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BUG: KCSAN: data-race in __sock_set_timestamps / pfkey_recvmsg

write to 0xffff888021e19860 of 8 bytes by task 28076 on cpu 0:
 __sock_set_timestamps+0x2e/0x150 net/core/sock.c:751
 sock_setsockopt+0xc8f/0x1ef0 net/core/sock.c:987
 __sys_setsockopt+0x326/0x450 net/socket.c:2128
 __do_sys_setsockopt net/socket.c:2143 [inline]
 __se_sys_setsockopt net/socket.c:2140 [inline]
 __x64_sys_setsockopt+0x62/0x70 net/socket.c:2140
 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

read to 0xffff888021e19860 of 8 bytes by task 28080 on cpu 1:
 sock_recv_ts_and_drops include/net/sock.h:2455 [inline]
 pfkey_recvmsg+0x1a3/0x370 net/key/af_key.c:3718
 ____sys_recvmsg+0x15d/0x310 include/linux/uio.h:234
 ___sys_recvmsg net/socket.c:2618 [inline]
 do_recvmmsg+0x4b3/0x990 net/socket.c:2718
 __sys_recvmmsg net/socket.c:2799 [inline]
 __do_sys_recvmmsg net/socket.c:2820 [inline]
 __se_sys_recvmmsg net/socket.c:2813 [inline]
 __x64_sys_recvmmsg+0xe6/0x150 net/socket.c:2813
 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 28080 Comm: syz-executor.4 Not tainted 5.10.0-rc6-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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