[f2fs-dev] [syzbot] [f2fs?] WARNING: lock held when returning to user space in f2fs_commit_atomic_write

[syzbot <syzbot+78ff2855f26377625419@syzkaller.appspotmail.com>]

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=177ea68d980000
kernel config:  https://syzkaller.appspot.com/x/.config?x=61ba6f3b22ee5467
dashboard link: https://syzkaller.appspot.com/bug?extid=78ff2855f26377625419
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=13deecd5980000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=12c1fdd9980000

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/a0c7f05fa485/mount_0.gz

The issue was bisected to:

commit 7566a155c666dd23b413a002a50cd9ae7b95f053
Author: Chao Yu <chao@kernel.org>
Date:   Tue Jun 25 03:13:49 2024 +0000

    f2fs: atomic: fix to not allow GC to pollute atomic_file

bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=1255068d980000
final oops:     https://syzkaller.appspot.com/x/report.txt?x=1155068d980000
console output: https://syzkaller.appspot.com/x/log.txt?x=1655068d980000

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+78ff2855f26377625419@syzkaller.appspotmail.com
Fixes: 7566a155c666 ("f2fs: atomic: fix to not allow GC to pollute atomic_file")

F2FS-fs (loop0): Found nat_bits in checkpoint
F2FS-fs (loop0): Try to recover 1th superblock, ret: 0
F2FS-fs (loop0): Mounted with checkpoint version = 48b305e4
syz-executor306: attempt to access beyond end of device
loop0: rw=2049, sector=45096, nr_sectors = 64 limit=40427
================================================
WARNING: lock held when returning to user space!
6.11.0-rc3-next-20240812-syzkaller #0 Not tainted
------------------------------------------------
syz-executor306/5229 is leaving the kernel with locks still held!
1 lock held by syz-executor306/5229:
 #0: ffff8880473a18b0 (&fi->i_gc_rwsem[WRITE]){+.+.}-{3:3}, at: f2fs_down_write fs/f2fs/f2fs.h:2196 [inline]
 #0: ffff8880473a18b0 (&fi->i_gc_rwsem[WRITE]){+.+.}-{3:3}, at: f2fs_commit_atomic_write+0x105/0x1510 fs/f2fs/segment.c:388


---
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@googlegroups.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:
#syz fix: exact-commit-title

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