diff --git a/poky/bitbake/README b/poky/bitbake/README
index 479c376..96e6007 100644
--- a/poky/bitbake/README
+++ b/poky/bitbake/README
@@ -11,7 +11,7 @@
 
 Bitbake plain documentation can be found under the doc directory or its integrated
 html version at the Yocto Project website:
-    http://yoctoproject.org/documentation
+    https://docs.yoctoproject.org
 
 Contributing
 ------------
diff --git a/poky/bitbake/doc/bitbake-user-manual/bitbake-user-manual-execution.rst b/poky/bitbake/doc/bitbake-user-manual/bitbake-user-manual-execution.rst
index d74e768..56abf77 100644
--- a/poky/bitbake/doc/bitbake-user-manual/bitbake-user-manual-execution.rst
+++ b/poky/bitbake/doc/bitbake-user-manual/bitbake-user-manual-execution.rst
@@ -244,7 +244,8 @@
   BBFILE_COLLECTIONS = "upstream local"
   BBFILE_PATTERN_upstream = "^/stuff/openembedded/"
   BBFILE_PATTERN_local = "^/stuff/openembedded.modified/"
-  BBFILE_PRIORITY_upstream = "5" BBFILE_PRIORITY_local = "10"
+  BBFILE_PRIORITY_upstream = "5"
+  BBFILE_PRIORITY_local = "10"
 
 .. note::
 
diff --git a/poky/bitbake/doc/bitbake-user-manual/bitbake-user-manual-fetching.rst b/poky/bitbake/doc/bitbake-user-manual/bitbake-user-manual-fetching.rst
index 6760b10..e9a5f33 100644
--- a/poky/bitbake/doc/bitbake-user-manual/bitbake-user-manual-fetching.rst
+++ b/poky/bitbake/doc/bitbake-user-manual/bitbake-user-manual-fetching.rst
@@ -624,6 +624,34 @@
    SRC_URI = "repo://REPOROOT;protocol=git;branch=some_branch;manifest=my_manifest.xml"
    SRC_URI = "repo://REPOROOT;protocol=file;branch=some_branch;manifest=my_manifest.xml"
 
+.. _az-fetcher:
+
+Az Fetcher (``az://``)
+--------------------------
+
+This submodule fetches data from an
+`Azure Storage account <https://docs.microsoft.com/en-us/azure/storage/>`__ ,
+it inherits its functionality from the HTTP wget fetcher, but modifies its
+behavior to accomodate the usage of a
+`Shared Access Signature (SAS) <https://docs.microsoft.com/en-us/azure/storage/common/storage-sas-overview>`__
+for non-public data.
+
+Such functionality is set by the variable:
+
+-  :term:`AZ_SAS`: The Azure Storage Shared Access Signature provides secure
+   delegate access to resources, if this variable is set, the Az Fetcher will
+   use it when fetching artifacts from the cloud.
+
+You can specify the AZ_SAS variable as shown below: ::
+
+   AZ_SAS = "se=2021-01-01&sp=r&sv=2018-11-09&sr=c&skoid=<skoid>&sig=<signature>"
+
+Here is an example URL: ::
+
+   SRC_URI = "az://<azure-storage-account>.blob.core.windows.net/<foo_container>/<bar_file>"
+
+It can also be used when setting mirrors definitions using the :term:`PREMIRRORS` variable.
+
 Other Fetchers
 --------------
 
diff --git a/poky/bitbake/doc/bitbake-user-manual/bitbake-user-manual-metadata.rst b/poky/bitbake/doc/bitbake-user-manual/bitbake-user-manual-metadata.rst
index 7ea68ad..d4190c2 100644
--- a/poky/bitbake/doc/bitbake-user-manual/bitbake-user-manual-metadata.rst
+++ b/poky/bitbake/doc/bitbake-user-manual/bitbake-user-manual-metadata.rst
@@ -1296,6 +1296,17 @@
 See the ":ref:`bitbake-user-manual/bitbake-user-manual-metadata:variable flags`" section for information
 on variable flags you can use with tasks.
 
+.. note::
+
+   While it's infrequent, it's possible to define multiple tasks as
+   dependencies when calling ``addtask``. For example, here's a snippet
+   from the OpenEmbedded class file ``package_tar.bbclass``::
+
+     addtask package_write_tar before do_build after do_packagedata do_package
+
+   Note how the ``package_write_tar`` task has to wait until both of
+   ``do_packagedata`` and ``do_package`` complete.
