Index: libbactrace/xcoff.c
===================================================================
--- a/libbacktrace/xcoff.c	(revision 272000)
+++ b/libbacktrace/xcoff.c	(working copy)
@@ -617,12 +617,15 @@ xcoff_initialize_syminfo (struct backtrace_state *
       const b_xcoff_syment *asym = &syms[i];
       if ((asym->n_sclass == C_EXT || asym->n_sclass == C_HIDEXT
 	    || asym->n_sclass == C_WEAKEXT)
-	  && ISFCN (asym->n_type) && asym->n_numaux > 0 && asym->n_scnum > 0)
+	  && ISFCN (asym->n_type) && asym->n_numaux > 1 && asym->n_scnum > 0)
 	++xcoff_symbol_count;
 
       i += asym->n_numaux;
     }
 
+  if (!xcoff_symbol_count)
+	  return 0;
+
   xcoff_symbol_size = xcoff_symbol_count * sizeof (struct xcoff_symbol);
   xcoff_symbols = ((struct xcoff_symbol *)
 		   backtrace_alloc (state, xcoff_symbol_size, error_callback,
@@ -636,7 +639,7 @@ xcoff_initialize_syminfo (struct backtrace_state *
       const b_xcoff_syment *asym = &syms[i];
       if ((asym->n_sclass == C_EXT || asym->n_sclass == C_HIDEXT
 	    || asym->n_sclass == C_WEAKEXT)
-	  && ISFCN (asym->n_type) && asym->n_numaux > 0 && asym->n_scnum > 0)
+	  && ISFCN (asym->n_type) && asym->n_numaux > 1 && asym->n_scnum > 0)
 	{
 	  const b_xcoff_auxent *aux = (const b_xcoff_auxent *) (asym + 1);
 	  xcoff_symbols[j].name = xcoff_symname (asym, strtab, strtab_size);
@@ -972,7 +975,7 @@ xcoff_initialize_fileline (struct backtrace_state
 	    fsym = NULL;
 	    lnnoptr = 0;
 	    fsize = 0;
-	    if (!ISFCN (asym->n_type) || asym->n_numaux == 0
+	    if (!ISFCN (asym->n_type) || asym->n_numaux < 2
 		|| asym->n_scnum <= 0)
 	      break;
 	    if (filename == NULL)