Message-ID: <0000000000007dfbdb061fa35855@google.com>
Date: Wed, 14 Aug 2024 04:51:25 -0700
From: syzbot <syzbot+733300ca0a9baca7e245@...kaller.appspotmail.com>
To: chao@...nel.org, jaegeuk@...nel.org, 
	linux-f2fs-devel@...ts.sourceforge.net, linux-kernel@...r.kernel.org, 
	syzkaller-bugs@...glegroups.com
Subject: [syzbot] [f2fs?] WARNING: lock held when returning to user space in f2fs_ioc_start_atomic_write

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.

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For information about bisection process see: https://goo.gl/tpsmEJ#bisection

If the report is already addressed, let syzbot know by replying with:
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