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

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Message-ID: <6870a4a4.a00a0220.26a83e.003c.GAE@google.com>
Date: Thu, 10 Jul 2025 22:44:04 -0700
From: syzbot <syzbot+80011ad33eec39e6ce42@...kaller.appspotmail.com>
To: hdanton@...a.com, linux-kernel@...r.kernel.org, 
	syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [mm?] WARNING: lock held when returning to user space in lock_next_vma

Hello,

syzbot has tested the proposed patch but the reproducer is still triggering an issue:
WARNING: lock held when returning to user space in lock_next_vma

================================================
WARNING: lock held when returning to user space!
6.16.0-rc5-next-20250710-syzkaller #0 Not tainted
------------------------------------------------
syz.0.21/6653 is leaving the kernel with locks still held!
2 locks held by syz.0.21/6653:
 #0: ffff8880722e3808 (vm_lock){++++}-{0:0}, at: lock_next_vma+0x146/0xdc0 mm/mmap_lock.c:220
 #1: ffff8880722e3308 (vm_lock){++++}-{0:0}, at: lock_next_vma+0x146/0xdc0 mm/mmap_lock.c:220


Tested on:

commit:         b551c4e2 Add linux-next specific files for 20250710
git tree:       linux-next
console output: https://syzkaller.appspot.com/x/log.txt?x=15948d82580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=90b2e63e925474ab
dashboard link: https://syzkaller.appspot.com/bug?extid=80011ad33eec39e6ce42
compiler:       Debian clang version 20.1.7 (++20250616065708+6146a88f6049-1~exp1~20250616065826.132), Debian LLD 20.1.7

Note: no patches were applied.