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BUG: KCSAN: data-race in netlink_getname / netlink_insert

write to 0xffff88808185b2f8 of 4 bytes by task 29554 on cpu 0:
 netlink_insert+0xe8/0x8f0 net/netlink/af_netlink.c:568
 netlink_autobind+0xa9/0x150 net/netlink/af_netlink.c:831
 netlink_sendmsg+0x46f/0x7a0 net/netlink/af_netlink.c:1881
 sock_sendmsg_nosec net/socket.c:652 [inline]
 sock_sendmsg net/socket.c:672 [inline]
 ____sys_sendmsg+0x360/0x4d0 net/socket.c:2352
 ___sys_sendmsg net/socket.c:2406 [inline]
 __sys_sendmsg+0x1df/0x260 net/socket.c:2439
 __do_sys_sendmsg net/socket.c:2448 [inline]
 __se_sys_sendmsg net/socket.c:2446 [inline]
 __x64_sys_sendmsg+0x42/0x50 net/socket.c:2446
 do_syscall_64+0x51/0xb0 arch/x86/entry/common.c:384
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

read to 0xffff88808185b2f8 of 4 bytes by task 29674 on cpu 1:
 netlink_getname+0xbb/0x180 net/netlink/af_netlink.c:1117
 __sys_getsockname+0x10a/0x1b0 net/socket.c:1905
 __do_sys_getsockname net/socket.c:1920 [inline]
 __se_sys_getsockname net/socket.c:1917 [inline]
 __x64_sys_getsockname+0x3e/0x50 net/socket.c:1917
 do_syscall_64+0x51/0xb0 arch/x86/entry/common.c:384
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 29674 Comm: syz-executor.5 Not tainted 5.8.0-rc5-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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