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BUG: KCSAN: data-race in netlink_recvmsg / netlink_recvmsg

write to 0xffff88811d707b08 of 8 bytes by task 770 on cpu 1:
 netlink_recvmsg+0xd5/0x760 net/netlink/af_netlink.c:1977
 sock_recvmsg_nosec net/socket.c:888 [inline]
 sock_recvmsg net/socket.c:906 [inline]
 __sys_recvfrom+0x1d7/0x2a0 net/socket.c:2034
 __do_sys_recvfrom net/socket.c:2052 [inline]
 __se_sys_recvfrom net/socket.c:2048 [inline]
 __x64_sys_recvfrom+0x74/0x90 net/socket.c:2048
 do_syscall_64+0x4a/0x90 arch/x86/entry/common.c:47
 entry_SYSCALL_64_after_hwframe+0x44/0xae

read to 0xffff88811d707b08 of 8 bytes by task 759 on cpu 0:
 netlink_recvmsg+0x8d/0x760 net/netlink/af_netlink.c:1976
 ____sys_recvmsg+0x15d/0x310 include/linux/uio.h:244
 ___sys_recvmsg net/socket.c:2611 [inline]
 do_recvmmsg+0x34c/0x9e0 net/socket.c:2705
 __sys_recvmmsg net/socket.c:2784 [inline]
 __do_sys_recvmmsg net/socket.c:2807 [inline]
 __se_sys_recvmmsg net/socket.c:2800 [inline]
 __x64_sys_recvmmsg+0xcf/0x150 net/socket.c:2800
 do_syscall_64+0x4a/0x90 arch/x86/entry/common.c:47
 entry_SYSCALL_64_after_hwframe+0x44/0xae

value changed: 0x0000000000000000 -> 0x0000000000001000

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 759 Comm: syz-executor.1 Not tainted 5.13.0-rc4-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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