linux-kernel - Re: [syzbot] [mm?] WARNING in follow_page

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Message-ID: <68933a9d.a70a0220.7865.0004.GAE@google.com>
Date: Wed, 06 Aug 2025 04:21:01 -0700
From: syzbot <syzbot+57bcc752f0df8bb1365c@...kaller.appspotmail.com>
To: akpm@...ux-foundation.org, david@...hat.com, dev.jain@....com, 
	jgg@...pe.ca, jhubbard@...dia.com, linux-kernel@...r.kernel.org, 
	linux-mm@...ck.org, lorenzo.stoakes@...cle.com, peterx@...hat.com, 
	syzkaller-bugs@...glegroups.com, ziy@...dia.com
Subject: Re: [syzbot] [mm?] WARNING in follow_page_pte

syzbot has bisected this issue to:

commit cac1db8c3aad97d6ffb56ced8868d6cbbbd2bfbe
Author: Dev Jain <dev.jain@....com>
Date:   Fri Jul 18 09:02:43 2025 +0000

    mm: optimize mprotect() by PTE batching

bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=13c746a2580000
start commit:   7e161a991ea7 Merge tag 'i2c-for-6.17-rc1-part2' of git://g..
git tree:       upstream
final oops:     https://syzkaller.appspot.com/x/report.txt?x=102746a2580000
console output: https://syzkaller.appspot.com/x/log.txt?x=17c746a2580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=75e522434dc68cb9
dashboard link: https://syzkaller.appspot.com/bug?extid=57bcc752f0df8bb1365c
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=126e85bc580000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=161a22f0580000

Reported-by: syzbot+57bcc752f0df8bb1365c@...kaller.appspotmail.com
Fixes: cac1db8c3aad ("mm: optimize mprotect() by PTE batching")

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