linux-kernel - Re: [syzbot] [fs?] [io-uring?] WARNING: locking bug in eventfd_signal

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Message-ID: <616118a2-e440-45c6-a548-a1cdb1b586f2@kernel.dk>
Date: Mon, 30 Dec 2024 14:19:16 -0700
From: Jens Axboe <axboe@...nel.dk>
To: syzbot <syzbot+b1fc199a40b65d601b65@...kaller.appspotmail.com>,
 asml.silence@...il.com, bigeasy@...utronix.de, brauner@...nel.org,
 clrkwllms@...nel.org, io-uring@...r.kernel.org, jack@...e.cz,
 linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
 linux-rt-devel@...ts.linux.dev, rostedt@...dmis.org,
 syzkaller-bugs@...glegroups.com, viro@...iv.linux.org.uk
Subject: Re: [syzbot] [fs?] [io-uring?] WARNING: locking bug in
 eventfd_signal_mask

On 12/29/24 2:01 AM, syzbot wrote:
> Hello,
> 
> syzbot found the following issue on:
> 
> HEAD commit:    9b2ffa6148b1 Merge tag 'mtd/fixes-for-6.13-rc5' of git://g..
> git tree:       upstream
> console+strace: https://syzkaller.appspot.com/x/log.txt?x=128f74c4580000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=d269ef41b9262400
> dashboard link: https://syzkaller.appspot.com/bug?extid=b1fc199a40b65d601b65
> compiler:       Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=1469890f980000
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=154b22f8580000
> 
> Downloadable assets:
> disk image: https://storage.googleapis.com/syzbot-assets/9015cc2b19ac/disk-9b2ffa61.raw.xz
> vmlinux: https://storage.googleapis.com/syzbot-assets/3ddeabd5e7eb/vmlinux-9b2ffa61.xz
> kernel image: https://storage.googleapis.com/syzbot-assets/36e13b0305d0/bzImage-9b2ffa61.xz
> 
> The issue was bisected to:
> 
> commit 020b40f3562495f3c703a283ece145ffec19e82d
> Author: Jens Axboe <axboe@...nel.dk>
> Date:   Tue Dec 17 15:21:46 2024 +0000
> 
>     io_uring: make ctx->timeout_lock a raw spinlock

#syz test: git://git.kernel.dk/linux io_uring-6.13

-- 
Jens Axboe