netlink_unicast_kernel net/netlink/af_netlink.c:1317 [inline]
 netlink_unicast+0x533/0x7d0 net/netlink/af_netlink.c:1343
 netlink_sendmsg+0x904/0xdf0 net/netlink/af_netlink.c:1919
 sock_sendmsg_nosec net/socket.c:705 [inline]
 sock_sendmsg+0xcf/0x120 net/socket.c:725
 ____sys_sendmsg+0x331/0x810 net/socket.c:2413
 ___sys_sendmsg+0xf3/0x170 net/socket.c:2467
 __sys_sendmmsg+0x195/0x470 net/socket.c:2553
 __do_sys_sendmmsg net/socket.c:2582 [inline]
 __se_sys_sendmmsg net/socket.c:2579 [inline]
 __x64_sys_sendmmsg+0x99/0x100 net/socket.c:2579
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae
------------[ cut here ]------------
WARNING: CPU: 1 PID: 5831 at lib/ref_tracker.c:38 spin_unlock_irqrestore include/linux/spinlock.h:409 [inline]
WARNING: CPU: 1 PID: 5831 at lib/ref_tracker.c:38 ref_tracker_dir_exit.cold+0x137/0x1e3 lib/ref_tracker.c:37
Modules linked in:
CPU: 1 PID: 5831 Comm: syz-executor.4 Not tainted 5.16.0-rc8-next-20220110-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:ref_tracker_dir_exit.cold+0x137/0x1e3 lib/ref_tracker.c:38
Code: 4c 89 ef e8 a2 45 9e f8 4c 8b 3c 24 4c 39 fd 49 8b 07 0f 85 b5 00 00 00 e8 4d 57 53 f8 48 8b 74 24 10 4c 89 e7 e8 10 25 37 00 <0f> 0b e9 1c c7 e6 fa 4c 89 ff e8 71 45 9e f8 e9 d4 fe ff ff e8 57
RSP: 0018:ffffc9000566f8f8 EFLAGS: 00010246
RAX: 0000000000000000 RBX: dffffc0000000000 RCX: 0000000000000000
RDX: 0000000000000001 RSI: 0000000000000001 RDI: 0000000000000001
RBP: ffff8880449c1c18 R08: 0000000000000001 R09: ffffffff8ffd0967
R10: 0000000000000001 R11: 0000000000000000 R12: ffff8880449c1bd0
R13: ffff8880449c1c18 R14: ffff8880449c1c18 R15: ffff8880449c1c18
FS:  0000000000000000(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f79a2227518 CR3: 000000001ed12000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 __put_net+0x15/0x70 net/core/net_namespace.c:640
 put_net include/net/net_namespace.h:268 [inline]
 put_net_track include/net/net_namespace.h:342 [inline]
 __sk_destruct+0x5f7/0x710 net/core/sock.c:2042
 sk_destruct+0xbd/0xe0 net/core/sock.c:2058
 __sk_free+0xef/0x3d0 net/core/sock.c:2069
 sk_free+0x78/0xa0 net/core/sock.c:2080
 sock_put include/net/sock.h:1912 [inline]
 __tun_detach+0xdb2/0x13d0 drivers/net/tun.c:681
 tun_detach drivers/net/tun.c:693 [inline]
 tun_chr_close+0xc4/0x180 drivers/net/tun.c:3405
 __fput+0x286/0x9f0 fs/file_table.c:311
 task_work_run+0xdd/0x1a0 kernel/task_work.c:164
 exit_task_work include/linux/task_work.h:32 [inline]
 do_exit+0xb31/0x2b10 kernel/exit.c:793
 do_group_exit+0x128/0x330 kernel/exit.c:931
 get_signal+0x4b0/0x28c0 kernel/signal.c:2868
 arch_do_signal_or_restart+0x2a9/0x1c40 arch/x86/kernel/signal.c:868
 handle_signal_work kernel/entry/common.c:148 [inline]
 exit_to_user_mode_loop kernel/entry/common.c:172 [inline]
 exit_to_user_mode_prepare+0x17d/0x290 kernel/entry/common.c:207
 __syscall_exit_to_user_mode_work kernel/entry/common.c:289 [inline]
 syscall_exit_to_user_mode+0x19/0x60 kernel/entry/common.c:300
 do_syscall_64+0x42/0xb0 arch/x86/entry/common.c:86
 entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x7f3d1a127e99
Code: Unable to access opcode bytes at RIP 0x7f3d1a127e6f.
RSP: 002b:00007f3d18a9d218 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: fffffffffffffe00 RBX: 00007f3d1a23af68 RCX: 00007f3d1a127e99
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007f3d1a23af68
RBP: 00007f3d1a23af60 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f3d1a23af6c
R13: 00007ffdebba82bf R14: 00007f3d18a9d300 R15: 0000000000022000
 </TASK>