linux-kernel - Re: [syzbot] [btrfs?] WARNING in __btrfs_check

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Message-ID: <20240826151039.GO25962@twin.jikos.cz>
Date: Mon, 26 Aug 2024 17:10:39 +0200
From: David Sterba <dsterba@...e.cz>
To: syzbot <syzbot+d7d1fc7e21835ca19219@...kaller.appspotmail.com>
Cc: clm@...com, dsterba@...e.com, josef@...icpanda.com,
	linux-btrfs@...r.kernel.org, linux-kernel@...r.kernel.org,
	syzkaller-bugs@...glegroups.com, boris@....io
Subject: Re: [syzbot] [btrfs?] WARNING in __btrfs_check_leaf

On Fri, Aug 23, 2024 at 05:08:25AM -0700, syzbot wrote:
> Hello,
> 
> syzbot found the following issue on:
> 
> HEAD commit:    872cf28b8df9 Merge tag 'platform-drivers-x86-v6.11-4' of g..
> git tree:       upstream
> console output: https://syzkaller.appspot.com/x/log.txt?x=154c5825980000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=4fc2afd52fd008bb
> dashboard link: https://syzkaller.appspot.com/bug?extid=d7d1fc7e21835ca19219
> compiler:       Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
> 
> Unfortunately, I don't have any reproducer for this issue yet.
> 
> Downloadable assets:
> disk image: https://storage.googleapis.com/syzbot-assets/c63409516c62/disk-872cf28b.raw.xz
> vmlinux: https://storage.googleapis.com/syzbot-assets/79b2b8c52d3a/vmlinux-872cf28b.xz
> kernel image: https://storage.googleapis.com/syzbot-assets/27cb9df9c339/bzImage-872cf28b.xz
> 
> IMPORTANT: if you fix the issue, please add the following tag to the commit:
> Reported-by: syzbot+d7d1fc7e21835ca19219@...kaller.appspotmail.com
> 
> ------------[ cut here ]------------
> WARNING: CPU: 0 PID: 6069 at fs/btrfs/tree-checker.c:1545 check_extent_item fs/btrfs/tree-checker.c:1545 [inline]

Thats'

	case BTRFS_EXTENT_OWNER_REF_KEY:
		WARN_ON(!btrfs_fs_incompat(fs_info, SIMPLE_QUOTA));
		break;

So the incompat bit is unset for some reason, or the tree item is intentionally
inserted. Either way this should be handled in a better way.