diff --git a/poky/bitbake/lib/bb/build.py b/poky/bitbake/lib/bb/build.py
index 6ce8f1e..7e4ab9f 100644
--- a/poky/bitbake/lib/bb/build.py
+++ b/poky/bitbake/lib/bb/build.py
@@ -295,9 +295,13 @@
         lineno = int(d.getVarFlag(func, "lineno", False))
         bb.methodpool.insert_method(func, text, fn, lineno - 1)
 
-        comp = utils.better_compile(code, func, "exec_python_func() autogenerated")
-        utils.better_exec(comp, {"d": d}, code, "exec_python_func() autogenerated")
+        comp = utils.better_compile(code, func, "exec_func_python() autogenerated")
+        utils.better_exec(comp, {"d": d}, code, "exec_func_python() autogenerated")
     finally:
+        # We want any stdout/stderr to be printed before any other log messages to make debugging
+        # more accurate. In some cases we seem to lose stdout/stderr entirely in logging tests without this.
+        sys.stdout.flush()
+        sys.stderr.flush()
         bb.debug(2, "Python function %s finished" % func)
 
         if cwd and olddir:
@@ -682,47 +686,51 @@
     try:
         try:
             event.fire(TaskStarted(task, fn, logfn, flags, localdata), localdata)
-        except (bb.BBHandledException, SystemExit):
-            return 1
 
-        try:
             for func in (prefuncs or '').split():
                 exec_func(func, localdata)
             exec_func(task, localdata)
             for func in (postfuncs or '').split():
                 exec_func(func, localdata)
-        except bb.BBHandledException:
-            event.fire(TaskFailed(task, fn, logfn, localdata, True), localdata)
-            return 1
-        except Exception as exc:
-            if quieterr:
-                event.fire(TaskFailedSilent(task, fn, logfn, localdata), localdata)
-            else:
-                errprinted = errchk.triggered
-                logger.error(str(exc))
-                event.fire(TaskFailed(task, fn, logfn, localdata, errprinted), localdata)
-            return 1
-    finally:
-        sys.stdout.flush()
-        sys.stderr.flush()
+        finally:
+            # Need to flush and close the logs before sending events where the
+            # UI may try to look at the logs.
+            sys.stdout.flush()
+            sys.stderr.flush()
 
-        bblogger.removeHandler(handler)
+            bblogger.removeHandler(handler)
 
-        # Restore the backup fds
-        os.dup2(osi[0], osi[1])
-        os.dup2(oso[0], oso[1])
-        os.dup2(ose[0], ose[1])
+            # Restore the backup fds
+            os.dup2(osi[0], osi[1])
+            os.dup2(oso[0], oso[1])
+            os.dup2(ose[0], ose[1])
 
-        # Close the backup fds
-        os.close(osi[0])
-        os.close(oso[0])
-        os.close(ose[0])
+            # Close the backup fds
+            os.close(osi[0])
+            os.close(oso[0])
+            os.close(ose[0])
 
-        logfile.close()
-        if os.path.exists(logfn) and os.path.getsize(logfn) == 0:
-            logger.debug2("Zero size logfn %s, removing", logfn)
-            bb.utils.remove(logfn)
-            bb.utils.remove(loglink)
+            logfile.close()
+            if os.path.exists(logfn) and os.path.getsize(logfn) == 0:
+                logger.debug2("Zero size logfn %s, removing", logfn)
+                bb.utils.remove(logfn)
+                bb.utils.remove(loglink)
+    except bb.BBHandledException:
+        event.fire(TaskFailed(task, fn, logfn, localdata, True), localdata)
+        return 1
+    except (Exception, SystemExit) as exc:
+        if quieterr:
+            event.fire(TaskFailedSilent(task, fn, logfn, localdata), localdata)
+        else:
+            errprinted = errchk.triggered
+            # If the output is already on stdout, we've printed the information in the
+            # logs once already so don't duplicate
+            if verboseStdoutLogging:
+                errprinted = True
+            logger.error(repr(exc))
+            event.fire(TaskFailed(task, fn, logfn, localdata, errprinted), localdata)
+        return 1
+
     event.fire(TaskSucceeded(task, fn, logfn, localdata), localdata)
 
     if not localdata.getVarFlag(task, 'nostamp', False) and not localdata.getVarFlag(task, 'selfstamp', False):
@@ -1030,6 +1038,8 @@
     def follow_chain(task, endtask, chain=None):
         if not chain:
             chain = []
+        if task in chain:
+            bb.fatal("Circular task dependencies as %s depends on itself via the chain %s" % (task, " -> ".join(chain)))
         chain.append(task)
         for othertask in tasks:
             if othertask == task: