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[Bug runtime/12124] New: emit diagnostics on unwind errors


http://sourceware.org/bugzilla/show_bug.cgi?id=12124

           Summary: emit diagnostics on unwind errors
           Product: systemtap
           Version: unspecified
            Status: NEW
          Severity: normal
          Priority: P2
         Component: runtime
        AssignedTo: systemtap@sources.redhat.com
        ReportedBy: fche@redhat.com


Roland reports that the runtime/unwind* code catches a bunch
of errors, but does not give a hint to the user about them,
except via -DDEBUG_UNWIND and/or a smaller-than-expected
result array.

It should _stp_warn() instead, and could limit that to one
message per _stp_module and/or thread-id.

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