linux-kernel - Re: [syzbot] [bcachefs?] kernel BUG in bch2_btree_path_level

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Message-ID: <68bb1228.050a0220.192772.0194.GAE@google.com>
Date: Fri, 05 Sep 2025 09:39:04 -0700
From: syzbot <syzbot+55c84106264e92ea9ada@...kaller.appspotmail.com>
To: kent.overstreet@...ux.dev, linux-bcachefs@...r.kernel.org, 
	linux-kernel@...r.kernel.org, syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [bcachefs?] kernel BUG in bch2_btree_path_level_init (4)

syzbot has bisected this issue to:

commit f11ca2ab18e369a662c2f60d53b8bea46c54e312
Author: Kent Overstreet <kent.overstreet@...ux.dev>
Date:   Thu Nov 28 03:29:54 2024 +0000

    bcachefs: Guard against backpointers to unknown btrees

bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=1663c962580000
start commit:   d69eb204c255 Merge tag 'net-6.17-rc5' of git://git.kernel...
git tree:       upstream
final oops:     https://syzkaller.appspot.com/x/report.txt?x=1563c962580000
console output: https://syzkaller.appspot.com/x/log.txt?x=1163c962580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=bd9738e00c1bbfb4
dashboard link: https://syzkaller.appspot.com/bug?extid=55c84106264e92ea9ada
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=1788c962580000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=12b0887c580000

Reported-by: syzbot+55c84106264e92ea9ada@...kaller.appspotmail.com
Fixes: f11ca2ab18e3 ("bcachefs: Guard against backpointers to unknown btrees")

For information about bisection process see: https://goo.gl/tpsmEJ#bisection