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BUG: KCSAN: data-race in netlink_getname / netlink_insert

write to 0xffff888028da62f8 of 4 bytes by task 7938 on cpu 1:
 netlink_insert+0x116/0xa20 net/netlink/af_netlink.c:568
 netlink_autobind.isra.0+0xe5/0x160 net/netlink/af_netlink.c:831
 netlink_sendmsg+0x691/0x8a0 net/netlink/af_netlink.c:1881
 sock_sendmsg_nosec net/socket.c:652 [inline]
 sock_sendmsg+0x98/0xc0 net/socket.c:672
 ____sys_sendmsg+0x493/0x4c0 net/socket.c:2362
 ___sys_sendmsg+0xb5/0x100 net/socket.c:2416
 __sys_sendmsg+0x9b/0x150 net/socket.c:2449
 __do_sys_sendmsg net/socket.c:2458 [inline]
 __se_sys_sendmsg net/socket.c:2456 [inline]
 __x64_sys_sendmsg+0x4c/0x60 net/socket.c:2456
 do_syscall_64+0xc7/0x3b0 arch/x86/entry/common.c:295
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

read to 0xffff888028da62f8 of 4 bytes by task 7946 on cpu 0:
 netlink_getname+0xe2/0x190 net/netlink/af_netlink.c:1117
 __sys_getsockname+0xa4/0x160 net/socket.c:1910
 __do_sys_getsockname net/socket.c:1925 [inline]
 __se_sys_getsockname net/socket.c:1922 [inline]
 __x64_sys_getsockname+0x48/0x60 net/socket.c:1922
 do_syscall_64+0xc7/0x3b0 arch/x86/entry/common.c:295
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 7946 Comm: syz-executor.0 Not tainted 5.7.0-rc1-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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