[Bug dyninst/23605] New: Intermittent errors when running a simplest stap script against a simplest target program

[agentzh at gmail dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=23605

            Bug ID: 23605
           Summary: Intermittent errors when running a simplest stap
                    script against a simplest target program
           Product: systemtap
           Version: unspecified
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: dyninst
          Assignee: systemtap at sourceware dot org
          Reporter: agentzh at gmail dot com
  Target Milestone: ---

When running a trivial stap script against a trivial C program process, I
occasionally see the following error:

```
$ stap --runtime=dyninst -c ./a.out a.stp
IRPC on terminated process, ret false!
--SERIOUS-- #124: `�3<�^?
stapdyn: ERROR: Couldn't load
/tmp/stapsBBcUd/stap_c7fd539785fa2c0bcc7ddfb6321bcd6f_1605.so into the target
process
WARNING: /opt/stap-plus/bin/stapdyn exited with status: 1
Pass 5: run failed.  [man error::pass5]
```

The a.stp file looks like this:

```
probe process.function("main") {
    println(@var("a"));
}
```

And the C program is like this:

```
int a = -32;

int main(void) { a++; return 0; }
```

The C program is compiled with `gcc -g`.

What could go wrong here please?

I'm not Fedora 27 x86_64 (kernel 4.16.16):

```
$ uname -r
4.16.16-200.fc27.x86_64
```

I'm using the current master branch of systemtap.

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