linux-kernel - Re: WARNING in drm_modeset_lock

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Message-ID: <CACT4Y+aQOWYhgJHn_AKUPVcx0Kek1xdDXDqTvU8KMdmz=tyvog@mail.gmail.com>
Date:   Mon, 12 Feb 2018 17:10:35 +0100
From:   Dmitry Vyukov <dvyukov@...gle.com>
To:     Chris Wilson <chris@...is-wilson.co.uk>
Cc:     syzbot 
        <bot+8de19a03d6fdf256eb2b90ec48916b6f47b9b5a3@...kaller.appspotmail.com>,
        daniel.vetter@...el.com, dri-devel@...ts.freedesktop.org,
        jani.nikula@...ux.intel.com, LKML <linux-kernel@...r.kernel.org>,
        Sean Paul <seanpaul@...omium.org>,
        syzkaller-bugs@...glegroups.com
Subject: Re: WARNING in drm_modeset_lock_all

On Tue, Oct 31, 2017 at 2:03 PM, Dmitry Vyukov <dvyukov@...gle.com> wrote:
> On Tue, Oct 31, 2017 at 3:45 PM, Chris Wilson <chris@...is-wilson.co.uk> wrote:
>> Quoting syzbot (2017-10-27 09:09:50)
>>> This bug is generated by a dumb bot. It may contain errors.
>>> See https://goo.gl/tpsmEJ for details.
>>> Direct all questions to syzkaller@...glegroups.com.
>>>
>>> syzbot will keep track of this bug report.
>>> Once a fix for this bug is committed, please reply to this email with:
>>> #syz fix: exact-commit-title
>>> To mark this as a duplicate of another syzbot report, please reply with:
>>> #syz dup: exact-subject-of-another-report
>>> If it's a one-off invalid bug report, please reply with:
>>> #syz invalid
>>> Note: if the crash happens again, it will cause creation of a new bug
>>> report.
>>
>> Can we use
>>
>> Reported-by: syzbot <bot+8de19a03d6fdf256eb2b90ec48916b6f47b9b5a3@...kaller.appspotmail.com>
>>
>> as a unique tag for tracking purposes?
>
>
> Hi,
>
> Seems to be a common question. I've added the following to bug template:
>
> Please credit me with: Reported-by: syzbot <syzkaller@...glegroups.com>
>
> will now be present on newly reported bugs:
>
> https://groups.google.com/forum/#!topic/syzkaller-bugs/XE8YSiSZDdA


This was fixed by:
#syz fix: drm: Require __GFP_NOFAIL for the legacy drm_modeset_lock_all


Now we indeed can use:
Reported-by: syzbot
<bot+8de19a03d6fdf256eb2b90ec48916b6f47b9b5a3@...kaller.appspotmail.com>
which avoids the need to go back and manually attach fixing commit to
the report like this.