Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67;
Subject: Re: KASAN: invalid-free in io_sqe_files_unregister
To:     syzbot <syzbot+3254bc44113ae1e331ee@syzkaller.appspotmail.com>,
        io-uring@vger.kernel.org, linux-block@vger.kernel.org,
        linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org,
        syzkaller-bugs@googlegroups.com, viro@zeniv.linux.org.uk
References: <000000000000e11df90596fc9955@google.com>
From:   Jens Axboe <axboe@kernel.dk>
Message-ID: <e3ed8352-23ca-246d-088c-878f9da82c76@kernel.dk>
Date:   Sun, 10 Nov 2019 08:46:06 -0700
User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101
 Thunderbird/60.9.0
MIME-Version: 1.0
In-Reply-To: <000000000000e11df90596fc9955@google.com>
Content-Type: text/plain; charset=utf-8
Content-Language: en-US
Content-Transfer-Encoding: 7bit
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

On 11/10/19 4:49 AM, syzbot wrote:
> syzbot has bisected this bug to:
> 
> commit 65e19f54d29cd8559ce60cfd0d751bef7afbdc5c
> Author: Jens Axboe <axboe@kernel.dk>
> Date:   Sat Oct 26 13:20:21 2019 +0000
> 
>       io_uring: support for larger fixed file sets
> 
> bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=154f483ce00000
> start commit:   5591cf00 Add linux-next specific files for 20191108
> git tree:       linux-next
> final crash:    https://syzkaller.appspot.com/x/report.txt?x=174f483ce00000
> console output: https://syzkaller.appspot.com/x/log.txt?x=134f483ce00000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=e1036c6ef52866f9
> dashboard link: https://syzkaller.appspot.com/bug?extid=3254bc44113ae1e331ee
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=116bb33ae00000
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=173f133ae00000
> 
> Reported-by: syzbot+3254bc44113ae1e331ee@syzkaller.appspotmail.com
> Fixes: 65e19f54d29c ("io_uring: support for larger fixed file sets")
> 
> For information about bisection process see: https://goo.gl/tpsmEJ#bisection

Thanks, I queued up a fix:

https://git.kernel.dk/cgit/linux-block/commit/?h=for-5.5/io_uring&id=fc2a85cb02efd7bdbd09ea5d2d9847937da7bff7

-- 
Jens Axboe