【OpenHarmony】【3.0.0.8】【轻内核子系统】集成测试fs_posix模块nfs用例跑多次会出现不停打印申请内存失败问题

【模块名_概率】简要描述：
fs_posix模块连续多次跑nfs用例会出现时不时打印几条申请内存失败错误到后来不停打印申请内存失败问题；

重现步骤
1.使用Hi3516DV300的单板
2.将单板的版本设置成3.0.0.8的版本。版本链接：http://download.ci.openharmony.cn/version/Master_Version/OpenHamrony_3.0.0.8/20210917_144820/version-Master_Version-OpenHamrony_3.0.0.8-20210917_144820-hispark_taurus.tar.gz
3.使用命令编译出bin文件：hb build -T //test/xts/acts/kernel_lite/fs_posix:ActsNFSTest
4.执行./ActsNFSTest.bin --gtest_repeat=1000

失败信息：
用例跑到452次第一次出现
[       OK ] FileSystemTest.testFtw (47 ms)

[ RUN      ] FileSystemTest.testNftw

------- case start

current Path = /test_root/kernel,path1=/test_root/kernel

== chdir to /test_root/kernel OK!

[ERR]OsMemPoolExpand alloc failed size = 5189632
[ERR]OsMemPoolExpand alloc failed size = 5189632
[ERR]OsMemPoolExpand alloc failed size = 5189632
[ERR]OsMemPoolExpand alloc failed size = 5189632
[ERR]OsMemPoolExpand alloc failed size = 5189632
[ERR]OsMemPoolExpand alloc failed size = 5189632
[ERR]OsMemPoolExpand alloc failed size = 5189632
[ERR]OsMemPoolExpand alloc failed size = 5189632
[ERR]OsMemPoolExpand alloc failed size = 5189632
> Dir  DIR0

[ERR]OsMemPoolExpand alloc failed size = 5189632
[ERR]OsMemPoolExpand alloc failed size = 5189632
[ERR]OsMemPoolExpand alloc failed size = 5193728
> Dir  DIR0/DIR0_DIR0

> Dir  DIR0/DIR0_DIR1

跑完1000次后就不停打印内存失败信息：
[ERR]OsMemPoolExpand alloc failed size = 9703424
[ERR]OsMemPoolExpand alloc failed size = 9703424
Gtest xml output finished

[==========] 45 tests from 1 test case ran. (6383 ms total)

[  PASSED  ] 45 tests.

[ERR]OsMemPoolExpand alloc failed size = 9703424
[ERR]OsMemPoolExpand alloc failed size = 9703424
[ERR]OsMemPoolExpand alloc failed size = 9703424
[ERR]OsMemPoolExpand alloc failed size = 9703424
[ERR]OsMemPoolExpand alloc failed size = 9703424
[ERR]OsMemPoolExpand alloc failed size = 9703424
[ERR]OsMemPoolExpand alloc failed size = 9703424
[ERR]OsMemPoolExpand alloc failed size = 9703424
[ERR]OsMemPoolExpand alloc failed size = 9703424
[ERR]OsMemPoolExpand alloc failed size = 9703424
[ERR]OsMemPoolExpand alloc failed size = 9703424
[ERR]OsMemPoolExpand alloc failed size = 9703424
[ERR]OsMemPoolExpand alloc failed size = 9703424
[ERR]OsMemPoolExpand alloc failed size = 9703424
[ERR]OsMemPoolExpand alloc failed size = 9703424
[ERR]OsMemPoolExpand alloc failed size = 9703424
[ERR]OsMemPoolExpand alloc failed size = 9703424
[ERR]OsMemPoolExpand alloc failed size = 9703424
[ERR]OsMemPoolExpand alloc failed size = 9703424
[ERR]OsMemPoolExpand alloc failed size = 9703424
[ERR]OsMemPoolExpand alloc failed size = 9703424
[ERR]OsMemPoolExpand alloc failed size = 9703424
[ERR]OsMemPoolExpand alloc failed size = 9703424
[ERR]OsMemPoolExpand alloc failed size = 9703424
[ERR]OsMemPoolExpand alloc failed size = 9703424
[ERR]OsMemPoolExpand alloc failed size = 9703424
[ERR]OsMemPoolExpand alloc failed size = 9703424
[ERR]OsMemPoolExpand alloc failed size = 9703424
[ERR]OsMemPoolExpand alloc failed size = 9703424
[ERR]OsMemPoolExpand alloc failed size = 9703424
[ERR]OsMemPoolExpand alloc failed size = 9703424
[ERR]OsMemPoolExpand alloc failed size = 9703424
[ERR]OsMemPoolExpand alloc failed size = 9703424
[ERR]OsMemPoolExpand alloc failed size = 9703424
[ERR]OsMemPoolExpand alloc failed size = 9703424
[ERR]OsMemPoolExpand alloc failed size = 9703424
[ERR]OsMemPoolExpand alloc failed size = 9703424
[ERR]OsMemPoolExpand alloc failed size = 9703424
[ERR]OsMemPoolExpand alloc failed size = 9703424
[ERR]OsMemPoolExpand alloc failed size = 9703424
[ERR]OsMemPoolExpand alloc failed size = 9703424
[ERR]OsMemPoolExpand alloc failed size = 9703424
[ERR]OsMemPoolExpand alloc failed size = 9703424
[ERR]OsMemPoolExpand alloc failed size = 9703424
[ERR]OsMemPoolExpand alloc failed size = 9703424
[ERR]OsMemPoolExpand alloc failed size = 9703424
[ERR]OsMemPoolExpand alloc failed size = 9703424
[ERR]OsMemPoolExpand alloc failed size = 9703424
[ERR]OsMemPoolExpand alloc failed size = 9703424
[ERR]OsMemPoolExpand alloc failed size = 9703424
[ERR]OsMemPoolExpand alloc failed size = 9703424
[ERR]OsMemPoolExpand alloc failed size = 9703424
[ERR]OsMemPoolExpand alloc failed size = 9703424
[ERR]OsMemPoolExpand alloc failed size = 9703424

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