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BUG: KCSAN: data-race in netlink_recvmsg / netlink_recvmsg

write to 0xffff88811ca5bb08 of 8 bytes by task 16290 on cpu 0:
 netlink_recvmsg+0xd5/0x760 net/netlink/af_netlink.c:1975
 ____sys_recvmsg+0x15d/0x310 include/linux/uio.h:234
 ___sys_recvmsg net/socket.c:2611 [inline]
 __sys_recvmsg+0x1d2/0x3a0 net/socket.c:2641
 __do_sys_recvmsg net/socket.c:2651 [inline]
 __se_sys_recvmsg net/socket.c:2648 [inline]
 __x64_sys_recvmsg+0x42/0x50 net/socket.c:2648
 do_syscall_64+0x34/0x50 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xae

read to 0xffff88811ca5bb08 of 8 bytes by task 16291 on cpu 1:
 netlink_recvmsg+0x8d/0x760 net/netlink/af_netlink.c:1974
 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+0x34/0x50 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xae

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 16291 Comm: syz-executor.1 Not tainted 5.12.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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