From: Jani Nikula <jani.nikula@linux.intel.com>
To: Al Viro <viro@zeniv.linux.org.uk>,
syzbot <syzbot+1505c80c74256c6118a5@syzkaller.appspotmail.com>
Cc: jack@suse.cz, penguin-kernel@i-love.sakura.ne.jp,
david@fromorbit.com, dri-devel@lists.freedesktop.org,
linux-mm@kvack.org, darrick.wong@oracle.com, hughd@google.com,
willy@infradead.org, airlied@linux.ie, mingo@redhat.com,
mszeredi@redhat.com, amir73il@gmail.com,
intel-gfx@lists.freedesktop.org, syzkaller-bugs@googlegroups.com,
rodrigo.vivi@intel.com, dvyukov@google.com,
linux-kernel@vger.kernel.org, eparis@redhat.com,
peterz@infradead.org, jrdr.linux@gmail.com, hannes@cmpxchg.org,
akpm@linux-foundation.org
Subject: Re: INFO: rcu detected stall in sys_sendfile64 (2)
Date: Tue, 12 Mar 2019 10:00:36 +0200 [thread overview]
Message-ID: <871s3cfrob.fsf@intel.com> (raw)
In-Reply-To: <20190312040829.GQ2217@ZenIV.linux.org.uk>
On Tue, 12 Mar 2019, Al Viro <viro@zeniv.linux.org.uk> wrote:
> On Mon, Mar 11, 2019 at 08:59:00PM -0700, syzbot wrote:
>> syzbot has bisected this bug to:
>>
>> commit 34e07e42c55aeaa78e93b057a6664e2ecde3fadb
>> Author: Chris Wilson <chris@chris-wilson.co.uk>
>> Date: Thu Feb 8 10:54:48 2018 +0000
>>
>> drm/i915: Add missing kerneldoc for 'ent' in i915_driver_init_early
>>
>> bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=13220283200000
>> start commit: 34e07e42 drm/i915: Add missing kerneldoc for 'ent' in i915..
>> git tree: upstream
>> final crash: https://syzkaller.appspot.com/x/report.txt?x=10a20283200000
>> console output: https://syzkaller.appspot.com/x/log.txt?x=17220283200000
>> kernel config: https://syzkaller.appspot.com/x/.config?x=abc3dc9b7a900258
>> dashboard link: https://syzkaller.appspot.com/bug?extid=1505c80c74256c6118a5
>> userspace arch: amd64
>> syz repro: https://syzkaller.appspot.com/x/repro.syz?x=12c4dc28c00000
>> C reproducer: https://syzkaller.appspot.com/x/repro.c?x=15df4108c00000
>>
>> Reported-by: syzbot+1505c80c74256c6118a5@syzkaller.appspotmail.com
>> Fixes: 34e07e42 ("drm/i915: Add missing kerneldoc for 'ent' in
>> i915_driver_init_early")
>
> Umm... Might be a good idea to add some plausibility filters - it is,
> in theory, possible that adding a line in a comment changes behaviour
> (without compiler bugs, even - playing with __LINE__ is all it would
> take), but the odds that it's _not_ a false positive are very low.
If it's not a false positive, it's bound to be good source material for
IOCCC.
BR,
Jani.
