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BUG: KCSAN: data-race in netlink_insert / netlink_sendmsg

write to 0xffff88802cec2340 of 1 bytes by task 27125 on cpu 0:
 netlink_insert+0x636/0x8e0 net/netlink/af_netlink.c:595
 netlink_autobind+0xae/0x160 net/netlink/af_netlink.c:840
 netlink_sendmsg+0x47c/0x7c0 net/netlink/af_netlink.c:1890
 sock_sendmsg_nosec net/socket.c:654 [inline]
 sock_sendmsg net/socket.c:674 [inline]
 __sys_sendto+0x2a8/0x370 net/socket.c:1977
 __do_sys_sendto net/socket.c:1989 [inline]
 __se_sys_sendto net/socket.c:1985 [inline]
 __x64_sys_sendto+0x74/0x90 net/socket.c:1985
 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xae

read to 0xffff88802cec2340 of 1 bytes by task 27128 on cpu 1:
 netlink_sendmsg+0x26c/0x7c0 net/netlink/af_netlink.c:1889
 sock_sendmsg_nosec net/socket.c:654 [inline]
 sock_sendmsg net/socket.c:674 [inline]
 __sys_sendto+0x2a8/0x370 net/socket.c:1977
 __do_sys_sendto net/socket.c:1989 [inline]
 __se_sys_sendto net/socket.c:1985 [inline]
 __x64_sys_sendto+0x74/0x90 net/socket.c:1985
 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xae

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 27128 Comm: syz-executor.3 Not tainted 5.12.0-rc4-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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