linux-kernel - Re: WARNING in generic_make_request

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Date:   Thu, 28 Nov 2019 09:52:03 +0100
From:   Dmitry Vyukov <dvyukov@...gle.com>
To:     Kees Cook <keescook@...omium.org>,
        syzkaller <syzkaller@...glegroups.com>
Cc:     syzbot <syzbot+21cfe1f803e0e158acf1@...kaller.appspotmail.com>,
        00moses.alexander00@...il.com, Jens Axboe <axboe@...nel.dk>,
        Bart Van Assche <bvanassche@....org>,
        Hannes Reinecke <hare@...e.com>,
        Christoph Hellwig <hch@....de>,
        Ilya Dryomov <idryomov@...il.com>, joseph.qi@...ux.alibaba.com,
        Johannes Thumshirn <jthumshirn@...e.de>,
        linux-block <linux-block@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Ming Lei <ming.lei@...hat.com>,
        Sagi Grimberg <sagi@...mberg.me>,
        Mike Snitzer <snitzer@...hat.com>,
        syzkaller-bugs <syzkaller-bugs@...glegroups.com>,
        Tejun Heo <tj@...nel.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>, wgh@...lan.ru,
        zkabelac@...hat.com
Subject: Re: WARNING in generic_make_request_checks

On Wed, Nov 27, 2019 at 8:26 PM Kees Cook <keescook@...omium.org> wrote:
>
> On Tue, Nov 26, 2019 at 11:45:00PM -0800, syzbot wrote:
> > Hello,
> >
> > syzbot has tested the proposed patch and the reproducer did not trigger
> > crash:
> >
> > Reported-and-tested-by:
> > syzbot+21cfe1f803e0e158acf1@...kaller.appspotmail.com
> >
> > Tested on:
> >
> > commit:         8b2ded1c block: don't warn when doing fsync on read-only d..
> > git tree:
> > git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
> > kernel config:  https://syzkaller.appspot.com/x/.config?x=d727e10a28207217
> > dashboard link: https://syzkaller.appspot.com/bug?extid=21cfe1f803e0e158acf1
> > compiler:       gcc (GCC) 9.0.0 20181231 (experimental)
> >
> > Note: testing is done by a robot and is best-effort only.
>
> It seems for successful tests, I still need to tell syzbot that this is
> fixed?

+syzkaller mailing list for syzbot discussion

Yes.
You used a commit. But patch testing may work with raw attached
patches, or on trees that are not merged, or it may just a trial run
on HEAD or run with additional debugging only and it may incidentally
succeed; or may be not incidentally but the patch disables part of
functionality just to check if it affects the crash or not, but it's
totally not a fix for the bug.
Nobody ever figured out how all of this could work; allocate time to
write a complete proposal for the workflow and implement this.
So at the moment patch testing functionality is completely unrelated
to the rest of the workflow. It's a convenience feature.


> #syz fix: block: don't warn when doing fsync on read-only devices
>
> --
> Kees Cook
>
> --
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