linux-kernel - Re: [syzbot] [btrfs?] kernel BUG in btrfs_exclop

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Date:   Tue, 6 Jun 2023 16:07:49 +0200
From:   David Sterba <dsterba@...e.cz>
To:     syzbot <syzbot+5e466383663438b99b44@...kaller.appspotmail.com>
Cc:     chris@...isdown.name, clm@...com, dsterba@...e.com,
        josef@...icpanda.com, linux-btrfs@...r.kernel.org,
        linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
        syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [btrfs?] kernel BUG in btrfs_exclop_balance (2)

On Fri, May 05, 2023 at 06:43:55PM -0700, syzbot wrote:
> syzbot has found a reproducer for the following issue on:
> 
> HEAD commit:    7163a2111f6c Merge tag 'acpi-6.4-rc1-3' of git://git.kerne..
> git tree:       upstream
> console output: https://syzkaller.appspot.com/x/log.txt?x=175bb84c280000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=73a06f6ef2d5b492
> dashboard link: https://syzkaller.appspot.com/bug?extid=5e466383663438b99b44
> 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=12048338280000
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=11ff7314280000
> 
> Downloadable assets:
> disk image: https://storage.googleapis.com/syzbot-assets/01051811f2fe/disk-7163a211.raw.xz
> vmlinux: https://storage.googleapis.com/syzbot-assets/a26c68e4c8a6/vmlinux-7163a211.xz
> kernel image: https://storage.googleapis.com/syzbot-assets/17380fb8dad4/bzImage-7163a211.xz
> mounted in repro: https://storage.googleapis.com/syzbot-assets/b30a249e8609/mount_0.gz
> 
> IMPORTANT: if you fix the issue, please add the following tag to the commit:
> Reported-by: syzbot+5e466383663438b99b44@...kaller.appspotmail.com

#syz fix: btrfs: fix assertion of exclop condition when starting balance

> assertion failed: fs_info->exclusive_operation == BTRFS_EXCLOP_BALANCE_PAUSED, in fs/btrfs/ioctl.c:463

Likely the same problem as https://syzkaller.appspot.com/bug?extid=afdee14f9fd3d20448e7