+
 Deleting a Task
 ---------------
 
@@ -1569,7 +1580,7 @@
    events when each of the workers parse the base configuration or if
    the server changes configuration and reparses. Any given datastore
    only has one such event executed against it, however. If
-   ```BB_INVALIDCONF`` <#>`__ is set in the datastore by the event
+   :term:`BB_INVALIDCONF` is set in the datastore by the event
    handler, the configuration is reparsed and a new event triggered,
    allowing the metadata to update configuration.
 
diff --git a/poky/bitbake/doc/bitbake-user-manual/bitbake-user-manual-ref-variables.rst b/poky/bitbake/doc/bitbake-user-manual/bitbake-user-manual-ref-variables.rst
index 6469f9d..1528b04 100644
--- a/poky/bitbake/doc/bitbake-user-manual/bitbake-user-manual-ref-variables.rst
+++ b/poky/bitbake/doc/bitbake-user-manual/bitbake-user-manual-ref-variables.rst
@@ -39,6 +39,19 @@
       when specified allows for the Git binary from the host to be used
       rather than building ``git-native``.
 
+   :term:`AZ_SAS`
+      Azure Storage Shared Access Signature, when using the
+      :ref:`Azure Storage fetcher <bitbake-user-manual/bitbake-user-manual-fetching:fetchers>`
+      This variable can be defined to be used by the fetcher to authenticate
+      and gain access to non-public artifacts.
+      ::
+
+         AZ_SAS = ""se=2021-01-01&sp=r&sv=2018-11-09&sr=c&skoid=<skoid>&sig=<signature>""
+
+      For more information see Microsoft's Azure Storage documentation at
+      https://docs.microsoft.com/en-us/azure/storage/common/storage-sas-overview
+
+
    :term:`B`
       The directory in which BitBake executes functions during a recipe's
       build process.
@@ -257,45 +270,6 @@
       ``my-recipe.bb`` is executing, the ``BB_FILENAME`` variable contains
       "/foo/path/my-recipe.bb".
 
-   :term:`BBFILES_DYNAMIC`
-      Activates content depending on presence of identified layers.  You
-      identify the layers by the collections that the layers define.
-
-      Use the ``BBFILES_DYNAMIC`` variable to avoid ``.bbappend`` files whose
-      corresponding ``.bb`` file is in a layer that attempts to modify other
-      layers through ``.bbappend`` but does not want to introduce a hard
-      dependency on those other layers.
-
-      Additionally you can prefix the rule with "!" to add ``.bbappend`` and
-      ``.bb`` files in case a layer is not present.  Use this avoid hard
-      dependency on those other layers.
-
-      Use the following form for ``BBFILES_DYNAMIC``: ::
-
-         collection_name:filename_pattern
-
-      The following example identifies two collection names and two filename
-      patterns: ::
-
-         BBFILES_DYNAMIC += "\
-             clang-layer:${LAYERDIR}/bbappends/meta-clang/*/*/*.bbappend \
-             core:${LAYERDIR}/bbappends/openembedded-core/meta/*/*/*.bbappend \
-         "
-
-      When the collection name is prefixed with "!" it will add the file pattern in case
-      the layer is absent: ::
-
-         BBFILES_DYNAMIC += "\
-             !clang-layer:${LAYERDIR}/backfill/meta-clang/*/*/*.bb \
-         "
-
-      This next example shows an error message that occurs because invalid
-      entries are found, which cause parsing to abort: ::
-
-         ERROR: BBFILES_DYNAMIC entries must be of the form {!}<collection name>:<filename pattern>, not:
-         /work/my-layer/bbappends/meta-security-isafw/*/*/*.bbappend
-         /work/my-layer/bbappends/openembedded-core/meta/*/*/*.bbappend
-
    :term:`BB_GENERATE_MIRROR_TARBALLS`
       Causes tarballs of the Git repositories, including the Git metadata,
       to be placed in the :term:`DL_DIR` directory. Anyone
@@ -671,6 +645,45 @@
       For details on the syntax, see the documentation by following the
       previous link.
 
+   :term:`BBFILES_DYNAMIC`
+      Activates content depending on presence of identified layers.  You
+      identify the layers by the collections that the layers define.
