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BUG: KCSAN: data-race in rawv6_sendmsg / sock_set_timestamping

write to 0xffff8881457c5da8 of 2 bytes by task 31593 on cpu 1:
 sock_set_timestamping+0x16b/0x320 net/core/sock.c:835
 sock_setsockopt+0xce5/0x1c70 net/core/sock.c:1076
 __sys_setsockopt+0x14f/0x200 net/socket.c:2148
 __do_sys_setsockopt net/socket.c:2163 [inline]
 __se_sys_setsockopt net/socket.c:2160 [inline]
 __x64_sys_setsockopt+0x62/0x70 net/socket.c:2160
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x3d/0x90 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

read to 0xffff8881457c5da8 of 2 bytes by task 31637 on cpu 0:
 rawv6_sendmsg+0x1be/0x1330 net/ipv6/raw.c:812
 inet_sendmsg+0x5f/0x80 net/ipv4/af_inet.c:821
 sock_sendmsg_nosec net/socket.c:702 [inline]
 sock_sendmsg net/socket.c:722 [inline]
 ____sys_sendmsg+0x360/0x4d0 net/socket.c:2385
 ___sys_sendmsg net/socket.c:2439 [inline]
 __sys_sendmmsg+0x315/0x4b0 net/socket.c:2525
 __do_sys_sendmmsg net/socket.c:2554 [inline]
 __se_sys_sendmmsg net/socket.c:2551 [inline]
 __x64_sys_sendmmsg+0x53/0x60 net/socket.c:2551
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x3d/0x90 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

value changed: 0x0000 -> 0x03bb

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 31637 Comm: syz-executor.5 Tainted: G        W         5.13.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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