【OLK-5.10】【openEuler-22.03-LTS】同步 5.10 测试问题：KCSAN: data-race in __seccomp_filter / copy_process

公司内部对 5.10 的 syzkaller KCSAN 测试发现如下问题：

```
==================================================================
BUG: KCSAN: data-race in __seccomp_filter / copy_process

read-write to 0xffff9e20d0a3b308 of 4 bytes by task 25128 on cpu 3:
 copy_process+0x18ce/0x1db0 kernel/fork.c:2320
 kernel_clone+0x155/0x600 kernel/fork.c:2495
 __do_sys_clone kernel/fork.c:2612 [inline]
 __se_sys_clone kernel/fork.c:2596 [inline]
 __x64_sys_clone+0xc8/0xf0 kernel/fork.c:2596
 do_syscall_64+0x37/0x50 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

read to 0xffff9e20d0a3b308 of 4 bytes by task 25131 on cpu 0:
 get_nr_threads include/linux/sched/signal.h:655 [inline]
 __seccomp_filter+0xc9b/0xdc0 kernel/seccomp.c:1263
 __secure_computing+0x8f/0x140 kernel/seccomp.c:1311
 syscall_trace_enter kernel/entry/common.c:58 [inline]
 __syscall_enter_from_user_work kernel/entry/common.c:81 [inline]
 syscall_enter_from_user_mode+0xd6/0x1b0 kernel/entry/common.c:99
 do_syscall_64+0x11/0x50 arch/x86/entry/common.c:41
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 25131 Comm: syz-executor.3 Not tainted 5.10.0+ #6
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.14.0-0-g155821a1990b-prebuilt.qemu.org 04/01/2014
==================================================================
```

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