linux-kernel - [syzbot] [f2fs?] WARNING: lock held when returning to user space in f2fs_write_single_data

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Message-ID: <0000000000000534da05faa4d3d4@google.com>
Date:   Mon, 01 May 2023 10:05:05 -0700
From:   syzbot <syzbot+eb6201248f684e99b9f8@...kaller.appspotmail.com>
To:     chao@...nel.org, jaegeuk@...nel.org,
        linux-f2fs-devel@...ts.sourceforge.net,
        linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
        syzkaller-bugs@...glegroups.com
Subject: [syzbot] [f2fs?] WARNING: lock held when returning to user space in f2fs_write_single_data_page

Hello,

syzbot found the following issue on:

HEAD commit:    58390c8ce1bd Merge tag 'iommu-updates-v6.4' of git://git.k..
git tree:       upstream
console+strace: https://syzkaller.appspot.com/x/log.txt?x=136e6ef8280000
kernel config:  https://syzkaller.appspot.com/x/.config?x=5eadbf0d3c2ece89
dashboard link: https://syzkaller.appspot.com/bug?extid=eb6201248f684e99b9f8
compiler:       Debian clang version 15.0.7, GNU ld (GNU Binutils for Debian) 2.35.2
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=16bbb03c280000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=140d36f8280000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/60130779f509/disk-58390c8c.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/d7f0cdd29b71/vmlinux-58390c8c.xz
kernel image: https://storage.googleapis.com/syzbot-assets/de415ad52ae4/bzImage-58390c8c.xz
mounted in repro: https://storage.googleapis.com/syzbot-assets/dc89d01cd6e9/mount_0.gz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+eb6201248f684e99b9f8@...kaller.appspotmail.com

syz-executor768: attempt to access beyond end of device
loop0: rw=2049, sector=77824, nr_sectors = 2048 limit=63271
syz-executor768: attempt to access beyond end of device
loop0: rw=2049, sector=79872, nr_sectors = 2048 limit=63271
================================================
WARNING: lock held when returning to user space!
6.3.0-syzkaller-12049-g58390c8ce1bd #0 Not tainted
------------------------------------------------
syz-executor768/4998 is leaving the kernel with locks still held!
1 lock held by syz-executor768/4998:
 #0: ffff88807e800448 (&sbi->node_write){++++}-{3:3}, at: f2fs_down_read fs/f2fs/f2fs.h:2087 [inline]
 #0: ffff88807e800448 (&sbi->node_write){++++}-{3:3}, at: f2fs_write_single_data_page+0xa10/0x1d50 fs/f2fs/data.c:2842


---
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:
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If the bug is already fixed, let syzbot know by replying with:
#syz fix: exact-commit-title

If you want syzbot to run the reproducer, reply with:
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#syz undup