syzbot

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WARNING: CPU: 3 PID: 11 at lib/ref_tracker.c:39 spin_unlock_irqrestore include/linux/spinlock.h:405 [inline]
WARNING: CPU: 3 PID: 11 at lib/ref_tracker.c:39 ref_tracker_dir_exit.cold+0x137/0x1e3 lib/ref_tracker.c:38
Modules linked in:
CPU: 2 PID: 11 Comm: kworker/u16:1 Not tainted 6.2.0-rc5-syzkaller-00205-gc96618275234 #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.14.0-2 04/01/2014
Workqueue: netns cleanup_net
RIP: 0010:ref_tracker_dir_exit.cold+0x137/0x1e3 lib/ref_tracker.c:39
Code: 4c 89 ef e8 d9 bf fc f7 4c 8b 3c 24 4c 39 fd 49 8b 07 0f 85 b5 00 00 00 e8 64 84 af f7 48 8b 74 24 10 4c 89 e7 e8 e7 31 38 00 <0f> 0b e9 19 95 68 fa 4c 89 ff e8 a8 bf fc f7 e9 d4 fe ff ff e8 7e
RSP: 0018:ffffc900005efc00 EFLAGS: 00010246
RAX: 0000000000000000 RBX: dffffc0000000000 RCX: 0000000000000000
RDX: 0000000000000001 RSI: 0000000000000001 RDI: 0000000000000001
RBP: ffff888073864250 R08: 0000000000000001 R09: ffffffff9132fbdf
R10: 0000000000000001 R11: 0000000000000000 R12: ffff888073864200
R13: ffff888073864250 R14: ffff888073864250 R15: ffff888073864250
FS:  0000000000000000(0000) GS:ffff88802c900000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000002018b000 CR3: 00000000776ea000 CR4: 0000000000150ee0
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+0x8bb/0xb10 net/core/net_namespace.c:627
 process_one_work+0x9bf/0x1710 kernel/workqueue.c:2289
 worker_thread+0x669/0x1090 kernel/workqueue.c:2436
 kthread+0x2e8/0x3a0 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308
 </TASK>