linux-kernel - Re: [syzbot] [mm?] BUG: Bad page map (8)

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Message-ID: <66f9ea7a.050a0220.aab67.0023.GAE@google.com>
Date: Sun, 29 Sep 2024 17:02:02 -0700
From: syzbot <syzbot+ec4b7d82bb051330f15a@...kaller.appspotmail.com>
To: Liam.Howlett@...cle.com, Liam.Howlett@...cle.com, 
	akpm@...ux-foundation.org, david@...hat.com, hdanton@...a.com, 
	hughd@...gle.com, liam.howlett@...cle.com, linux-kernel@...r.kernel.org, 
	linux-mm@...ck.org, lorenzo.stoakes@...cle.com, 
	syzkaller-bugs@...glegroups.com, vbabka@...e.cz, vivek.kasireddy@...el.com, 
	willy@...radead.org
Subject: Re: [syzbot] [mm?] BUG: Bad page map (8)

syzbot has bisected this issue to:

commit f8d112a4e657c65c888e6b8a8435ef61a66e4ab8
Author: Liam R. Howlett <Liam.Howlett@...cle.com>
Date:   Fri Aug 30 04:00:54 2024 +0000

    mm/mmap: avoid zeroing vma tree in mmap_region()

bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=13a44127980000
start commit:   3efc57369a0c Merge tag 'for-linus' of git://git.kernel.org..
git tree:       upstream
final oops:     https://syzkaller.appspot.com/x/report.txt?x=10644127980000
console output: https://syzkaller.appspot.com/x/log.txt?x=17a44127980000
kernel config:  https://syzkaller.appspot.com/x/.config?x=a4fcb065287cdb84
dashboard link: https://syzkaller.appspot.com/bug?extid=ec4b7d82bb051330f15a
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=113acd9f980000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=14cc0127980000

Reported-by: syzbot+ec4b7d82bb051330f15a@...kaller.appspotmail.com
Fixes: f8d112a4e657 ("mm/mmap: avoid zeroing vma tree in mmap_region()")

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