[Bug runtime/23813] New: Make "too many pending warnings" more helpful

["agentzh at gmail dot com" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=23813

            Bug ID: 23813
           Summary: Make "too many pending warnings" more helpful
           Product: systemtap
           Version: unspecified
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: runtime
          Assignee: systemtap at sourceware dot org
          Reporter: agentzh at gmail dot com
  Target Milestone: ---

Some times we only get something like below from stap:

```
WARNING: too many pending (warning) messages
ERROR: too many pending (error) messages
WARNING: /opt/stap-plus/bin/staprun exited with status: 1
Pass 5: run failed.  [man error::pass5]
```

It's not helpful at all since we have no idea what messages are actually
flooding the control message buffers.

We should make stap output the first few and also the last few messages in the
current control buffer when it thinks that there are "too many". Otherwise
there is no way to debug things here.

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