leaked reference.
 __netns_tracker_alloc include/net/net_namespace.h:331 [inline]
 sk_alloc+0x6c0/0x7a0 net/core/sock.c:2106
 inet_create net/ipv4/af_inet.c:319 [inline]
 inet_create+0x399/0xea0 net/ipv4/af_inet.c:245
 __sock_create+0x359/0x790 net/socket.c:1540
 __smc_create net/smc/af_smc.c:3265 [inline]
 smc_create+0x1fc/0x2d0 net/smc/af_smc.c:3282
 __sock_create+0x359/0x790 net/socket.c:1540
 sock_create net/socket.c:1591 [inline]
 __sys_socket_create net/socket.c:1628 [inline]
 __sys_socket_create net/socket.c:1613 [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: 2398 at lib/ref_tracker.c:39 spin_unlock_irqrestore include/linux/spinlock.h:405 [inline]
WARNING: CPU: 1 PID: 2398 at lib/ref_tracker.c:39 ref_tracker_dir_exit.cold+0x137/0x1e3 lib/ref_tracker.c:38
Modules linked in:
CPU: 1 PID: 2398 Comm: kworker/u4:6 Not tainted 6.2.0-rc6-syzkaller-01334-gc21adf256f8d #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/12/2023
Workqueue: netns cleanup_net
RIP: 0010:ref_tracker_dir_exit.cold+0x137/0x1e3 lib/ref_tracker.c:39
Code: 4c 89 ef e8 94 fa f9 f7 4c 8b 3c 24 4c 39 fd 49 8b 07 0f 85 b5 00 00 00 e8 cf a0 ab f7 48 8b 74 24 10 4c 89 e7 e8 c2 38 38 00 <0f> 0b e9 04 b8 64 fa 4c 89 ff e8 63 fa f9 f7 e9 d4 fe ff ff e8 39
RSP: 0018:ffffc9000a69fc00 EFLAGS: 00010246
RAX: 0000000000000000 RBX: dffffc0000000000 RCX: 0000000000000000
RDX: 0000000000000001 RSI: 0000000000000001 RDI: 0000000000000001
RBP: ffff88807f2d3b90 R08: 0000000000000001 R09: ffffffff9134fbcf
R10: 0000000000000001 R11: 0000000000000000 R12: ffff88807f2d3b40
R13: ffff88807f2d3b90 R14: ffff88807f2d3b90 R15: ffff88807f2d3b90
FS:  0000000000000000(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000056006b532bf8 CR3: 0000000029569000 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+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>