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From: "adrian.m.negreanu at intel dot com" <sourceware-bugzilla@sourceware.org>
To: systemtap@sourceware.org
Subject: [Bug runtime/14026] New: print_ubacktrace doesn't resolve the symbol name
Date: Fri, 27 Apr 2012 10:00:00 -0000
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http://sourceware.org/bugzilla/show_bug.cgi?id=14026

             Bug #: 14026
           Summary: print_ubacktrace doesn't resolve the symbol name
           Product: systemtap
           Version: unspecified
            Status: NEW
          Severity: normal
          Priority: P2
         Component: runtime
        AssignedTo: systemtap@sourceware.org
        ReportedBy: adrian.m.negreanu@intel.com
    Classification: Unclassified


Created attachment 6372
  --> http://sourceware.org/bugzilla/attachment.cgi?id=6372
readelf -a on the debug file

On an android x86 target, I'm trying this script:

probe process("/system/bin/mksh").function("chvt_reinit") {
        printf("%s: pid=%d\n", module_name(), pid());
        printf("%s: ", module_name());
        print_regs();
        print_ubacktrace();
        printf("%s: DONE\n",module_name());
}

The backtrace consists of only addresses.
I attached the output of stap + staprun,
readelf -a on the target executable and
 of its .gnu_debuglink
and also the "readelf -debug-dump=frames target_executable".

One thing I noticed while trying to get more insight of what's happening,
was that if I define UNW_PC_FROM_RA to be 1, in -debug-dump=frames
the symbol is resolved but unwind() will only unwind the topmost frame.

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