diff --git a/changelog/3630.bugfix.rst b/changelog/3630.bugfix.rst
new file mode 100644
index 000000000..505bcb8fd
--- /dev/null
+++ b/changelog/3630.bugfix.rst
@@ -0,0 +1 @@
+Log messages with unicode characters would not appear in the output log file.
diff --git a/changelog/3631.bugfix.rst b/changelog/3631.bugfix.rst
new file mode 100644
index 000000000..261c41ccd
--- /dev/null
+++ b/changelog/3631.bugfix.rst
@@ -0,0 +1 @@
+No longer raise AttributeError when legacy marks can't be stored.
diff --git a/src/_pytest/logging.py b/src/_pytest/logging.py
index 70b6592c4..ae1a80c50 100644
--- a/src/_pytest/logging.py
+++ b/src/_pytest/logging.py
@@ -392,7 +392,9 @@ class LoggingPlugin(object):
                 config, "log_file_date_format", "log_date_format"
             )
             # Each pytest runtests session will write to a clean logfile
-            self.log_file_handler = logging.FileHandler(log_file, mode="w")
+            self.log_file_handler = logging.FileHandler(
+                log_file, mode="w", encoding="UTF-8"
+            )
             log_file_formatter = logging.Formatter(
                 log_file_format, datefmt=log_file_date_format
             )
diff --git a/src/_pytest/mark/structures.py b/src/_pytest/mark/structures.py
index d416e422b..3fb15bbc2 100644
--- a/src/_pytest/mark/structures.py
+++ b/src/_pytest/mark/structures.py
@@ -259,7 +259,7 @@ def store_legacy_markinfo(func, mark):
     if holder is None:
         holder = MarkInfo.for_mark(mark)
         setattr(func, mark.name, holder)
-    else:
+    elif isinstance(holder, MarkInfo):
         holder.add_mark(mark)
 
 
diff --git a/src/_pytest/monkeypatch.py b/src/_pytest/monkeypatch.py
index e6928f96b..22ffffd4c 100644
--- a/src/_pytest/monkeypatch.py
+++ b/src/_pytest/monkeypatch.py
@@ -22,7 +22,7 @@ def monkeypatch():
         monkeypatch.setitem(mapping, name, value)
         monkeypatch.delitem(obj, name, raising=True)
         monkeypatch.setenv(name, value, prepend=False)
-        monkeypatch.delenv(name, value, raising=True)
+        monkeypatch.delenv(name, raising=True)
         monkeypatch.syspath_prepend(path)
         monkeypatch.chdir(path)
 
diff --git a/testing/logging/test_reporting.py b/testing/logging/test_reporting.py
index 0a8a58506..07c092191 100644
--- a/testing/logging/test_reporting.py
+++ b/testing/logging/test_reporting.py
@@ -1,6 +1,7 @@
 # -*- coding: utf-8 -*-
 import re
 import os
+from io import open
 
 import six
 
@@ -827,6 +828,43 @@ def test_log_file_ini_level(testdir):
         assert "This log message won't be shown" not in contents
 
 
+def test_log_file_unicode(testdir):
+    log_file = testdir.tmpdir.join("pytest.log").strpath
+
+    testdir.makeini(
+        """
+        [pytest]
+        log_file={}
+        log_file_level = INFO
+        """.format(
+            log_file
+        )
+    )
+    testdir.makepyfile(
+        """
+        # -*- coding: utf-8 -*-
+        from __future__ import unicode_literals
+        import logging
+
+        def test_log_file():
+            logging.getLogger('catchlog').info("Normal message")
+            logging.getLogger('catchlog').info("├")
+            logging.getLogger('catchlog').info("Another normal message")
+    """
+    )
+
+    result = testdir.runpytest()
+
+    # make sure that that we get a '0' exit code for the testsuite
+    assert result.ret == 0
+    assert os.path.isfile(log_file)
+    with open(log_file, encoding="utf-8") as rfh:
+        contents = rfh.read()
+        assert "Normal message" in contents
+        assert u"├" in contents
+        assert "Another normal message" in contents
+
+
 @pytest.mark.parametrize("has_capture_manager", [True, False])
 def test_live_logging_suspends_capture(has_capture_manager, request):
     """Test that capture manager is suspended when we emitting messages for live logging.
diff --git a/testing/test_mark.py b/testing/test_mark.py
index f87a4eded..e3d28189c 100644
--- a/testing/test_mark.py
+++ b/testing/test_mark.py
@@ -63,6 +63,19 @@ class TestMark(object):
         mark.hello(f)
         assert f.hello
 
+    def test_mark_legacy_ignore_fail(self):
+        def add_attribute(func):
+            func.foo = 1
+            return func
+
+        @pytest.mark.foo
+        @add_attribute
+        def test_fun():
+            pass
+
+        assert test_fun.foo == 1
+        assert test_fun.pytestmark
+
     @ignore_markinfo
     def test_pytest_mark_keywords(self):
         mark = Mark()