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BUG: KCSAN: data-race in sock_enable_timestamp / udp_lib_get_port

read to 0xffff888123de4060 of 8 bytes by task 21530 on cpu 0:
 sock_enable_timestamp+0x5c/0xe0 net/core/sock.c:3048
 sock_gettstamp+0x5c/0x1f0 net/core/sock.c:3012
 sock_ioctl+0x28e/0x5e0 net/socket.c:1184
 vfs_ioctl fs/ioctl.c:46 [inline]
 file_ioctl fs/ioctl.c:509 [inline]
 do_vfs_ioctl+0x991/0xc60 fs/ioctl.c:696
 ksys_ioctl+0xbd/0xe0 fs/ioctl.c:713
 __do_sys_ioctl fs/ioctl.c:720 [inline]
 __se_sys_ioctl fs/ioctl.c:718 [inline]
 __x64_sys_ioctl+0x4c/0x60 fs/ioctl.c:718
 do_syscall_64+0xcc/0x370 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

write to 0xffff888123de4060 of 8 bytes by task 21527 on cpu 1:
 __set_bit include/asm-generic/bitops-instrumented.h:46 [inline]
 sock_set_flag include/net/sock.h:828 [inline]
 udp_lib_get_port+0x530/0xd10 net/ipv4/udp.c:332
 udp_v6_get_port+0x262/0x3a0 net/ipv6/udp.c:89
 __inet6_bind+0x387/0xd80 net/ipv6/af_inet6.c:403
 inet6_bind+0xc6/0x103 net/ipv6/af_inet6.c:453
 __sys_bind+0x1df/0x220 net/socket.c:1647
 __do_sys_bind net/socket.c:1658 [inline]
 __se_sys_bind net/socket.c:1656 [inline]
 __x64_sys_bind+0x4c/0x60 net/socket.c:1656
 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: 21527 Comm: syz-executor.5 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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