+
+      Use the ``BBFILES_DYNAMIC`` variable to avoid ``.bbappend`` files whose
+      corresponding ``.bb`` file is in a layer that attempts to modify other
+      layers through ``.bbappend`` but does not want to introduce a hard
+      dependency on those other layers.
+
+      Additionally you can prefix the rule with "!" to add ``.bbappend`` and
+      ``.bb`` files in case a layer is not present.  Use this avoid hard
+      dependency on those other layers.
+
+      Use the following form for ``BBFILES_DYNAMIC``: ::
+
+         collection_name:filename_pattern
+
+      The following example identifies two collection names and two filename
+      patterns: ::
+
+         BBFILES_DYNAMIC += "\
+             clang-layer:${LAYERDIR}/bbappends/meta-clang/*/*/*.bbappend \
+             core:${LAYERDIR}/bbappends/openembedded-core/meta/*/*/*.bbappend \
+         "
+
+      When the collection name is prefixed with "!" it will add the file pattern in case
+      the layer is absent: ::
+
+         BBFILES_DYNAMIC += "\
+             !clang-layer:${LAYERDIR}/backfill/meta-clang/*/*/*.bb \
+         "
+
+      This next example shows an error message that occurs because invalid
+      entries are found, which cause parsing to abort: ::
+
+         ERROR: BBFILES_DYNAMIC entries must be of the form {!}<collection name>:<filename pattern>, not:
+         /work/my-layer/bbappends/meta-security-isafw/*/*/*.bbappend
+         /work/my-layer/bbappends/openembedded-core/meta/*/*/*.bbappend
+
    :term:`BBINCLUDED`
       Contains a space-separated list of all of all files that BitBake's
       parser included during parsing of the current file.
@@ -1303,6 +1316,8 @@
       -  ``svn://`` : Fetches files from a Subversion (``svn``) revision
          control repository.
 
+      -  ``az://`` : Fetches files from an Azure Storage account using HTTPS.
+
       Here are some additional options worth mentioning:
 
       -  ``unpack`` : Controls whether or not to unpack the file if it is
diff --git a/poky/bitbake/lib/bb/__init__.py b/poky/bitbake/lib/bb/__init__.py
index 84a9051..afce5cc 100644
--- a/poky/bitbake/lib/bb/__init__.py
+++ b/poky/bitbake/lib/bb/__init__.py
@@ -58,7 +58,7 @@
         if not bb.event.worker_pid:
             if self.name in bb.msg.loggerDefaultDomains and loglevel > (bb.msg.loggerDefaultDomains[self.name]):
                 return
-            if loglevel > bb.msg.loggerDefaultLogLevel:
+            if loglevel < bb.msg.loggerDefaultLogLevel:
                 return
         return self.log(loglevel, msg, *args, **kwargs)
 
diff --git a/poky/bitbake/lib/bb/build.py b/poky/bitbake/lib/bb/build.py
index f4f897e..b2715fc 100644
--- a/poky/bitbake/lib/bb/build.py
+++ b/poky/bitbake/lib/bb/build.py
@@ -854,6 +854,23 @@
         file_name = d.getVar('BB_FILENAME')
         bb.parse.siggen.dump_sigtask(file_name, task, stampbase, True)
 
+def find_stale_stamps(task, d, file_name=None):
+    current = stamp_internal(task, d, file_name)
+    current2 = stamp_internal(task + "_setscene", d, file_name)
+    cleanmask = stamp_cleanmask_internal(task, d, file_name)
+    found = []
+    for mask in cleanmask:
+        for name in glob.glob(mask):
+            if "sigdata" in name or "sigbasedata" in name:
+                continue
+            if name.endswith('.taint'):
+                continue
+            if name == current or name == current2:
+                continue
+            logger.debug2("Stampfile %s does not match %s or %s" % (name, current, current2))
+            found.append(name)
+    return found
+
 def del_stamp(task, d, file_name = None):
     """
     Removes a stamp for a given task
diff --git a/poky/bitbake/lib/bb/cache.py b/poky/bitbake/lib/bb/cache.py
index aea2b8b..27eb271 100644
--- a/poky/bitbake/lib/bb/cache.py
+++ b/poky/bitbake/lib/bb/cache.py
@@ -126,6 +126,7 @@
         self.inherits         = self.getvar('__inherit_cache', metadata, expand=False)
