Re: [syzbot] [ext4?] KASAN: use-after-free Read in ext4_ext_insert_extent

syzbot
2025-05-26T14:53:03Z

syzbot has bisected this issue to:

commit 665575cff098b696995ddaddf4646a4099941f5e
Author: Dave Hansen <dave.hansen@linux.intel.com>
Date: Fri Feb 28 20:37:22 2025 +0000

filemap: move prefaulting out of hot write path

bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=14435170580000
start commit: d0c22de9995b Merge tag 'input-for-v6.15-rc7' of git://git...
git tree: upstream
final oops: https://syzkaller.appspot.com/x/report.txt?x=16435170580000
console output: https://syzkaller.appspot.com/x/log.txt?x=12435170580000
kernel config: https://syzkaller.appspot.com/x/.config?x=a1de0d8596cea805
dashboard link: https://syzkaller.appspot.com/bug?extid=9db318d6167044609878
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=16931170580000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=14683ad4580000

Reported-by: syzbot+9db318d6167044609878@syzkaller.appspotmail.com
Fixes: 665575cff098 ("filemap: move prefaulting out of hot write path")

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