Re: [syzbot] [bcachefs?] KASAN: use-after-free Read in bch2_prt_printf

syzbot
2025-09-05T22:54:03Z

syzbot has bisected this issue to:

commit c21f41f6905be4fc5059a10a5bba94105ba87269
Author: Kent Overstreet <kent.overstreet@linux.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@syzkaller.appspotmail.com
Fixes: c21f41f6905b ("bcachefs: bch2_dirent_to_text() shows casefolded dirents")

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