[syzbot] [nvme?] WARNING: bad unlock balance in nvme_update_ns_info

[syzbot] [nvme?] WARNING: bad unlock balance in nvme_update_ns_info

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit:    704340f1cd0d Merge tag 'x86_urgent_for_7.3-rc4' of git://g..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=126bbdf9580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=b454dc6b1b7acd30
dashboard link: https://syzkaller.appspot.com/bug?extid=64bc2169c92ee55ad31f
compiler:       Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8

Unfortunately, I don't have any reproducer for this issue yet.

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/068a35f4a268/disk-704340f1.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/5bb5e44895e8/vmlinux-704340f1.xz
kernel image: https://storage.googleapis.com/syzbot-assets/8cb2bd26a861/bzImage-704340f1.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+64bc2169c92ee55ad31f@syzkaller.appspotmail.com

=====================================
WARNING: bad unlock balance detected!
syzkaller #0 Tainted: G             L     
-------------------------------------
kworker/u8:28/9220 is trying to release lock (&q->q_usage_counter(io)) at:
[<ffffffff85e833c7>] blk_mq_unfreeze_queue include/linux/blk-mq.h:962 [inline]
[<ffffffff85e833c7>] nvme_update_ns_info+0xa07/0x1200 drivers/nvme/host/core.c:2623
but there are no more locks to release!

other info that might help us debug this:
locks held by kworker/u8:28/9220: 2, last CPU#1:
 #0: ffff88801ae8d138 ((wq_completion)async){+.+.}-{0:0}, at: rcu_lock_acquire include/linux/rcupdate.h:309 [inline]
 #0: ffff88801ae8d138 ((wq_completion)async){+.+.}-{0:0}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
 #0: ffff88801ae8d138 ((wq_completion)async){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3361 [inline]
 #0: ffff88801ae8d138 ((wq_completion)async){+.+.}-{0:0}, at: process_scheduled_works+0x97a/0x1630 kernel/workqueue.c:3479
 #1: ffffc9000460fc40 ((work_completion)(&entry->work)){+.+.}-{0:0}, at: rcu_lock_acquire include/linux/rcupdate.h:309 [inline]
 #1: ffffc9000460fc40 ((work_completion)(&entry->work)){+.+.}-{0:0}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
 #1: ffffc9000460fc40 ((work_completion)(&entry->work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3361 [inline]
 #1: ffffc9000460fc40 ((work_completion)(&entry->work)){+.+.}-{0:0}, at: process_scheduled_works+0x97a/0x1630 kernel/workqueue.c:3479

stack backtrace:
CPU: 1 UID: 0 PID: 9220 Comm: kworker/u8:28 Tainted: G             L      syzkaller #0 PREEMPT_{RT,(full)} 
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
Workqueue: async async_run_entry_fn
Call Trace:
 <TASK>
 dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120
 print_unlock_imbalance_bug+0xdc/0xf0 kernel/locking/lockdep.c:5349
 __lock_release kernel/locking/lockdep.c:5590 [inline]
 lock_release+0x252/0x3c0 kernel/locking/lockdep.c:5964
 blk_mq_unfreeze_queue include/linux/blk-mq.h:962 [inline]
 nvme_update_ns_info+0xa07/0x1200 drivers/nvme/host/core.c:2623
 nvme_alloc_ns drivers/nvme/host/core.c:4293 [inline]
 nvme_scan_ns+0x34c1/0x46c0 drivers/nvme/host/core.c:4483
 async_run_entry_fn+0x9d/0x430 kernel/async.c:129
 process_one_work kernel/workqueue.c:3396 [inline]
 process_scheduled_works+0xc3d/0x1630 kernel/workqueue.c:3479
 worker_thread+0xa47/0xfb0 kernel/workqueue.c:3560
 kthread+0x38b/0x470 kernel/kthread.c:436
 ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>


---
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@googlegroups.com.

syzbot will keep track of this issue. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.

If the report is already addressed, let syzbot know by replying with:
#syz fix: exact-commit-title

If you want to overwrite report's subsystems, reply with:
#syz set subsystems: new-subsystem
(See the list of subsystem names on the web dashboard)

If the report is a duplicate of another one, reply with:
#syz dup: exact-subject-of-another-report

If you want to undo deduplication, reply with:
#syz undup