One some platforms nm spits out some strange internal symbols called $t, $d...

tools/linux-tick-processor.py

Index: tools/linux-tick-processor.py
===================================================================
--- tools/linux-tick-processor.py	(revision 2216)
+++ tools/linux-tick-processor.py	(working copy)
@@ -47,9 +47,11 @@
         row = re.match('^([0-9a-fA-F]{8}) . (.*)$', line)
         if row:
           addr = int(row.group(1), 16)
+          name = row.group(2);
           if addr < start and addr < end - start:
             addr += start
-          self.cpp_entries.Insert(addr, tickprocessor.CodeEntry(addr, row.group(2)))
+          if not re.match('^\$[a-z]$', name):
+            self.cpp_entries.Insert(addr, tickprocessor.CodeEntry(addr, name))
     finally:
       pipe.close()