[5.10][syzkaller] KCSAN: data-race in ipv6_setsockopt / sock_common_setsockopt

```
BUG: KCSAN: data-race in ipv6_setsockopt / sock_common_setsockopt

write to 0xffff9d2f4e9a40e8 of 8 bytes by task 20017 on cpu 0:
 do_ipv6_setsockopt net/ipv6/ipv6_sockglue.c:476 [inline]
 ipv6_setsockopt+0x2813/0x2a00 net/ipv6/ipv6_sockglue.c:1003
 tcp_setsockopt+0x159/0x1cf0 net/ipv4/tcp.c:3446
 sock_common_setsockopt+0x62/0x80 net/core/sock.c:3254
 __sys_setsockopt+0x195/0x200 net/socket.c:2121
 __do_sys_setsockopt net/socket.c:2132 [inline]
 __se_sys_setsockopt net/socket.c:2129 [inline]
 __x64_sys_setsockopt+0x62/0x70 net/socket.c:2129
 do_syscall_64+0x37/0x50 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

read to 0xffff9d2f4e9a40e8 of 8 bytes by task 20018 on cpu 1:
 sock_common_setsockopt+0x39/0x80 net/core/sock.c:3254
 __sys_setsockopt+0x195/0x200 net/socket.c:2121
 __do_sys_setsockopt net/socket.c:2132 [inline]
 __se_sys_setsockopt net/socket.c:2129 [inline]
 __x64_sys_setsockopt+0x62/0x70 net/socket.c:2129
 do_syscall_64+0x37/0x50 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 20018 Comm: syz-executor.3 Not tainted 5.10.0+ #1
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.14.0-0-g155821a1990b-prebuilt.qemu.org 04/01/2014
==================================================================
EXT4-fs error (device loop1): ext4_fill_super:4933: inode #2: comm syz-executor.1: iget: bogus i_mode (166400)
EXT4-fs (loop1): get root inode failed
EXT4-fs (loop1): mount failed
```

GVP openEuler/kernel
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