linux-kernel - Re: BUG: unable to handle kernel paging request in io_wq_cancel

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Date:   Fri, 1 Nov 2019 19:03:10 +0100
From:   Dmitry Vyukov <dvyukov@...gle.com>
To:     Jens Axboe <axboe@...nel.dk>
Cc:     syzbot <syzbot+221cc24572a2fed23b6b@...kaller.appspotmail.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Dan Williams <dan.j.williams@...el.com>,
        David Howells <dhowells@...hat.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Johannes Weiner <hannes@...xchg.org>,
        Joel Fernandes <joel@...lfernandes.org>,
        linux-block <linux-block@...r.kernel.org>,
        linux-fsdevel <linux-fsdevel@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>, mchehab+samsung@...nel.org,
        Ingo Molnar <mingo@...hat.com>, patrick.bellasi@....com,
        Richard Guy Briggs <rgb@...hat.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        syzkaller-bugs <syzkaller-bugs@...glegroups.com>,
        Al Viro <viro@...iv.linux.org.uk>,
        Masahiro Yamada <yamada.masahiro@...ionext.com>
Subject: Re: BUG: unable to handle kernel paging request in io_wq_cancel_all

On Fri, Nov 1, 2019 at 6:56 PM Jens Axboe <axboe@...nel.dk> wrote:
>
> On 11/1/19 11:50 AM, Dmitry Vyukov wrote:
> > On Wed, Oct 30, 2019 at 3:41 PM Jens Axboe <axboe@...nel.dk> wrote:
> >>
> >> On 10/30/19 1:44 AM, syzbot wrote:
> >>> syzbot has bisected this bug to:
> >>>
> >>> commit ef0524d3654628ead811f328af0a4a2953a8310f
> >>> Author: Jens Axboe <axboe@...nel.dk>
> >>> Date:   Thu Oct 24 13:25:42 2019 +0000
> >>>
> >>>        io_uring: replace workqueue usage with io-wq
> >>>
> >>> bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=16acf5d0e00000
> >>> start commit:   c57cf383 Add linux-next specific files for 20191029
> >>> git tree:       linux-next
> >>> final crash:    https://syzkaller.appspot.com/x/report.txt?x=15acf5d0e00000
> >>> console output: https://syzkaller.appspot.com/x/log.txt?x=11acf5d0e00000
> >>> kernel config:  https://syzkaller.appspot.com/x/.config?x=cb86688f30db053d
> >>> dashboard link: https://syzkaller.appspot.com/bug?extid=221cc24572a2fed23b6b
> >>> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=168671d4e00000
> >>> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=140f4898e00000
> >>>
> >>> Reported-by: syzbot+221cc24572a2fed23b6b@...kaller.appspotmail.com
> >>> Fixes: ef0524d36546 ("io_uring: replace workqueue usage with io-wq")
> >>
> >> Good catch, it's a case of NULL vs ERR_PTR() confusion. I'll fold in
> >> the below fix.
> >
> > Hi Jens,
> >
> > Please either add the syzbot tag to commit, or close manually with
> > "#syz fix" (though requires waiting until the fixed commit is in
> > linux-next).
> > See https://goo.gl/tpsmEJ#rebuilt-treesamended-patches for details.
> > Otherwise, the bug will be considered open and will waste time of
> > humans looking at open bugs and prevent syzbot from reporting new bugs
> > in io_uring.
>
> It's queued up since two days ago:
>
> http://git.kernel.dk/cgit/linux-block/commit/?h=for-5.5/io_uring&id=975c99a570967dd48e917dd7853867fee3febabd
>
> and should have the right attributions, so hopefully it'll catch up
> eventually.
>
> --
> Jens Axboe
>

Cool! Thanks!
I've seen "fold in" and historically lots of developers did not add
the tag during amending, so wanted to double check.