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Date:   Wed, 3 May 2023 23:28:57 +0800
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To:     syzbot <syzbot+eb6201248f684e99b9f8@syzkaller.appspotmail.com>,
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From:   Chao Yu <chao@kernel.org>
Subject: Re: [syzbot] [f2fs?] WARNING: lock held when returning to user space
 in f2fs_write_single_data_page
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On 2023/5/2 1:05, syzbot wrote:
> 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@syzkaller.appspotmail.com

#syz test https://git.kernel.org/pub/scm/linux/kernel/git/chao/linux.git dev-test

> 
> 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@googlegroups.com.
> 
> syzbot will keep track of this issue. See:
> https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
> 
> 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:
> #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 change bug's subsystems, reply with:
> #syz set subsystems: new-subsystem
> (See the list of subsystem names on the web dashboard)
> 
> If the bug is a duplicate of another bug, reply with:
> #syz dup: exact-subject-of-another-report
> 
> If you want to undo deduplication, reply with:
> #syz undup