[syzbot] [mm?] WARNING: lock held when returning to user space in lock_next_vma

[syzbot <syzbot+80011ad33eec39e6ce42@syzkaller.appspotmail.com>]

Hello,

syzbot found the following issue on:

HEAD commit:    26ffb3d6f02c Add linux-next specific files for 20250704
git tree:       linux-next
console output: https://syzkaller.appspot.com/x/log.txt?x=1719df70580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=1e4f88512ae53408
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
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=1124abd4580000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=1099df70580000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/fd5569903143/disk-26ffb3d6.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/1b0c9505c543/vmlinux-26ffb3d6.xz
kernel image: https://storage.googleapis.com/syzbot-assets/9d864c72bed1/bzImage-26ffb3d6.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+80011ad33eec39e6ce42@syzkaller.appspotmail.com

================================================
WARNING: lock held when returning to user space!
6.16.0-rc4-next-20250704-syzkaller #0 Not tainted
------------------------------------------------
syz.0.22/6068 is leaving the kernel with locks still held!
1 lock held by syz.0.22/6068:
 #0: ffff8880792a3588 (vm_lock){++++}-{0:0}, at: lock_next_vma+0x146/0xdc0 mm/mmap_lock.c:220


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