netlink_rcv_skb+0x153/0x420 net/netlink/af_netlink.c:2494 genl_rcv+0x24/0x40 net/netlink/genetlink.c:803 netlink_unicast_kernel net/netlink/af_netlink.c:1317 [inline] netlink_unicast+0x539/0x7e0 net/netlink/af_netlink.c:1343 netlink_sendmsg+0x904/0xe00 net/netlink/af_netlink.c:1919 sock_sendmsg_nosec net/socket.c:705 [inline] sock_sendmsg+0xcf/0x120 net/socket.c:725 ____sys_sendmsg+0x6e8/0x810 net/socket.c:2413 ___sys_sendmsg+0xf3/0x170 net/socket.c:2467 __sys_sendmsg+0xe5/0x1b0 net/socket.c:2496 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: 0 PID: 3711 at lib/ref_tracker.c:38 spin_unlock_irqrestore include/linux/spinlock.h:404 [inline] WARNING: CPU: 0 PID: 3711 at lib/ref_tracker.c:38 ref_tracker_dir_exit.cold+0x137/0x1e3 lib/ref_tracker.c:37 Modules linked in: CPU: 0 PID: 3711 Comm: kworker/u4:6 Not tainted 5.17.0-rc2-syzkaller-00054-g27bb0b18c208 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: netns cleanup_net RIP: 0010:ref_tracker_dir_exit.cold+0x137/0x1e3 lib/ref_tracker.c:38 Code: 4c 89 ef e8 c4 26 a9 f8 4c 8b 3c 24 4c 39 fd 49 8b 07 0f 85 b5 00 00 00 e8 ff e4 61 f8 48 8b 74 24 10 4c 89 e7 e8 52 78 36 00 <0f> 0b e9 3e 2b ea fa 4c 89 ff e8 93 26 a9 f8 e9 d4 fe ff ff e8 79 RSP: 0018:ffffc90002d3f978 EFLAGS: 00010246 RAX: 0000000000000000 RBX: dffffc0000000000 RCX: 0000000000000000 RDX: 0000000000000001 RSI: 0000000000000001 RDI: 0000000000000001 RBP: ffff88802f99c600 R08: 0000000000000001 R09: ffffffff8ffbd94f R10: 0000000000000001 R11: 0000000000000001 R12: ffff88802f99c5b8 R13: ffff88802f99c600 R14: ffff88802f99c600 R15: ffff88802f99c600 FS: 0000000000000000(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fff099ad898 CR3: 000000001ee91000 CR4: 0000000000350ef0 Call Trace: free_netdev+0x32a/0x5b0 net/core/dev.c:10288 netdev_run_todo+0x8a0/0xaa0 net/core/dev.c:9964 default_device_exit_batch+0x2ff/0x3c0 net/core/dev.c:10946 ops_exit_list+0x125/0x170 net/core/net_namespace.c:173 cleanup_net+0x4ea/0xb00 net/core/net_namespace.c:597 process_one_work+0x9ac/0x1650 kernel/workqueue.c:2307 worker_thread+0x657/0x1110 kernel/workqueue.c:2454 kthread+0x2e9/0x3a0 kernel/kthread.c:377 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295