         self.fakerootenv      = self.getvar('FAKEROOTENV', metadata)
         self.fakerootdirs     = self.getvar('FAKEROOTDIRS', metadata)
+        self.fakerootlogs     = self.getvar('FAKEROOTLOGS', metadata)
         self.fakerootnoenv    = self.getvar('FAKEROOTNOENV', metadata)
         self.extradepsfunc    = self.getvar('calculate_extra_depends', metadata)
 
@@ -163,6 +164,7 @@
         cachedata.fakerootenv = {}
         cachedata.fakerootnoenv = {}
         cachedata.fakerootdirs = {}
+        cachedata.fakerootlogs = {}
         cachedata.extradepsfunc = {}
 
     def add_cacheData(self, cachedata, fn):
@@ -231,6 +233,7 @@
         cachedata.fakerootenv[fn] = self.fakerootenv
         cachedata.fakerootnoenv[fn] = self.fakerootnoenv
         cachedata.fakerootdirs[fn] = self.fakerootdirs
+        cachedata.fakerootlogs[fn] = self.fakerootlogs
         cachedata.extradepsfunc[fn] = self.extradepsfunc
 
 def virtualfn2realfn(virtualfn):
diff --git a/poky/bitbake/lib/bb/codeparser.py b/poky/bitbake/lib/bb/codeparser.py
index 25a7ac6..0cec452 100644
--- a/poky/bitbake/lib/bb/codeparser.py
+++ b/poky/bitbake/lib/bb/codeparser.py
@@ -212,9 +212,9 @@
             funcstr = codegen.to_source(func)
             argstr = codegen.to_source(arg)
         except TypeError:
-            self.log.debug(2, 'Failed to convert function and argument to source form')
+            self.log.debug2('Failed to convert function and argument to source form')
         else:
-            self.log.debug(1, self.unhandled_message % (funcstr, argstr))
+            self.log.debug(self.unhandled_message % (funcstr, argstr))
 
     def visit_Call(self, node):
         name = self.called_node_name(node.func)
@@ -450,7 +450,7 @@
 
                 cmd = word[1]
                 if cmd.startswith("$"):
-                    self.log.debug(1, self.unhandled_template % cmd)
+                    self.log.debug(self.unhandled_template % cmd)
                 elif cmd == "eval":
                     command = " ".join(word for _, word in words[1:])
                     self._parse_shell(command)
diff --git a/poky/bitbake/lib/bb/cooker.py b/poky/bitbake/lib/bb/cooker.py
index f4ab797..39e10e6 100644
--- a/poky/bitbake/lib/bb/cooker.py
+++ b/poky/bitbake/lib/bb/cooker.py
@@ -502,22 +502,30 @@
 
     def showVersions(self):
 
-        (latest_versions, preferred_versions) = self.findProviders()
+        (latest_versions, preferred_versions, required) = self.findProviders()
 
-        logger.plain("%-35s %25s %25s", "Recipe Name", "Latest Version", "Preferred Version")
-        logger.plain("%-35s %25s %25s\n", "===========", "==============", "=================")
+        logger.plain("%-35s %25s %25s %25s", "Recipe Name", "Latest Version", "Preferred Version", "Required Version")
+        logger.plain("%-35s %25s %25s %25s\n", "===========", "==============", "=================", "================")
 
         for p in sorted(self.recipecaches[''].pkg_pn):
-            pref = preferred_versions[p]
+            preferred = preferred_versions[p]
             latest = latest_versions[p]
+            requiredstr = ""
+            preferredstr = ""
+            if required[p]:
+                if preferred[0] is not None:
+                    requiredstr = preferred[0][0] + ":" + preferred[0][1] + '-' + preferred[0][2]
+                else:
+                    bb.fatal("REQUIRED_VERSION of package %s not available" % p)
+            else:
+                preferredstr = preferred[0][0] + ":" + preferred[0][1] + '-' + preferred[0][2]
 
-            prefstr = pref[0][0] + ":" + pref[0][1] + '-' + pref[0][2]
             lateststr = latest[0][0] + ":" + latest[0][1] + "-" + latest[0][2]
 
-            if pref == latest:
-                prefstr = ""
+            if preferred == latest:
+                preferredstr = ""
 
-            logger.plain("%-35s %25s %25s", p, lateststr, prefstr)
