linux-kernel - Re: [syzbot] [mm?] general protection fault in mremap

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Message-ID: <6824a16b.a70a0220.3e9d8.0015.GAE@google.com>
Date: Wed, 14 May 2025 06:58:03 -0700
From: syzbot <syzbot+5250c4727db03e3436cc@...kaller.appspotmail.com>
To: Liam.Howlett@...cle.com, akpm@...ux-foundation.org, eadavis@...com, 
	jannh@...gle.com, liam.howlett@...cle.com, linux-kernel@...r.kernel.org, 
	linux-mm@...ck.org, lorenzo.stoakes@...cle.com, nogikh@...gle.com, 
	pfalcato@...e.de, syzkaller-bugs@...glegroups.com, syzkaller@...glegroups.com, 
	vbabka@...e.cz
Subject: Re: [syzbot] [mm?] general protection fault in mremap

syzbot suspects this issue was fixed by commit:

commit 36eed5400805b294f1df39b0e3ebc5b7971b3c16
Author: Lorenzo Stoakes <lorenzo.stoakes@...cle.com>
Date:   Sun Mar 30 16:20:48 2025 +0000

    mm/mremap: do not set vrm->vma NULL immediately prior to checking it

bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=118356f4580000
start commit:   a2cc6ff5ec8f Merge tag 'firewire-updates-6.15' of git://gi..
git tree:       upstream
kernel config:  https://syzkaller.appspot.com/x/.config?x=adffebefc9feb9d6
dashboard link: https://syzkaller.appspot.com/bug?extid=5250c4727db03e3436cc
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=1693d404580000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=178ac94c580000

If the result looks correct, please mark the issue as fixed by replying with:

#syz fix: mm/mremap: do not set vrm->vma NULL immediately prior to checking it

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