==================================================================
BUG: KCSAN: data-race in netlink_insert / netlink_sendmsg

write to 0xffff88813a203328 of 1 bytes by task 23991 on cpu 0:
 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:702 [inline]
 sock_sendmsg net/socket.c:722 [inline]
 ____sys_sendmsg+0x360/0x4d0 net/socket.c:2385
 ___sys_sendmsg net/socket.c:2439 [inline]
 __sys_sendmsg+0x1ed/0x270 net/socket.c:2468
 __do_sys_sendmsg net/socket.c:2477 [inline]
 __se_sys_sendmsg net/socket.c:2475 [inline]
 __x64_sys_sendmsg+0x42/0x50 net/socket.c:2475
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x3d/0x90 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

read to 0xffff88813a203328 of 1 bytes by task 23994 on cpu 1:
 netlink_sendmsg+0x26c/0x7c0 net/netlink/af_netlink.c:1891
 sock_sendmsg_nosec net/socket.c:702 [inline]
 sock_sendmsg net/socket.c:722 [inline]
 __sys_sendto+0x2a8/0x370 net/socket.c:2012
 __do_sys_sendto net/socket.c:2024 [inline]
 __se_sys_sendto net/socket.c:2020 [inline]
 __x64_sys_sendto+0x74/0x90 net/socket.c:2020
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x3d/0x90 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

value changed: 0x00 -> 0x01

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 23994 Comm: syz-executor.0 Not tainted 5.13.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
==================================================================