+            logger.plain("%-35s %25s %25s %25s", p, lateststr, preferredstr, requiredstr)
 
     def showEnvironment(self, buildfile=None, pkgs_to_build=None):
         """
@@ -1063,10 +1071,16 @@
         if pn in self.recipecaches[mc].providers:
             filenames = self.recipecaches[mc].providers[pn]
             eligible, foundUnique = bb.providers.filterProviders(filenames, pn, self.databuilder.mcdata[mc], self.recipecaches[mc])
-            filename = eligible[0]
+            if eligible is not None:
+                filename = eligible[0]
+            else:
+                filename = None
             return None, None, None, filename
         elif pn in self.recipecaches[mc].pkg_pn:
-            return bb.providers.findBestProvider(pn, self.databuilder.mcdata[mc], self.recipecaches[mc], self.recipecaches[mc].pkg_pn)
+            (latest, latest_f, preferred_ver, preferred_file, required) = bb.providers.findBestProvider(pn, self.databuilder.mcdata[mc], self.recipecaches[mc], self.recipecaches[mc].pkg_pn)
+            if required and preferred_file is None:
+                return None, None, None, None
+            return (latest, latest_f, preferred_ver, preferred_file)
         else:
             return None, None, None, None
 
diff --git a/poky/bitbake/lib/bb/event.py b/poky/bitbake/lib/bb/event.py
index 23e1f31..0454c75 100644
--- a/poky/bitbake/lib/bb/event.py
+++ b/poky/bitbake/lib/bb/event.py
@@ -118,7 +118,7 @@
             if _eventfilter:
                 if not _eventfilter(name, handler, event, d):
                     continue
-            if d and not name in (d.getVar("__BBHANDLERS_MC") or []):
+            if d is not None and not name in (d.getVar("__BBHANDLERS_MC") or set()):
                 continue
             execute_handler(name, handler, event, d)
 
@@ -232,12 +232,16 @@
 def register(name, handler, mask=None, filename=None, lineno=None, data=None):
     """Register an Event handler"""
 
-    if data and data.getVar("BB_CURRENT_MC"):
+    if data is not None and data.getVar("BB_CURRENT_MC"):
         mc = data.getVar("BB_CURRENT_MC")
         name = '%s%s' % (mc.replace('-', '_'), name)
 
     # already registered
     if name in _handlers:
+        if data is not None:
+            bbhands_mc = (data.getVar("__BBHANDLERS_MC") or set())
+            bbhands_mc.add(name)
+            data.setVar("__BBHANDLERS_MC", bbhands_mc)
         return AlreadyRegistered
 
     if handler is not None:
@@ -274,16 +278,16 @@
                     _event_handler_map[m] = {}
                 _event_handler_map[m][name] = True
 
-        if data:
-            bbhands_mc = (data.getVar("__BBHANDLERS_MC") or [])
-            bbhands_mc.append(name)
+        if data is not None:
+            bbhands_mc = (data.getVar("__BBHANDLERS_MC") or set())
+            bbhands_mc.add(name)
             data.setVar("__BBHANDLERS_MC", bbhands_mc)
 
         return Registered
 
 def remove(name, handler, data=None):
     """Remove an Event handler"""
-    if data:
+    if data is not None:
         if data.getVar("BB_CURRENT_MC"):
             mc = data.getVar("BB_CURRENT_MC")
             name = '%s%s' % (mc.replace('-', '_'), name)
@@ -295,8 +299,8 @@
         if name in _event_handler_map[event]:
             _event_handler_map[event].pop(name)
 
-    if data:
-        bbhands_mc = (data.getVar("__BBHANDLERS_MC") or [])
+    if data is not None:
+        bbhands_mc = (data.getVar("__BBHANDLERS_MC") or set())
         if name in bbhands_mc:
             bbhands_mc.remove(name)
             data.setVar("__BBHANDLERS_MC", bbhands_mc)
@@ -666,6 +670,17 @@
         Event.__init__(self)
         self.stamps = stamps
 
+class StaleSetSceneTasks(Event):
+    """
+    An event listing setscene tasks which are 'stale' and will
+    be rerun. The metadata may use to clean up stale data.
+    tasks is a mapping of tasks and matching stale stamps.
