[Bug runtime/15024] New: task_finder_vma should not need "stap -d PROGRAM" just to poke at shlib globals with _stp_umodule_relocate()

[fche at redhat dot com]

http://sourceware.org/bugzilla/show_bug.cgi?id=15024

             Bug #: 15024
           Summary: task_finder_vma should not need "stap -d PROGRAM" just
                    to poke at shlib globals with _stp_umodule_relocate()
           Product: systemtap
           Version: unspecified
            Status: NEW
          Severity: normal
          Priority: P2
         Component: runtime
        AssignedTo: systemtap@sourceware.org
        ReportedBy: fche@redhat.com
    Classification: Unclassified


Within the new threadstacks.stp sample script, a shlib global variable is
accessed from a shlib probe.  However, the task-finder does not appear to make
the shlib data available for _stp_umodule_relocate *unless* the stap script was
invoked with -d A.OUT, referring to the main program (that links in the shlib).
 This should not be necessary.

% gcc -g -pthread .../pthread_stacks.c

% sudo stap -g  .../threadstacks.stp -Gsize=65536 -c './a.out 10 0'   
stacksize=2101248
ERROR: kernel read fault at 0x(null) (addr) near identifier
'$__default_stacksize' at .../threadstacks.stp:18:16
WARNING: Number of errors: 1, skipped probes: 0
WARNING: /usr/bin/staprun exited with status: 1
Pass 5: run failed.  Try again with another '--vp 00001' option.

% sudo stap -g  .../threadstacks.stp -Gsize=65536 -c './a.out 10 0' -d a.out
stacksize=69632
a.out[31621] overwrote __default_stacksize@0x3fab61c350 (2097152->65536)

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