linux-kernel - Re: [syzbot] [io-uring?] KASAN: null-ptr-deref Read in io_sqe_buffer

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Message-ID: <68be5bca.050a0220.192772.0831.GAE@google.com>
Date: Sun, 07 Sep 2025 21:30:02 -0700
From: syzbot <syzbot+1ab243d3eebb2aabf4a4@...kaller.appspotmail.com>
To: akpm@...ux-foundation.org, axboe@...nel.dk, david@...hat.com, 
	io-uring@...r.kernel.org, jgg@...pe.ca, jhubbard@...dia.com, 
	linux-kernel@...r.kernel.org, linux-mm@...ck.org, peterx@...hat.com, 
	syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [io-uring?] KASAN: null-ptr-deref Read in io_sqe_buffer_register

syzbot has bisected this issue to:

commit da6b34293ff8dbb78f8b9278c9a492925bbf1f87
Author: David Hildenbrand <david@...hat.com>
Date:   Mon Sep 1 15:03:40 2025 +0000

    mm/gup: remove record_subpages()

bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=1240f962580000
start commit:   4ac65880ebca Add linux-next specific files for 20250904
git tree:       linux-next
final oops:     https://syzkaller.appspot.com/x/report.txt?x=1140f962580000
console output: https://syzkaller.appspot.com/x/log.txt?x=1640f962580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=fbc16d9faf3a88a4
dashboard link: https://syzkaller.appspot.com/bug?extid=1ab243d3eebb2aabf4a4
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=12a0e312580000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=101e3e62580000

Reported-by: syzbot+1ab243d3eebb2aabf4a4@...kaller.appspotmail.com
Fixes: da6b34293ff8 ("mm/gup: remove record_subpages()")

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