【OpenHarmony】【20210409】【轻内核子系统】集成测试ActsNFSTest.bin会引起内核crash

### 该问题是怎么引起的？

acts测试

### 重现步骤
1、加载下面版本
4-9版本
码云主干
hispark-taurus版本：
https://hm-verify.obs.cn-north-4.myhuaweicloud.com/version/Daily_Version/2021-04-09_00-06-53/hispark_taurus.tar.gz

2、mkdir test_root
mkdir /test_root/kernel

mount 192.168.1.2:/nfs  /test_root/kernel  nfs

3、编译ActsFSTest的用例，执行ActsNFSTest.bin
hb build -T //test/xts/acts/kernel_lite/fs_posix:ActsFSTest

### 报错信息
OHOS # ./ActsNFSTest.bin --get  test_filter=*testReaddir*
OHOS # [ERR]OsVmPageFaultHandler 352 ##################excFrom: kernel!###################
cpu0 is in exc.
cpu1 is halted.
The current handling the exception is cpu0 !
data_abort fsr:0x5, far:0x00000005
Abort caused by a read instruction. Translation fault, section
excType: data abort
processName       = ActsNFSTest.bin
processID         = 13
process aspace    = 0x01000000 -> 0x3f000000
taskName          = ActsNFSTest.bin
taskID            = 77
task user stack   = 0x3cb98000 -> 0x3cc98000
pc    = 0x4058ce38 
klr   = 0x4055bc88
ksp   = 0x42102d00

fp    = 0x42102d28
R0    = 0x5
R1    = 0x417b6eb0
R2    = 0x417b71e3
R3    = 0x4058ce28
R4    = 0x4178f4f4
R5    = 0x417b71e3
R6    = 0x417b6eb0
R7    = 0x406c4cc0
R8    = 0x3cc97a6c
R9    = 0x8777d51
R10   = 0x8778960
R11   = 0x42102d28
R12   = 0x1
CPSR  = 0x20010013
*******backtrace begin*******
traceback fp fixed, trace using   fp = 0x42102e60
traceback 0 -- lr = 0x40579e60    fp = 0x42102e80
traceback 1 -- lr = 0x405733b8    fp = 0x42102eb8
traceback 2 -- lr = 0x40002cd8    fp = 0x0

allCpu(%):    5.18 sys,  194.82 idle

PID  PPID PGID       UID  Status CPUUSE CPUUSE10s CPUUSE1s Policy Priority MTID TaskTotal   Mode  PName
    1    -1    1         0 Pending   0.1       0.0      0.0      RR       28   23         1   user  init                            
    2    -1    2         0 Running   1.95      1.33     1.9      RR        0    0        24 kernel  KProcess                        
    3     1    1         2 Pending   0.8       0.46     0.0      RR       15    4         3   user  shell                           
    4     1    4         4 Pending   0.2       0.0      0.0      RR       28   24         1   user  apphilogcat                     
    5     1    5         7 Pending   0.10      0.5      0.5      RR       28   25        17   user  foundation                      
    6     1    6         8 Pending   0.0       0.0      0.0      RR       28   26         4   user  bundle_daemon                   
    7     1    7         1 Pending   0.4       0.0      0.0      RR       28   27         5   user  appspawn                        
    8     1    8         5 Pending   0.1       0.0      0.0      RR       28   28         1   user  media_server                    
    9     1    9         0 Pending   0.93      0.92     0.91     RR       28   29         8   user  wms_server                      
   10     1   10         0 Pending   0.0       0.0      0.0      RR       28   30         4   user  sensor_service                  
   11     1   11         9 Pending   0.0       0.0      0.0      RR       28   31         4   user  ai_server                       
   12     7    7       101 Pending   0.99      0.91     0.88     RR       28   74         3   user  com.huawei.launcher             
   13     3   13         2 Running   0.0       0.0      0.0      RR       15   77         1   user  ActsNFSTest.bin

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