linux-kernel - [syzbot] [fs?] WARNING: lock held when returning to user space in query_matching

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Message-ID: <68753a07.050a0220.33d347.0007.GAE@google.com>
Date: Mon, 14 Jul 2025 10:10:31 -0700
From: syzbot <syzbot+add57955be940be754a1@...kaller.appspotmail.com>
To: linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org, 
	syzkaller-bugs@...glegroups.com
Subject: [syzbot] [fs?] WARNING: lock held when returning to user space in query_matching_vma

Hello,

syzbot found the following issue on:

HEAD commit:    a62b7a37e6fc Add linux-next specific files for 20250711
git tree:       linux-next
console output: https://syzkaller.appspot.com/x/log.txt?x=11e2ce8c580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=7d42120e19faaef
dashboard link: https://syzkaller.appspot.com/bug?extid=add57955be940be754a1
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=132750f0580000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=167507d4580000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/691b5f8ab5b1/disk-a62b7a37.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/47d1a209784d/vmlinux-a62b7a37.xz
kernel image: https://storage.googleapis.com/syzbot-assets/eb70d73c9e55/bzImage-a62b7a37.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+add57955be940be754a1@...kaller.appspotmail.com

================================================
WARNING: lock held when returning to user space!
6.16.0-rc5-next-20250711-syzkaller #0 Not tainted
------------------------------------------------
syz.0.22/6099 is leaving the kernel with locks still held!
1 lock held by syz.0.22/6099:
 #0: ffff888069d41588 (vm_lock){++++}-{0:0}, at: get_next_vma fs/proc/task_mmu.c:182 [inline]
 #0: ffff888069d41588 (vm_lock){++++}-{0:0}, at: query_vma_find_by_addr fs/proc/task_mmu.c:512 [inline]
 #0: ffff888069d41588 (vm_lock){++++}-{0:0}, at: query_matching_vma+0x319/0x5c0 fs/proc/task_mmu.c:544


---
This report is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzkaller@...glegroups.com.

syzbot will keep track of this issue. See:
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If the report is already addressed, let syzbot know by replying with:
#syz fix: exact-commit-title

If you want syzbot to run the reproducer, reply with:
#syz test: git://repo/address.git branch-or-commit-hash
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#syz dup: exact-subject-of-another-report

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#syz undup