linux-kernel - Re: [syzbot] [f2fs?] WARNING: lock held when returning to user space in f2fs_ioc_start_atomic

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Message-ID: <d4106e72-8a88-42d4-9300-233751e239bb@kernel.org>
Date: Thu, 5 Sep 2024 09:29:52 +0800
From: Chao Yu <chao@...nel.org>
To: syzbot <syzbot+733300ca0a9baca7e245@...kaller.appspotmail.com>,
 jaegeuk@...nel.org, linux-f2fs-devel@...ts.sourceforge.net,
 linux-kernel@...r.kernel.org, syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [f2fs?] WARNING: lock held when returning to user space
 in f2fs_ioc_start_atomic_write

#syz fix: f2fs: atomic: fix to forbid dio in atomic_file

On 2024/8/14 19:51, syzbot wrote:
> Hello,
> 
> syzbot found the following issue on:
> 
> HEAD commit:    9e6869691724 Add linux-next specific files for 20240812
> git tree:       linux-next
> console+strace: https://syzkaller.appspot.com/x/log.txt?x=1431e405980000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=61ba6f3b22ee5467
> dashboard link: https://syzkaller.appspot.com/bug?extid=733300ca0a9baca7e245
> 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=120ed77d980000
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=130e0ef3980000
> 
> Downloadable assets:
> disk image: https://storage.googleapis.com/syzbot-assets/f1b086192f50/disk-9e686969.raw.xz
> vmlinux: https://storage.googleapis.com/syzbot-assets/b457920fb52e/vmlinux-9e686969.xz
> kernel image: https://storage.googleapis.com/syzbot-assets/e63ba9cce98a/bzImage-9e686969.xz
> mounted in repro: https://storage.googleapis.com/syzbot-assets/08b48c782593/mount_0.gz
> 
> The issue was bisected to:
> 
> commit 374a8881ce4ccf787f5381a39f825cb17a3f6b14
> Author: Chao Yu <chao@...nel.org>
> Date:   Tue Jun 25 03:13:51 2024 +0000
> 
>      f2fs: atomic: fix to forbid dio in atomic_file
> 
> bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=10741429980000
> final oops:     https://syzkaller.appspot.com/x/report.txt?x=12741429980000
> console output: https://syzkaller.appspot.com/x/log.txt?x=14741429980000
> 
> IMPORTANT: if you fix the issue, please add the following tag to the commit:
> Reported-by: syzbot+733300ca0a9baca7e245@...kaller.appspotmail.com
> Fixes: 374a8881ce4c ("f2fs: atomic: fix to forbid dio in atomic_file")
> 
> F2FS-fs (loop0): Found nat_bits in checkpoint
> F2FS-fs (loop0): Mounted with checkpoint version = 48b305e5
> syz-executor312: attempt to access beyond end of device
> loop0: rw=10241, sector=45096, nr_sectors = 8 limit=40427
> ================================================
> WARNING: lock held when returning to user space!
> 6.11.0-rc3-next-20240812-syzkaller #0 Not tainted
> ------------------------------------------------
> syz-executor312/5227 is leaving the kernel with locks still held!
> 1 lock held by syz-executor312/5227:
>   #0: ffff8880695aa0e0 (&fi->i_gc_rwsem[READ]){+.+.}-{3:3}, at: f2fs_down_write fs/f2fs/f2fs.h:2196 [inline]
>   #0: ffff8880695aa0e0 (&fi->i_gc_rwsem[READ]){+.+.}-{3:3}, at: f2fs_ioc_start_atomic_write+0x2ed/0xac0 fs/f2fs/file.c:2163
> 
> 
> ---
> This report is generated by a bot. It may contain errors.
> See https://goo.gl/tpsmEJ for more information about syzbot.
> syzbot engineers can be reached at syzkaller@...glegroups.com.
> 
> syzbot will keep track of this issue. See:
> https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
> For information about bisection process see: https://goo.gl/tpsmEJ#bisection
> 
> If the report is already addressed, let syzbot know by replying with:
> #syz fix: exact-commit-title
> 
> If you want syzbot to run the reproducer, reply with:
> #syz test: git://repo/address.git branch-or-commit-hash
> If you attach or paste a git patch, syzbot will apply it before testing.
> 
> If you want to overwrite report's subsystems, reply with:
> #syz set subsystems: new-subsystem
> (See the list of subsystem names on the web dashboard)
> 
> If the report is a duplicate of another one, reply with:
> #syz dup: exact-subject-of-another-report
> 
> If you want to undo deduplication, reply with:
> #syz undup