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BUG: KCSAN: data-race in netlink_getname / netlink_insert

write to 0xffff8881303ce300 of 4 bytes by task 2846 on cpu 1:
 netlink_insert+0xe8/0x900 net/netlink/af_netlink.c:581
 netlink_autobind+0xae/0x160 net/netlink/af_netlink.c:843
 netlink_sendmsg+0x4bb/0x850 net/netlink/af_netlink.c:1882
 sock_sendmsg_nosec net/socket.c:705 [inline]
 sock_sendmsg net/socket.c:725 [inline]
 ____sys_sendmsg+0x39a/0x510 net/socket.c:2413
 ___sys_sendmsg net/socket.c:2467 [inline]
 __sys_sendmsg+0x195/0x230 net/socket.c:2496
 __do_sys_sendmsg net/socket.c:2505 [inline]
 __se_sys_sendmsg net/socket.c:2503 [inline]
 __x64_sys_sendmsg+0x42/0x50 net/socket.c:2503
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

read to 0xffff8881303ce300 of 4 bytes by task 2850 on cpu 0:
 netlink_getname+0xbb/0x180 net/netlink/af_netlink.c:1131
 __sys_getsockname+0x11d/0x1b0 net/socket.c:1950
 __do_sys_getsockname net/socket.c:1965 [inline]
 __se_sys_getsockname net/socket.c:1962 [inline]
 __x64_sys_getsockname+0x3e/0x50 net/socket.c:1962
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

value changed: 0x00000000 -> 0xe459a457

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 2850 Comm: syz-executor.4 Not tainted 5.16.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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