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BUG: KCSAN: data-race in __sock_set_timestamps / udpv6_recvmsg

write to 0xffff888105ba2560 of 8 bytes by task 19521 on cpu 0:
 __sock_set_timestamps+0x2e/0x150
 sock_set_timestamp+0x86/0x90
 sock_setsockopt+0x1015/0x1de0 net/core/sock.c:1120
 __sys_setsockopt+0x14f/0x200 net/socket.c:2172
 __do_sys_setsockopt net/socket.c:2187 [inline]
 __se_sys_setsockopt net/socket.c:2184 [inline]
 __x64_sys_setsockopt+0x62/0x70 net/socket.c:2184
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x44/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

read to 0xffff888105ba2560 of 8 bytes by task 19524 on cpu 1:
 sock_recv_ts_and_drops include/net/sock.h:2567 [inline]
 udpv6_recvmsg+0x75c/0xce0 net/ipv6/udp.c:392
 inet6_recvmsg+0xa3/0x200 net/ipv6/af_inet6.c:659
 ____sys_recvmsg+0x16c/0x320
 ___sys_recvmsg net/socket.c:2670 [inline]
 do_recvmmsg+0x3f5/0xae0 net/socket.c:2764
 __sys_recvmmsg net/socket.c:2843 [inline]
 __do_sys_recvmmsg net/socket.c:2866 [inline]
 __se_sys_recvmmsg net/socket.c:2859 [inline]
 __x64_sys_recvmmsg+0xde/0x160 net/socket.c:2859
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x44/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

value changed: 0x0000000000800100 -> 0x0000000000800980

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 19524 Comm: syz-executor.5 Not tainted 5.15.0-rc7-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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