+    """
+
+    def __init__(self, tasks):
+        Event.__init__(self)
+        self.tasks = tasks
+
 class FilesMatchingFound(Event):
     """
     Event when a list of files matching the supplied pattern has
diff --git a/poky/bitbake/lib/bb/fetch2/__init__.py b/poky/bitbake/lib/bb/fetch2/__init__.py
index 19169d7..cf0201c 100644
--- a/poky/bitbake/lib/bb/fetch2/__init__.py
+++ b/poky/bitbake/lib/bb/fetch2/__init__.py
@@ -1243,7 +1243,7 @@
 
             if checksum_name in self.parm:
                 checksum_expected = self.parm[checksum_name]
-            elif self.type not in ["http", "https", "ftp", "ftps", "sftp", "s3"]:
+            elif self.type not in ["http", "https", "ftp", "ftps", "sftp", "s3", "az"]:
                 checksum_expected = None
             else:
                 checksum_expected = d.getVarFlag("SRC_URI", checksum_name)
@@ -1908,6 +1908,7 @@
 from . import clearcase
 from . import npm
 from . import npmsw
+from . import az
 
 methods.append(local.Local())
 methods.append(wget.Wget())
@@ -1927,3 +1928,4 @@
 methods.append(clearcase.ClearCase())
 methods.append(npm.Npm())
 methods.append(npmsw.NpmShrinkWrap())
+methods.append(az.Az())
diff --git a/poky/bitbake/lib/bb/fetch2/az.py b/poky/bitbake/lib/bb/fetch2/az.py
new file mode 100644
index 0000000..3ccc594
--- /dev/null
+++ b/poky/bitbake/lib/bb/fetch2/az.py
@@ -0,0 +1,93 @@
+"""
+BitBake 'Fetch' Azure Storage implementation
+
+"""
+
+# Copyright (C) 2021 Alejandro Hernandez Samaniego
+#
+# Based on bb.fetch2.wget:
+# Copyright (C) 2003, 2004  Chris Larson
+#
+# SPDX-License-Identifier: GPL-2.0-only
+#
+# Based on functions from the base bb module, Copyright 2003 Holger Schurig
+
+import shlex
+import os
+import bb
+from   bb.fetch2 import FetchError
+from   bb.fetch2 import logger
+from   bb.fetch2.wget import Wget
+
+
+class Az(Wget):
+
+    def supports(self, ud, d):
+        """
+        Check to see if a given url can be fetched from Azure Storage
+        """
+        return ud.type in ['az']
+
+
+    def checkstatus(self, fetch, ud, d, try_again=True):
+
+        # checkstatus discards parameters either way, we need to do this before adding the SAS
+        ud.url = ud.url.replace('az://','https://').split(';')[0]
+
+        az_sas = d.getVar('AZ_SAS')
+        if az_sas and az_sas not in ud.url:
+            ud.url += az_sas
+
+        return Wget.checkstatus(self, fetch, ud, d, try_again)
+
+    # Override download method, include retries
+    def download(self, ud, d, retries=3):
+        """Fetch urls"""
+
+        # If were reaching the account transaction limit we might be refused a connection,
+        # retrying allows us to avoid false negatives since the limit changes over time
+        fetchcmd = self.basecmd + ' --retry-connrefused --waitretry=5'
+
+        # We need to provide a localpath to avoid wget using the SAS
+        # ud.localfile either has the downloadfilename or ud.path
+        localpath = os.path.join(d.getVar("DL_DIR"), ud.localfile)
+        bb.utils.mkdirhier(os.path.dirname(localpath))
+        fetchcmd += " -O %s" % shlex.quote(localpath)
+
+
+        if ud.user and ud.pswd:
+            fetchcmd += " --user=%s --password=%s --auth-no-challenge" % (ud.user, ud.pswd)
+
+        # Check if a Shared Access Signature was given and use it
+        az_sas = d.getVar('AZ_SAS')
+
+        if az_sas:
+            azuri = '%s%s%s%s' % ('https://', ud.host, ud.path, az_sas)
+        else:
+            azuri = '%s%s%s' % ('https://', ud.host, ud.path)
+
+        if os.path.exists(ud.localpath):
+            # file exists, but we didnt complete it.. trying again.
