linux-kernel - Re: [syzbot] [bcachefs?] KASAN: use-after-free Read in bch2_prt

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Message-ID: <68bb6a0a.050a0220.192772.01a0.GAE@google.com>
Date: Fri, 05 Sep 2025 15:54:02 -0700
From: syzbot <syzbot+7f176adb30b21606c5fc@...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?] KASAN: use-after-free Read in bch2_prt_printf

syzbot has bisected this issue to:

commit c21f41f6905be4fc5059a10a5bba94105ba87269
Author: Kent Overstreet <kent.overstreet@...ux.dev>
Date:   Thu Apr 24 21:55:20 2025 +0000

    bcachefs: bch2_dirent_to_text() shows casefolded dirents

bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=12c65312580000
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=11c65312580000
console output: https://syzkaller.appspot.com/x/log.txt?x=16c65312580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=bd9738e00c1bbfb4
dashboard link: https://syzkaller.appspot.com/bug?extid=7f176adb30b21606c5fc
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=178ec962580000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=10097162580000

Reported-by: syzbot+7f176adb30b21606c5fc@...kaller.appspotmail.com
Fixes: c21f41f6905b ("bcachefs: bch2_dirent_to_text() shows casefolded dirents")

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