linux-kernel - Re: [syzbot] [bcachefs?] UBSAN: array-index-out-of-bounds in bch2_accounting

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Message-ID: <6890ed2c.050a0220.1fc43d.0010.GAE@google.com>
Date: Mon, 04 Aug 2025 10:26:04 -0700
From: syzbot <syzbot+cd063f869beedf5b9cd7@...kaller.appspotmail.com>
To: bfoster@...hat.com, elver@...gle.com, justinstitt@...gle.com, 
	keescook@...omium.org, kent.overstreet@...ux.dev, 
	linux-bcachefs@...r.kernel.org, linux-kernel@...r.kernel.org, 
	mmpgouride@...il.com, syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [bcachefs?] UBSAN: array-index-out-of-bounds in bch2_accounting_validate

syzbot has bisected this issue to:

commit 557f8c582a9ba8abe6aa0fd734b6f342af106b26
Author: Kees Cook <keescook@...omium.org>
Date:   Thu Jan 18 23:06:05 2024 +0000

    ubsan: Reintroduce signed overflow sanitizer

bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=161982f0580000
start commit:   352af6a011d5 Merge tag 'rust-6.17' of git://git.kernel.org..
git tree:       upstream
final oops:     https://syzkaller.appspot.com/x/report.txt?x=151982f0580000
console output: https://syzkaller.appspot.com/x/log.txt?x=111982f0580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=cae1291240e8962a
dashboard link: https://syzkaller.appspot.com/bug?extid=cd063f869beedf5b9cd7
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=14dcc6a2580000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=133e02f0580000

Reported-by: syzbot+cd063f869beedf5b9cd7@...kaller.appspotmail.com
Fixes: 557f8c582a9b ("ubsan: Reintroduce signed overflow sanitizer")

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