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BUG: KCSAN: data-race in netlink_getname / netlink_insert

read to 0xffff88809d216af8 of 4 bytes by task 14504 on cpu 1:
 netlink_getname+0xfb/0x1b0 net/netlink/af_netlink.c:1116
 __sys_getsockname+0xbd/0x1a0 net/socket.c:1862
 __do_sys_getsockname net/socket.c:1877 [inline]
 __se_sys_getsockname net/socket.c:1874 [inline]
 __x64_sys_getsockname+0x4c/0x60 net/socket.c:1874
 do_syscall_64+0xcc/0x370 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

write to 0xffff88809d216af8 of 4 bytes by task 14501 on cpu 0:
 netlink_insert+0x12a/0x930 net/netlink/af_netlink.c:568
 netlink_autobind.isra.0+0xf8/0x170 net/netlink/af_netlink.c:831
 netlink_sendmsg+0x5eb/0x770 net/netlink/af_netlink.c:1880
 sock_sendmsg_nosec net/socket.c:637 [inline]
 sock_sendmsg+0x9f/0xc0 net/socket.c:657
 ___sys_sendmsg+0x59d/0x5d0 net/socket.c:2311
 __sys_sendmsg+0xa0/0x160 net/socket.c:2356
 __do_sys_sendmsg net/socket.c:2365 [inline]
 __se_sys_sendmsg net/socket.c:2363 [inline]
 __x64_sys_sendmsg+0x51/0x70 net/socket.c:2363
 do_syscall_64+0xcc/0x370 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 14501 Comm: syz-executor.4 Not tainted 5.4.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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