diff --git a/poky/bitbake/lib/bb/fetch2/__init__.py b/poky/bitbake/lib/bb/fetch2/__init__.py
index 3b8389e..709372e 100644
--- a/poky/bitbake/lib/bb/fetch2/__init__.py
+++ b/poky/bitbake/lib/bb/fetch2/__init__.py
@@ -1469,7 +1469,7 @@
                 else:
                     cmd = 'rpm2cpio.sh %s | cpio -id' % (file)
             elif file.endswith('.deb') or file.endswith('.ipk'):
-                output = subprocess.check_output('ar -t %s' % file, preexec_fn=subprocess_setup, shell=True)
+                output = subprocess.check_output(['ar', '-t', file], preexec_fn=subprocess_setup)
                 datafile = None
                 if output:
                     for line in output.decode().splitlines():
diff --git a/poky/bitbake/lib/bb/server/process.py b/poky/bitbake/lib/bb/server/process.py
index 42d7907..070da4f 100644
--- a/poky/bitbake/lib/bb/server/process.py
+++ b/poky/bitbake/lib/bb/server/process.py
@@ -239,6 +239,12 @@
         while not lock:
             with bb.utils.timeout(3):
                 lock = bb.utils.lockfile(lockfile, shared=False, retry=False, block=True)
+                if lock:
+                    # We hold the lock so we can remove the file (hide stale pid data)
+                    bb.utils.remove(lockfile)
+                    bb.utils.unlockfile(lock)
+                    return
+
                 if not lock:
                     # Some systems may not have lsof available
                     procs = None
@@ -259,10 +265,6 @@
                     if procs:
                         msg += ":\n%s" % str(procs)
                     print(msg)
-                    return
-        # We hold the lock so we can remove the file (hide stale pid data)
-        bb.utils.remove(lockfile)
-        bb.utils.unlockfile(lock)
 
     def idle_commands(self, delay, fds=None):
         nextsleep = delay
@@ -412,23 +414,33 @@
                 logstart_re = re.compile(self.start_log_format % ('([0-9]+)', '([0-9-]+ [0-9:.]+)'))
                 started = False
                 lines = []
+                lastlines = []
                 with open(logfile, "r") as f:
                     for line in f:
                         if started:
                             lines.append(line)
                         else:
+                            lastlines.append(line)
                             res = logstart_re.match(line.rstrip())
                             if res:
                                 ldatetime = datetime.datetime.strptime(res.group(2), self.start_log_datetime_format)
                                 if ldatetime >= startdatetime:
                                     started = True
                                     lines.append(line)
+                        if len(lastlines) > 60:
+                            lastlines = lastlines[-60:]
                 if lines:
-                    if len(lines) > 10:
-                        bb.error("Last 10 lines of server log for this session (%s):\n%s" % (logfile, "".join(lines[-10:])))
+                    if len(lines) > 60:
+                        bb.error("Last 60 lines of server log for this session (%s):\n%s" % (logfile, "".join(lines[-60:])))
                     else:
                         bb.error("Server log for this session (%s):\n%s" % (logfile, "".join(lines)))
+                elif lastlines:
+                        bb.error("Server didn't start, last 60 loglines (%s):\n%s" % (logfile, "".join(lastlines)))
+            else:
+                bb.error("%s doesn't exist" % logfile)
+
             raise SystemExit(1)
+
         ready.close()
 
     def _startServer(self):
diff --git a/poky/bitbake/lib/bblayers/layerindex.py b/poky/bitbake/lib/bblayers/layerindex.py
index 9f02a9d..b2ff226 100644
--- a/poky/bitbake/lib/bblayers/layerindex.py
+++ b/poky/bitbake/lib/bblayers/layerindex.py
@@ -28,7 +28,7 @@
         layerdir = os.path.join(repodir, subdir)
         if not os.path.exists(repodir):
             if fetch_layer:
-                result = subprocess.call('git clone %s %s' % (url, repodir), shell = True)
+                result = subprocess.call(['git', 'clone', url, repodir])
                 if result:
                     logger.error("Failed to download %s" % url)
                     return None, None, None