linux-kernel - Re: [syzbot] [mm?] WARNING: lock held when returning to user space in lock_next

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Message-ID: <686dcbbb.050a0220.1ffab7.002a.GAE@google.com>
Date: Tue, 08 Jul 2025 18:54:03 -0700
From: syzbot <syzbot+80011ad33eec39e6ce42@...kaller.appspotmail.com>
To: Liam.Howlett@...cle.com, akpm@...ux-foundation.org, andrii@...nel.org, 
	anna.luese@...ien.de, liam.howlett@...cle.com, linux-kernel@...r.kernel.org, 
	linux-mm@...ck.org, lorenzo.stoakes@...cle.com, shakeel.butt@...ux.dev, 
	surenb@...gle.com, syzkaller-bugs@...glegroups.com, vbabka@...e.cz
Subject: Re: [syzbot] [mm?] WARNING: lock held when returning to user space in lock_next_vma

syzbot has bisected this issue to:

commit 6772c457a86536f3496bf5b3716f34a5ac125783
Author: Suren Baghdasaryan <surenb@...gle.com>
Date:   Tue Jun 24 19:33:59 2025 +0000

    fs/proc/task_mmu:: execute PROCMAP_QUERY ioctl under per-vma locks

bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=158fca8c580000
start commit:   26ffb3d6f02c Add linux-next specific files for 20250704
git tree:       linux-next
final oops:     https://syzkaller.appspot.com/x/report.txt?x=178fca8c580000
console output: https://syzkaller.appspot.com/x/log.txt?x=138fca8c580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=1e4f88512ae53408
dashboard link: https://syzkaller.appspot.com/bug?extid=80011ad33eec39e6ce42
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=1124abd4580000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=1099df70580000

Reported-by: syzbot+80011ad33eec39e6ce42@...kaller.appspotmail.com
Fixes: 6772c457a865 ("fs/proc/task_mmu:: execute PROCMAP_QUERY ioctl under per-vma locks")

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