Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18;
MIME-Version: 1.0
References: <00000000000061316205b0e750fc@google.com> <0000000000004cb88b05b2e8d1b4@google.com>
 <CACVXFVNk9Os+2Bzht+eoeFZr=E-FCBZg2SSYx5AP_eu_-3zF3w@mail.gmail.com>
In-Reply-To: <CACVXFVNk9Os+2Bzht+eoeFZr=E-FCBZg2SSYx5AP_eu_-3zF3w@mail.gmail.com>
From:   Dmitry Vyukov <dvyukov@google.com>
Date:   Fri, 13 Nov 2020 13:10:06 +0100
Message-ID: <CACT4Y+YrLRueFzXqNrWcy5ic-TsAJz393G+fg_4x1zfMo061oQ@mail.gmail.com>
Subject: Re: INFO: task can't die in nbd_ioctl
To:     Ming Lei <tom.leiming@gmail.com>
Cc:     syzbot <syzbot+69a90a5e8f6b59086b2a@syzkaller.appspotmail.com>,
        Jens Axboe <axboe@kernel.dk>,
        Josef Bacik <josef@toxicpanda.com>,
        linux-block <linux-block@vger.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        nbd@other.debian.org,
        syzkaller-bugs <syzkaller-bugs@googlegroups.com>
Content-Type: text/plain; charset="UTF-8"
Precedence: bulk

On Tue, Nov 3, 2020 at 8:21 AM Ming Lei <tom.leiming@gmail.com> wrote:
>
> On Sat, Oct 31, 2020 at 4:01 AM syzbot
> <syzbot+69a90a5e8f6b59086b2a@syzkaller.appspotmail.com> wrote:
> >
> > syzbot has found a reproducer for the following issue on:
> >
> > HEAD commit:    4e78c578 Add linux-next specific files for 20201030
> > git tree:       linux-next
> > console output: https://syzkaller.appspot.com/x/log.txt?x=158c1798500000
> > kernel config:  https://syzkaller.appspot.com/x/.config?x=83318758268dc331
> > dashboard link: https://syzkaller.appspot.com/bug?extid=69a90a5e8f6b59086b2a
> > compiler:       gcc (GCC) 10.1.0-syz 20200507
> > syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=15e051a8500000
> > C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=15bf75b8500000
>
> Not reproduce this issue by above C reproducer with the kernel config
> in hours running
> on linus tree.

Let's see how reproducible this is by syzbot:

#syz test: git://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next-history.git
4e78c578