leaked reference.
 __netns_tracker_alloc include/net/net_namespace.h:331 [inline]
 sk_alloc+0x717/0x7f0 net/core/sock.c:2108
 inet_create net/ipv4/af_inet.c:318 [inline]
 inet_create+0x399/0xfa0 net/ipv4/af_inet.c:244
 __sock_create+0x380/0x850 net/socket.c:1545
 __smc_create net/smc/af_smc.c:3267 [inline]
 smc_create+0x1fc/0x2d0 net/smc/af_smc.c:3284
 __sock_create+0x380/0x850 net/socket.c:1545
 sock_create net/socket.c:1596 [inline]
 __sys_socket_create net/socket.c:1633 [inline]
 __sys_socket_create net/socket.c:1618 [inline]
 __sys_socket+0x133/0x250 net/socket.c:1661
 __do_sys_socket net/socket.c:1674 [inline]
 __se_sys_socket net/socket.c:1672 [inline]
 __x64_sys_socket+0x73/0xb0 net/socket.c:1672
 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: 1 PID: 3684 at lib/ref_tracker.c:39 spin_unlock_irqrestore include/linux/spinlock.h:405 [inline]
WARNING: CPU: 1 PID: 3684 at lib/ref_tracker.c:39 ref_tracker_dir_exit+0x3a2/0x600 lib/ref_tracker.c:38
Modules linked in:
CPU: 1 PID: 3684 Comm: kworker/u4:6 Not tainted 6.3.0-rc2-syzkaller-00006-gfc89d7fb499b #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/02/2023
Workqueue: netns cleanup_net
RIP: 0010:ref_tracker_dir_exit+0x3a2/0x600 lib/ref_tracker.c:39
Code: 0f 84 c3 fe ff ff e8 bd 59 3d fd 44 89 ff e8 c5 f9 ff ff e9 b1 fe ff ff e8 ab 59 3d fd 48 8b 74 24 10 4c 89 ef e8 be 7a cb 05 <0f> 0b e8 97 59 3d fd 49 8d 6d 44 be 04 00 00 00 48 89 ef e8 26 a6
RSP: 0018:ffffc9000e827c00 EFLAGS: 00010246
RAX: 0000000000000000 RBX: dffffc0000000000 RCX: 0000000000000000
RDX: 0000000000000001 RSI: 0000000000000001 RDI: 0000000000000001
RBP: ffff888031f90210 R08: 0000000000000001 R09: ffffffff914d6c9f
R10: 0000000000000001 R11: 0000000000000000 R12: ffff888031f90210
R13: ffff888031f901c0 R14: ffff888031f90210 R15: ffff88804c615908
FS:  0000000000000000(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000562b1471e950 CR3: 0000000026a1b000 CR4: 0000000000350ee0
Call Trace:
 <TASK>
 net_free net/core/net_namespace.c:447 [inline]
 net_free net/core/net_namespace.c:441 [inline]
 cleanup_net+0x8bb/0xb10 net/core/net_namespace.c:634
 process_one_work+0x991/0x1710 kernel/workqueue.c:2390
 worker_thread+0x669/0x1090 kernel/workqueue.c:2537
 kthread+0x2e8/0x3a0 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308
 </TASK>