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BUG: KCSAN: data-race in netlink_insert / netlink_sendmsg

write to 0xffff888143a9c328 of 1 bytes by task 23966 on cpu 1:
 netlink_insert+0x5cc/0x7f0 net/netlink/af_netlink.c:597
 netlink_autobind+0xa9/0x150 net/netlink/af_netlink.c:842
 netlink_sendmsg+0x47c/0x7c0 net/netlink/af_netlink.c:1892
 sock_sendmsg_nosec net/socket.c:654 [inline]
 sock_sendmsg net/socket.c:674 [inline]
 __sys_sendto+0x2a8/0x370 net/socket.c:1964
 __do_sys_sendto net/socket.c:1976 [inline]
 __se_sys_sendto net/socket.c:1972 [inline]
 __x64_sys_sendto+0x74/0x90 net/socket.c:1972
 do_syscall_64+0x44/0x80 arch/x86/entry/common.c:47
 entry_SYSCALL_64_after_hwframe+0x44/0xae

read to 0xffff888143a9c328 of 1 bytes by task 23967 on cpu 0:
 netlink_sendmsg+0x26c/0x7c0 net/netlink/af_netlink.c:1891
 sock_sendmsg_nosec net/socket.c:654 [inline]
 sock_sendmsg net/socket.c:674 [inline]
 ____sys_sendmsg+0x360/0x4d0 net/socket.c:2337
 ___sys_sendmsg net/socket.c:2391 [inline]
 __sys_sendmsg+0x1ed/0x270 net/socket.c:2420
 __do_sys_sendmsg net/socket.c:2429 [inline]
 __se_sys_sendmsg net/socket.c:2427 [inline]
 __x64_sys_sendmsg+0x42/0x50 net/socket.c:2427
 do_syscall_64+0x44/0x80 arch/x86/entry/common.c:47
 entry_SYSCALL_64_after_hwframe+0x44/0xae

value changed: 0x00 -> 0x01

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 23967 Comm: syz-executor.4 Not tainted 5.13.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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