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Created attachment 474525 [details]
cmdlinefail.stp

Description of problem:
In tapset context.stp, cmdline_args won't return data after the first NULL argument.

Version-Release number of selected component (if applicable):
systemtap-1.2-9.el6.x86_64


How reproducible:
100%

Steps to Reproduce:
1. stap cmdlinefail.stp   (see attached file)
2. In a separate window, execute: /bin/ls "" additional arguments
3. Look at stap output
  
Actual results:
stap displays: /bin/ls

Expected results:
stap displays: /bin/ls ^@ additional arguments
Note, that instead of ^@, it could display something else, or even nothing, but it should display the additional arguments.

Additional info:

Created attachment 474528 [details]
Proposed patch

I attached a suggested fix.

upstream commit 5e3f644

    Technical note added. If any revisions are required, please edit the "Technical Notes" field
    accordingly. All revisions will be proofread by the Engineering Content Services team.
    
    New Contents:
Cause
    The cmdline_string() function used to concatenate commandline arguments
    would abort the concatenation when it encountered a NULL pointer for an
    argument.
Consequence
    The cmdline_string() function would not print any arguments following
    a null argument.
Fix
    The cmdline_string() function insert "" for empty string.
Result
    The cmdline_args() function now prints all arguments from the command
    line including ones that follow a NULL argument.

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

http://rhn.redhat.com/errata/RHBA-2011-1517.html