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BUG: KCSAN: data-race in netlink_recvmsg / netlink_recvmsg

read to 0xffff88810605a320 of 8 bytes by task 23917 on cpu 0:
 netlink_recvmsg+0xf3/0x910 net/netlink/af_netlink.c:1964
 sock_recvmsg_nosec net/socket.c:871 [inline]
 sock_recvmsg net/socket.c:889 [inline]
 sock_recvmsg+0x92/0xb0 net/socket.c:885
 ___sys_recvmsg+0x1a0/0x3e0 net/socket.c:2480
 __sys_recvmsg+0x9d/0x160 net/socket.c:2537
 __do_sys_recvmsg net/socket.c:2547 [inline]
 __se_sys_recvmsg net/socket.c:2544 [inline]
 __x64_sys_recvmsg+0x51/0x70 net/socket.c:2544
 do_syscall_64+0xcc/0x370 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

write to 0xffff88810605a320 of 8 bytes by task 23915 on cpu 1:
 netlink_recvmsg+0x124/0x910 net/netlink/af_netlink.c:1965
 sock_recvmsg_nosec+0x5c/0x70 net/socket.c:871
 ___sys_recvmsg+0x1a0/0x3e0 net/socket.c:2480
 do_recvmmsg+0x19a/0x5c0 net/socket.c:2601
 __sys_recvmmsg+0x1ef/0x200 net/socket.c:2680
 __do_sys_recvmmsg net/socket.c:2703 [inline]
 __se_sys_recvmmsg net/socket.c:2696 [inline]
 __x64_sys_recvmmsg+0x89/0xb0 net/socket.c:2696
 do_syscall_64+0xcc/0x370 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 23915 Comm: syz-executor.0 Not tainted 5.4.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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