel - Re: [LKP] [bochs] df2052cc92: WARNING:at_drivers/gpu/drm/drm_mode_config.c:#drm_mode_config

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Message-ID: <CAHk-=whM09ZxdrrN-o3k1JOAn0keF5aXtPAcEYiukn7kW7yp2g@mail.gmail.com>
Date:   Fri, 21 Dec 2018 11:25:41 -0800
From:   Linus Torvalds <torvalds@...ux-foundation.org>
To:     rong.a.chen@...el.com
Cc:     peter@...ensteyn.nl, kraxel@...hat.com,
        Daniel Vetter <daniel.vetter@...ll.ch>,
        Linux List Kernel Mailing <linux-kernel@...r.kernel.org>,
        lkp@...org
Subject: Re: [LKP] [bochs] df2052cc92: WARNING:at_drivers/gpu/drm/drm_mode_config.c:#drm_mode_config_cleanup

On Fri, Dec 21, 2018 at 12:32 AM kernel test robot
<rong.a.chen@...el.com> wrote:
>
> FYI, we noticed commit df2052cc9221 ("bochs: convert to
> drm_fb_helper_fbdev_setup/teardown") caused
>
> [  487.591733] WARNING: CPU: 0 PID: 1 at drivers/gpu/drm/drm_mode_config.c:478 drm_mode_config_cleanup+0x270/0x290

Ok, this is apparently just a leak for what appears to be a not
particularly interesting error case, but the warning is new to 4.20
(*) so it would be nice to have somebody look at it.

That commit is supposed to fix a leak, but there's apparently
something still there.

Daniel, Peter, Gerd?

                       Linus

(*) the *problem* is probably not new, it's just now exposed by the
switch to drm_mode_config_cleanup().