linux-kernel - Re: LKML admins (syzbot emails are not delivered)

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Date:   Mon, 15 Jan 2018 14:38:30 +0100
From:   Dmitry Vyukov <dvyukov@...gle.com>
To:     Pavel Machek <pavel@....cz>
Cc:     Mike Galbraith <efault@....de>,
        LKML <linux-kernel@...r.kernel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        syzkaller <syzkaller@...glegroups.com>
Subject: Re: LKML admins (syzbot emails are not delivered)

On Mon, Jan 15, 2018 at 2:08 PM, Pavel Machek <pavel@....cz> wrote:
> On Mon 2018-01-15 11:08:12, Dmitry Vyukov wrote:
>> On Thu, Jan 4, 2018 at 12:18 PM, Pavel Machek <pavel@....cz> wrote:
>> > On Thu 2018-01-04 12:09:26, Dmitry Vyukov wrote:
>> >> On Thu, Jan 4, 2018 at 10:56 AM, Pavel Machek <pavel@....cz> wrote:
>> >> >> On Thu, 2018-01-04 at 10:25 +0100, Pavel Machek wrote:
>> >> >> > Hi!
>> >> >> > >
>> >> >> > > Some of syzbot emails don't appear on LKML mailing lists, while they
>> >> >> > > were mailed as any other emails. Here are few examples:
>> >> >> > >
>> >> >> > > "KASAN: use-after-free Read in rds_tcp_dev_event"
>> >> >> > > https://groups.google.com/d/msg/syzkaller-bugs/nEeIAsNLWL4/1GzamOmRAwAJ
>> >> >> > >
>> >> >> > > "general protection fault in __wake_up_common"
>> >> >> > > https://groups.google.com/d/msg/syzkaller-bugs/4TrrZ0bIViw/rBcYLUJHAgAJ
>> >> >> > >
>> >> >> > > Does anybody know how to get in contact with real people behind LKML
>> >> >> > > and/or bugzilla?
>> >> >> >
>> >> >> > Not delivering syzbot emails might be good thing?
>> >> >>
>> >> >> Nah, the thing is finding and reporting bugs just like a human would,
>> >> >> it just doesn't need sleep etc, so sometimes reports more than humans
>> >> >> can keep up with.  It needs a smarter brother.. but then again, maybe
>> >> >> not, if bots start fixing things too, a lot of meatware hackers would
>> >> >> have to go find real jobs.
>> >> >
>> >> > Sending random, unrepeatable Oopses to lkml is not what humans would
>> >> > do, and perhaps not something bots should do, either.
>> >>
>> >>
>> >> Hi Pavel,
>> >>
>> >> I've answered this question here in full detail. In short, this is
>> >> useful and actionable.
>> >> https://groups.google.com/d/msg/syzkaller/2nVn_XkVhEE/GjjfISejCgAJ
>> >
>> > I've already deleted many such reports from my lkml folder. It
>> > definitely is below quality of normal bug reports.
>>
>>
>> Pavel, if you point to exact deficiencies in the process and propose
>> ways to improve it, we can turn this into a positive, constructive and
>> actionable discussion.
>>
>> In lots of cases (~50%) quality of syzbot reports is equal to human
>> reports, or _higher_.
>> It provides exact kernel commit, config, compiler, stand-alone C
>> reproducer and a nice, symbolized report even with inline frames. You
>> don't always get all of this from human reports.
>>
>> In the remaining cases (no reproducer), quality of syzbot reports is
>> the _same_ as for human reports.
>> Say, your machine randomly crashes. You reboot it, but it crashes
>> again after some time. You try to repeat what you did before the crash
>> (say, opened a particular web page), but it does not reproduce the
>> crash. But one way or another, it happened and it's a kernel bug
>
> I have not seen a good quality report from syzbot, yet.

I don't know how many you checked, so I don't know how to interpret this.
If you want to see one, grep kernel commit log for syzbot, get bug id,
search for it in
https://groups.google.com/forum/#!forum/syzkaller-bugs


> Normally, humans agregate test reports, and test patches etc. Can you
> step between robot and lkml, and provide same services humans usually
> provide?

syzbot does all of this already.