linux-kernel - Re: [syzbot] [ext4?] KASAN: use-after-free Read in ext4_ext_insert

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Message-ID: <6834804f.a70a0220.1765ec.016b.GAE@google.com>
Date: Mon, 26 May 2025 07:53:03 -0700
From: syzbot <syzbot+9db318d6167044609878@...kaller.appspotmail.com>
To: adilger.kernel@...ger.ca, akpm@...ux-foundation.org, 
	dave.hansen@...ux.intel.com, linux-ext4@...r.kernel.org, 
	linux-kernel@...r.kernel.org, syzkaller-bugs@...glegroups.com, tytso@....edu
Subject: Re: [syzbot] [ext4?] KASAN: use-after-free Read in ext4_ext_insert_extent

syzbot has bisected this issue to:

commit 665575cff098b696995ddaddf4646a4099941f5e
Author: Dave Hansen <dave.hansen@...ux.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@...kaller.appspotmail.com
Fixes: 665575cff098 ("filemap: move prefaulting out of hot write path")

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