RTEMS Tools | rtems-test: Leaks pipes when using a gdb based simulator (#15)

[Joel Sherrill (@joel)]

Joel Sherrill created an issue: https://gitlab.rtems.org/rtems/tools/rtems-tools/-/issues/15



## Summary
When used with a gdb based simulator like psim, rtems-test uses multiple file descriptors -- one for gdb.cfg and multiple for pipes. On a server with 56 cores, I encountered the following failure:

`[572/675] p:491 f:5   u:6   e:22  I:0   B:3   t:0   L:0   i:0   W:0   | powerpc/psim: spsem_err02.exe
[564/675] p:491 f:5   u:6   e:22  I:0   B:3   t:0   L:0   i:0   W:0   | powerpc/psim: spregion_err01.exe
error: error opening config file: /home/joel/rtems-cron-6.1-rc4/tools/6/share/rtems/tester/rtems/version.cfg
`

The error opening the config file is because the process rtems-test has exceeded its allowed maximum of file descriptors. The following snippet is from watching lsof with the pid for rtems-test. We can see that gdb.cfg is open 52 times which seems reasonable give a 56 core machine. 

I did the rtems-test run in one terminal and the lsof commands in another. 


```
$ lsof -p 1232936 | grep gdb.cfg | wc -l
52
```

But the process has an increasing number of pipes open as the tests continue to execute.

```
[joel at gitlab ~]$ lsof -p 1232936 | grep pipe | wc -l
776
[joel at gitlab ~]$ lsof -p 1232936 | grep pipe | wc -l
819
[joel at gitlab ~]$ lsof -p 1232936 | grep pipe | wc -l
842
[joel at gitlab ~]$ lsof -p 1232936 | grep pipe | wc -l
943
[joel at gitlab ~]$ lsof -p 1232936 | grep pipe | wc -l
951
```

At ~55/675 tests, there are ~165 pipes in the lsof. At ~160/675 tests, there are ~300 pipes in the lsof. It continues to increase.

All go away when the rtems-test fails and exits.

The number of file descriptors open for rtems-test do **NOT** increase when using SIS.

## Steps to reproduce

You should be able to see the number of pipe file descriptors increase on any multi-core machine when using a gdb based simulator. But there must be some mechanism that is able to reclaim them that is able to run. It must not be happening in the higher core environment.

### Pre-set options

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View it on GitLab: https://gitlab.rtems.org/rtems/tools/rtems-tools/-/issues/15
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