Add: Backtrace output when a sigsegv occurs.

When a sigsegv occurs in gvmd, a backtrace is now written to the logfile
if the appropriate log levels are set.

Merge pull request #1750 from jhelmold/print_backtrace_on_signal

src/gvmd.c

@@ -1003,7 +1003,7 @@ handle_sigabrt (int given_signal)
       frame_count = 0;
     }
   for (index = 0; index < frame_count; index++)
-    g_debug ("%s", frames_text[index]);
+    g_debug ("BACKTRACE: %s", frames_text[index]);
   free (frames_text);
 #endif
 
@@ -1035,6 +1035,24 @@ handle_termination_signal (int signal)
 static void
 handle_sigsegv (/* unused */ int given_signal)
 {
+#ifndef NDEBUG
+  void *frames[BA_SIZE];
+  int frame_count, index;
+  char **frames_text;
+
+  /* Print a backtrace. */
+  frame_count = backtrace (frames, BA_SIZE);
+  frames_text = backtrace_symbols (frames, frame_count);
+  if (frames_text == NULL)
+    {
+      perror ("backtrace symbols");
+      frame_count = 0;
+    }
+  for (index = 0; index < frame_count; index++)
+    g_debug ("BACKTRACE: %s", frames_text[index]);
+  free (frames_text);
+#endif
+
   manage_cleanup_process_error (given_signal);
 
   /* This previously called "cleanup", but it seems that the regular manager