____sys_sendmsg+0x5f7/0x8a0 net/socket.c:2476
 ___sys_sendmsg+0xdb/0x160 net/socket.c:2530
 __sys_sendmsg+0xc7/0x160 net/socket.c:2559
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
------------[ cut here ]------------
WARNING: CPU: 0 PID: 11 at lib/ref_tracker.c:39 spin_unlock_irqrestore include/linux/spinlock.h:405 [inline]
WARNING: CPU: 0 PID: 11 at lib/ref_tracker.c:39 ref_tracker_dir_exit.cold+0x163/0x1b4 lib/ref_tracker.c:38
Modules linked in:

CPU: 0 PID: 11 Comm: kworker/u4:1 Not tainted 6.1.0-rc7-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022
Workqueue: netns cleanup_net

RIP: 0010:ref_tracker_dir_exit.cold+0x163/0x1b4 lib/ref_tracker.c:39
Code: c1 e8 03 80 3c 18 00 74 08 4c 89 e7 e8 0d c4 d3 f8 4d 39 e6 49 8b 04 24 4d 89 e7 75 3f 48 8b 74 24 08 48 89 ef e8 24 85 35 00 <0f> 0b e9 7d 5c f1 fa 4c 89 ff e8 e5 c3 d3 f8 e9 a3 fe ff ff e8 bb
RSP: 0018:ffffc90000107c08 EFLAGS: 00010246

RAX: 0000000000000000 RBX: dffffc0000000000 RCX: 0000000000000000
RDX: 0000000000000001 RSI: ffffffff896b7be0 RDI: 0000000000000001
RBP: ffff8880737381c0 R08: 0000000000000001 R09: ffffffff901d9b4f
R10: 0000000000000001 R11: 0000000000084080 R12: ffff888073738210
R13: ffff888073738210 R14: ffff888073738210 R15: ffff888073738210
FS:  0000000000000000(0000) GS:ffff8880b9a00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055eef8850950 CR3: 00000000782e2000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 net_free net/core/net_namespace.c:442 [inline]
 net_free net/core/net_namespace.c:436 [inline]
 cleanup_net+0x6fd/0x990 net/core/net_namespace.c:627
 process_one_work+0x8ba/0x14c0 kernel/workqueue.c:2289
 worker_thread+0x59c/0xec0 kernel/workqueue.c:2436
 kthread+0x298/0x340 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306
 </TASK>