diff --git a/testing/mozbase/mozlog/mozlog/structured/formatters/machformatter.py b/testing/mozbase/mozlog/mozlog/structured/formatters/machformatter.py
index f2d63a831a1..f9a02ee94a7 100644
--- a/testing/mozbase/mozlog/mozlog/structured/formatters/machformatter.py
+++ b/testing/mozbase/mozlog/mozlog/structured/formatters/machformatter.py
@@ -247,14 +247,9 @@ class MachFormatter(base.BaseFormatter):
                 level = self.terminal.blue(level)
 
         if data.get('component'):
-            rv = " ".join([data["component"], level, data["message"]])
-        else:
-            rv = "%s %s" % (level, message)
+            return " ".join([data["component"], level, data["message"]])
 
-        if "stack" in data:
-            rv += "\n%s" % data["stack"]
-
-        return rv
+        return "%s %s" % (level, data["message"])
 
     def _get_subtest_data(self, data):
         test = self._get_test_id(data)
diff --git a/testing/mozbase/mozlog/mozlog/structured/formatters/tbplformatter.py b/testing/mozbase/mozlog/mozlog/structured/formatters/tbplformatter.py
index 80027db9fd3..3d010e553e8 100644
--- a/testing/mozbase/mozlog/mozlog/structured/formatters/tbplformatter.py
+++ b/testing/mozbase/mozlog/mozlog/structured/formatters/tbplformatter.py
@@ -18,14 +18,9 @@ class TbplFormatter(BaseFormatter):
 
     def log(self, data):
         if data.get('component'):
-            message = "%s %s" % (data["component"], data["message"])
-        else:
-            message = data["message"]
+            return "%s %s\n" % (data["component"], data["message"])
 
-        if "stack" in data:
-            message += "\n%s" % data["stack"]
-
-        return "%s\n" % message
+        return "%s\n" % (data["message"])
 
     def process_output(self, data):
         return "PROCESS | %(process)s | %(data)s\n" % data
diff --git a/testing/mozbase/mozlog/mozlog/structured/logtypes.py b/testing/mozbase/mozlog/mozlog/structured/logtypes.py
index 0e7b7243198..f3f4846081b 100644
--- a/testing/mozbase/mozlog/mozlog/structured/logtypes.py
+++ b/testing/mozbase/mozlog/mozlog/structured/logtypes.py
@@ -165,7 +165,3 @@ class List(DataType):
 class Int(DataType):
     def convert(self, data):
         return int(data)
-
-class Any(DataType):
-    def convert(self, data):
-        return data
diff --git a/testing/mozbase/mozlog/mozlog/structured/structuredlog.py b/testing/mozbase/mozlog/mozlog/structured/structuredlog.py
index 411a1d2d2bf..0fe556c802e 100644
--- a/testing/mozbase/mozlog/mozlog/structured/structuredlog.py
+++ b/testing/mozbase/mozlog/mozlog/structured/structuredlog.py
@@ -7,11 +7,9 @@ from __future__ import unicode_literals
 from multiprocessing import current_process
 from threading import current_thread, Lock
 import json
-import sys
 import time
-import traceback
 
-from logtypes import Unicode, TestId, Status, SubStatus, Dict, List, Any, log_action, convertor_registry
+from logtypes import Unicode, TestId, Status, SubStatus, Dict, List, log_action, convertor_registry
 
 """Structured Logging for recording test results.
 
@@ -299,27 +297,14 @@ class StructuredLogger(object):
 
 
 def _log_func(level_name):
-    @log_action(Unicode("message"),
-                Any("exc_info", default=False))
+    @log_action(Unicode("message"))
     def log(self, data):
-        exc_info = data.pop("exc_info", None)
-        if exc_info:
-            if not isinstance(exc_info, tuple):
-                exc_info = sys.exc_info()
-            if exc_info != (None, None, None):
-                bt = traceback.format_exception(*exc_info)
-                data["stack"] = u"\n".join(bt)
-
         data["level"] = level_name
         self._log_data("log", data)
 
     log.__doc__ = """Log a message with level %s
 
 :param message: The string message to log
-:param exc_info: Either a boolean indicating whether to include a traceback
-                 derived from sys.exc_info() or a three-item tuple in the
-                 same format as sys.exc_info() containing exception information
-                 to log.
 """ % level_name
     log.__name__ = str(level_name).lower()
     return log