[Bug runtime/13209] New: ubacktrace functions should only rely on vma tracker

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

http://sourceware.org/bugzilla/show_bug.cgi?id=13209

             Bug #: 13209
           Summary: ubacktrace functions should only rely on vma tracker
           Product: systemtap
           Version: unspecified
            Status: NEW
          Severity: normal
          Priority: P2
         Component: runtime
        AssignedTo: systemtap@sourceware.org
        ReportedBy: mjw@redhat.com
    Classification: Unclassified


The current ubacktrace functions from tapset/ucontext-unwind.stp rely on both
/* pragma:vma */ and /* pragma:uprobes */ there are two issues with that.

1) Just relying on /* pragma:vma */ doesn't trigger the UTRACE check, so you
might accidentially use a function that needs the task finder vma tracker which
currently doesn't start (might be solved by taskfinder2 work, which shouldn't
rely on utrace).

2) ubacktrace doesn't actually need uprobes, it can unwind perfectly fine
without it. Except that IF uprobes is available it wants to use the
uprobe_get_pc() function to get around uretprobes. So the dependency is
inverted.

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