diff --git a/poky/meta/lib/oe/patch.py b/poky/meta/lib/oe/patch.py
index 7dd31d9..f43cf04 100644
--- a/poky/meta/lib/oe/patch.py
+++ b/poky/meta/lib/oe/patch.py
@@ -38,21 +38,10 @@
         if exitstatus != 0:
             raise CmdError(cmd, exitstatus >> 8, output)
         if " fuzz " in output:
-            bb.warn("""
-Some of the context lines in patches were ignored. This can lead to incorrectly applied patches.
-The context lines in the patches can be updated with devtool:
+            # Drop patch fuzz info with header and footer to log file so
+            # insane.bbclass can handle to throw error/warning
+            bb.note("--- Patch fuzz start ---\n%s\n--- Patch fuzz end ---" % format(output))
 
-    devtool modify <recipe>
-    devtool finish --force-patch-refresh <recipe> <layer_path>
-
-Then the updated patches and the source tree (in devtool's workspace)
-should be reviewed to make sure the patches apply in the correct place
-and don't introduce duplicate lines (which can, and does happen
-when some of the context is ignored). Further information:
-http://lists.openembedded.org/pipermail/openembedded-core/2018-March/148675.html
-https://bugzilla.yoctoproject.org/show_bug.cgi?id=10450
-Details:
-{}""".format(output))
         return output
 
     finally:
diff --git a/poky/meta/lib/oe/utils.py b/poky/meta/lib/oe/utils.py
index cedd053..a4fd79c 100644
--- a/poky/meta/lib/oe/utils.py
+++ b/poky/meta/lib/oe/utils.py
@@ -78,12 +78,12 @@
     # See if var ends with any of the suffixes listed and
     # remove it if found
     for suffix in suffixes:
-        if var.endswith(suffix):
-            var = var.replace(suffix, "")
+        if suffix and var.endswith(suffix):
+            var = var[:-len(suffix)]
 
     prefix = d.getVar("MLPREFIX")
     if prefix and var.startswith(prefix):
-        var = var.replace(prefix, "")
+        var = var[len(prefix):]
 
     return var
 
diff --git a/poky/meta/lib/oeqa/utils/qemurunner.py b/poky/meta/lib/oeqa/utils/qemurunner.py
index 49020c1..1abb2c1 100644
--- a/poky/meta/lib/oeqa/utils/qemurunner.py
+++ b/poky/meta/lib/oeqa/utils/qemurunner.py
@@ -329,7 +329,7 @@
                 self.logger.debug("Target didn't reach login banner in %d seconds (%s)" %
                                   (self.boottime, time.strftime("%D %H:%M:%S")))
             tail = lambda l: "\n".join(l.splitlines()[-25:])
-            bootlog = boolog.decode("utf-8")
+            bootlog = bootlog.decode("utf-8")
             # in case bootlog is empty, use tail qemu log store at self.msg
             lines = tail(bootlog if bootlog else self.msg)
             self.logger.debug("Last 25 lines of text:\n%s" % lines)