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

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Message-ID: <00000000000082aa87061faa8cfb@google.com>
Date: Wed, 14 Aug 2024 13:27:02 -0700
From: syzbot <syzbot+733300ca0a9baca7e245@...kaller.appspotmail.com>
To: eadavis@...com, 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

Hello,

syzbot has tested the proposed patch but the reproducer is still triggering an issue:
WARNING: lock held when returning to user space in f2fs_ioc_start_atomic_write

F2FS-fs (loop0): Mounted with checkpoint version = 48b305e5
syz.0.15: 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-dirty #0 Not tainted
------------------------------------------------
syz.0.15/6178 is leaving the kernel with locks still held!
1 lock held by syz.0.15/6178:
 #0: ffff88807032a0e0 (&fi->i_gc_rwsem[READ]){+.+.}-{3:3}, at: f2fs_down_write fs/f2fs/f2fs.h:2196 [inline]
 #0: ffff88807032a0e0 (&fi->i_gc_rwsem[READ]){+.+.}-{3:3}, at: f2fs_ioc_start_atomic_write+0x2ed/0xac0 fs/f2fs/file.c:2163


Tested on:

commit:         9e686969 Add linux-next specific files for 20240812
git tree:       git://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git
console output: https://syzkaller.appspot.com/x/log.txt?x=16367cfd980000
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
patch:          https://syzkaller.appspot.com/x/patch.diff?x=1510e1f5980000