[syzbot] [virt?] INFO: trying to register non-static key in stats_request (2)

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit: 8d3ae59288f1 Linux 7.2
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=10240679580000
kernel config: https://syzkaller.appspot.com/x/.config?x=4c9eb8e593cf8c5c
dashboard link: https://syzkaller.appspot.com/bug?extid=13df72e0dc4be5c62215
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/cd49b631c498/disk-8d3ae592.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/05d3ad83c130/vmlinux-8d3ae592.xz
kernel image: https://storage.googleapis.com/syzbot-assets/3a2efa4a6769/bzImage-8d3ae592.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+13df72...@syzkaller.appspotmail.com

INFO: trying to register non-static key.
The code is fine but needs lockdep annotation, or maybe
you didn't initialize this object before use?
turning off the locking correctness validator.
CPU: 0 UID: 0 PID: 20235 Comm: irq/10-virtio2 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
Call Trace:
<TASK>
dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120
assign_lock_key+0x133/0x150 kernel/locking/lockdep.c:984
register_lock_class+0xcc/0x2e0 kernel/locking/lockdep.c:1299
__lock_acquire+0xab/0x2ce0 kernel/locking/lockdep.c:5112
lock_acquire+0x106/0x350 kernel/locking/lockdep.c:5868
rt_spin_lock+0x83/0x400 kernel/locking/spinlock_rt.c:56
spin_lock include/linux/spinlock_rt.h:45 [inline]
start_wakeup_event drivers/virtio/virtio_balloon.c:150 [inline]
stats_request+0xa5/0x1f0 drivers/virtio/virtio_balloon.c:435
vring_interrupt+0x408/0x680 drivers/virtio/virtio_ring.c:3297
vp_vring_interrupt drivers/virtio/virtio_pci_common.c:92 [inline]
vp_interrupt+0x183/0x200 drivers/virtio/virtio_pci_common.c:123
irq_thread_fn kernel/irq/manage.c:1143 [inline]
irq_forced_thread_fn+0x98/0x120 kernel/irq/manage.c:1165
irq_thread+0x455/0x690 kernel/irq/manage.c:1271
kthread+0x388/0x470 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>


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