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BUG: KCSAN: data-race in netlink_insert / netlink_sendmsg

write to 0xffff88801c557340 of 1 bytes by task 21662 on cpu 1:
 netlink_insert+0x636/0x8e0 net/netlink/af_netlink.c:587
 netlink_autobind+0xa9/0x150 net/netlink/af_netlink.c:832
 netlink_sendmsg+0x47c/0x7c0 net/netlink/af_netlink.c:1882
 sock_sendmsg_nosec net/socket.c:652 [inline]
 sock_sendmsg net/socket.c:672 [inline]
 sock_write_iter+0x1a4/0x200 net/socket.c:999
 call_write_iter include/linux/fs.h:1901 [inline]
 do_iter_readv_writev+0x2cb/0x360 fs/read_write.c:740
 do_iter_write+0x112/0x4b0 fs/read_write.c:866
 vfs_writev fs/read_write.c:939 [inline]
 do_writev+0x201/0x460 fs/read_write.c:982
 __do_sys_writev fs/read_write.c:1055 [inline]
 __se_sys_writev fs/read_write.c:1052 [inline]
 __x64_sys_writev+0x41/0x50 fs/read_write.c:1052
 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

read to 0xffff88801c557340 of 1 bytes by task 21652 on cpu 0:
 netlink_sendmsg+0x26c/0x7c0 net/netlink/af_netlink.c:1881
 sock_sendmsg_nosec net/socket.c:652 [inline]
 sock_sendmsg net/socket.c:672 [inline]
 sock_write_iter+0x1a4/0x200 net/socket.c:999
 call_write_iter include/linux/fs.h:1901 [inline]
 do_iter_readv_writev+0x2cb/0x360 fs/read_write.c:740
 do_iter_write+0x112/0x4b0 fs/read_write.c:866
 vfs_writev fs/read_write.c:939 [inline]
 do_writev+0x201/0x460 fs/read_write.c:982
 __do_sys_writev fs/read_write.c:1055 [inline]
 __se_sys_writev fs/read_write.c:1052 [inline]
 __x64_sys_writev+0x41/0x50 fs/read_write.c:1052
 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 21652 Comm: syz-executor.0 Not tainted 5.11.0-rc4-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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