--
Jani Nikula, Intel Open Source Graphics Center
_______________________________________________
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dri-devel@lists.freedesktop.org
https://lists.freedesktop.org/mailman/listinfo/dri-devel
WARNING: multiple messages have this Message-ID (diff)
From: Jani Nikula <jani.nikula@linux.intel.com>
To: Al Viro <viro@zeniv.linux.org.uk>,
syzbot <syzbot+1505c80c74256c6118a5@syzkaller.appspotmail.com>
Cc: airlied@linux.ie, akpm@linux-foundation.org, amir73il@gmail.com,
chris@chris-wilson.co.uk, darrick.wong@oracle.com,
david@fromorbit.com, dri-devel@lists.freedesktop.org,
dvyukov@google.com, eparis@redhat.com, hannes@cmpxchg.org,
hughd@google.com, intel-gfx@lists.freedesktop.org, jack@suse.cz,
joonas.lahtinen@linux.intel.com, jrdr.linux@gmail.com,
linux-kernel@vger.kernel.org, linux-mm@kvack.org,
mingo@redhat.com, mszeredi@redhat.com,
penguin-kernel@i-love.sakura.ne.jp, peterz@infradead.org,
rodrigo.vivi@intel.com, syzkaller-bugs@googlegroups.com,
willy@infradead.org
Subject: Re: INFO: rcu detected stall in sys_sendfile64 (2)
Date: Tue, 12 Mar 2019 10:00:36 +0200 [thread overview]
Message-ID: <871s3cfrob.fsf@intel.com> (raw)
In-Reply-To: <20190312040829.GQ2217@ZenIV.linux.org.uk>
On Tue, 12 Mar 2019, Al Viro <viro@zeniv.linux.org.uk> wrote:
> On Mon, Mar 11, 2019 at 08:59:00PM -0700, syzbot wrote:
>> syzbot has bisected this bug to:
>>
>> commit 34e07e42c55aeaa78e93b057a6664e2ecde3fadb
>> Author: Chris Wilson <chris@chris-wilson.co.uk>
>> Date: Thu Feb 8 10:54:48 2018 +0000
>>
>> drm/i915: Add missing kerneldoc for 'ent' in i915_driver_init_early
>>
>> bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=13220283200000
>> start commit: 34e07e42 drm/i915: Add missing kerneldoc for 'ent' in i915..
>> git tree: upstream
>> final crash: https://syzkaller.appspot.com/x/report.txt?x=10a20283200000
>> console output: https://syzkaller.appspot.com/x/log.txt?x=17220283200000
>> kernel config: https://syzkaller.appspot.com/x/.config?x=abc3dc9b7a900258
>> dashboard link: https://syzkaller.appspot.com/bug?extid=1505c80c74256c6118a5
>> userspace arch: amd64
>> syz repro: https://syzkaller.appspot.com/x/repro.syz?x=12c4dc28c00000
>> C reproducer: https://syzkaller.appspot.com/x/repro.c?x=15df4108c00000
>>
>> Reported-by: syzbot+1505c80c74256c6118a5@syzkaller.appspotmail.com
>> Fixes: 34e07e42 ("drm/i915: Add missing kerneldoc for 'ent' in
>> i915_driver_init_early")
>
> Umm... Might be a good idea to add some plausibility filters - it is,
> in theory, possible that adding a line in a comment changes behaviour
> (without compiler bugs, even - playing with __LINE__ is all it would
> take), but the odds that it's _not_ a false positive are very low.
If it's not a false positive, it's bound to be good source material for
IOCCC.
BR,
Jani.
--
Jani Nikula, Intel Open Source Graphics Center
next prev parent reply other threads:[~2019-03-12 8:00 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-01-19 11:32 INFO: rcu detected stall in sys_sendfile64 (2) syzbot
2019-01-19 11:41 ` Dmitry Vyukov
2019-01-19 13:00 ` Tetsuo Handa
2019-03-12 3:59 ` syzbot
2019-03-12 4:08 ` Al Viro
2019-03-12 8:00 ` Jani Nikula [this message]
2019-03-12 8:00 ` Jani Nikula
2019-03-12 14:29 ` Tetsuo Handa
2019-03-12 14:29 ` Tetsuo Handa
2019-03-12 17:15 ` Dmitry Vyukov
2019-03-12 21:11 ` Tetsuo Handa
2019-03-13 6:43 ` Dmitry Vyukov
2019-03-13 16:37 ` Theodore Ts'o
2019-03-13 16:56 ` Dmitry Vyukov
2019-03-13 23:40 ` Eric Biggers
2019-03-14 10:52 ` Tetsuo Handa
2019-03-20 12:49 ` Dmitry Vyukov
2019-03-20 13:45 ` Dmitry Vyukov
2019-03-12 17:10 ` Dmitry Vyukov
2019-03-12 17:10 ` Dmitry Vyukov
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