[Bug tapsets/16616] New: the 'servername' convenience variable returned by the rpc tapset can be NULL

["dsmith at redhat dot com" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=16616

            Bug ID: 16616
           Summary: the 'servername' convenience variable returned by the
                    rpc tapset can be NULL
           Product: systemtap
           Version: unspecified
            Status: NEW
          Severity: normal
          Priority: P2
         Component: tapsets
          Assignee: systemtap at sourceware dot org
          Reporter: dsmith at redhat dot com

The 'servername' convenience variable returned by the rpc tapset can be NULL.
This causes the following systemtap error:

====
ERROR: kernel string copy fault at 0x          (null) near identifier
'kernel_string' at /usr/share/systemtap/tapset/linux/conversions.stp:18:10
====

>From some debugging, it looks like that sometimes the the underlying kernel
variable is just NULL. Systemtap giving an error there is somewhat correct,
since the value *is* NULL.

However, there is some code in rpc_create() that if it finds a NULL servername,
it creates a string representation of the passed-in address, and uses that for
the servername. Systemtap could try to duplicate that logic.

(And what is up with all the extra space in that '0x          (null)' string?)

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