+            fetchcmd += d.expand(" -c -P ${DL_DIR} '%s'" % azuri)
+        else:
+            fetchcmd += d.expand(" -P ${DL_DIR} '%s'" % azuri)
+
+        try:
+            self._runwget(ud, d, fetchcmd, False)
+        except FetchError as e:
+            # Azure fails on handshake sometimes when using wget after some stress, producing a
+            # FetchError from the fetcher, if the artifact exists retyring should succeed
+            if 'Unable to establish SSL connection' in str(e):
+                logger.debug2('Unable to establish SSL connection: Retries remaining: %s, Retrying...' % retries)
+                self.download(ud, d, retries -1)
+
+        # Sanity check since wget can pretend it succeed when it didn't
+        # Also, this used to happen if sourceforge sent us to the mirror page
+        if not os.path.exists(ud.localpath):
+            raise FetchError("The fetch command returned success for url %s but %s doesn't exist?!" % (azuri, ud.localpath), azuri)
+
+        if os.path.getsize(ud.localpath) == 0:
+            os.remove(ud.localpath)
+            raise FetchError("The fetch of %s resulted in a zero size file?! Deleting and failing since this isn't right." % (azuri), azuri)
+
+        return True
diff --git a/poky/bitbake/lib/bb/providers.py b/poky/bitbake/lib/bb/providers.py
index b5a6cd0..3ec11a4 100644
--- a/poky/bitbake/lib/bb/providers.py
+++ b/poky/bitbake/lib/bb/providers.py
@@ -38,16 +38,17 @@
     localdata = data.createCopy(cfgData)
     bb.data.expandKeys(localdata)
 
+    required = {}
     preferred_versions = {}
     latest_versions = {}
 
     for pn in pkg_pn:
-        (last_ver, last_file, pref_ver, pref_file) = findBestProvider(pn, localdata, dataCache, pkg_pn)
+        (last_ver, last_file, pref_ver, pref_file, req) = findBestProvider(pn, localdata, dataCache, pkg_pn)
         preferred_versions[pn] = (pref_ver, pref_file)
         latest_versions[pn] = (last_ver, last_file)
+        required[pn] = req
 
-    return (latest_versions, preferred_versions)
-
+    return (latest_versions, preferred_versions, required)
 
 def allProviders(dataCache):
     """
@@ -59,7 +60,6 @@
         all_providers[pn].append((ver, fn))
     return all_providers
 
-
 def sortPriorities(pn, dataCache, pkg_pn = None):
     """
     Reorder pkg_pn by file priority and default preference
@@ -87,6 +87,21 @@
 
     return tmp_pn
 
+def versionVariableMatch(cfgData, keyword, pn):
+    """
+    Return the value of the <keyword>_VERSION variable if set.
+    """
+
+    # pn can contain '_', e.g. gcc-cross-x86_64 and an override cannot
+    # hence we do this manually rather than use OVERRIDES
+    ver = cfgData.getVar("%s_VERSION_pn-%s" % (keyword, pn))
+    if not ver:
+        ver = cfgData.getVar("%s_VERSION_%s" % (keyword, pn))
+    if not ver:
+        ver = cfgData.getVar("%s_VERSION" % keyword)
+
+    return ver
+
 def preferredVersionMatch(pe, pv, pr, preferred_e, preferred_v, preferred_r):
     """
     Check if the version pe,pv,pr is the preferred one.
@@ -102,19 +117,28 @@
 
 def findPreferredProvider(pn, cfgData, dataCache, pkg_pn = None, item = None):
     """
-    Find the first provider in pkg_pn with a PREFERRED_VERSION set.
+    Find the first provider in pkg_pn with REQUIRED_VERSION or PREFERRED_VERSION set.
     """
 
     preferred_file = None
     preferred_ver = None
+    required = False
 
-    # pn can contain '_', e.g. gcc-cross-x86_64 and an override cannot
-    # hence we do this manually rather than use OVERRIDES
-    preferred_v = cfgData.getVar("PREFERRED_VERSION_pn-%s" % pn)
-    if not preferred_v:
-        preferred_v = cfgData.getVar("PREFERRED_VERSION_%s" % pn)
-    if not preferred_v:
-        preferred_v = cfgData.getVar("PREFERRED_VERSION")
+    required_v = versionVariableMatch(cfgData, "REQUIRED", pn)
+    preferred_v = versionVariableMatch(cfgData, "PREFERRED", pn)
+
+    itemstr = ""
+    if item:
+        itemstr = " (for item %s)" % item
+
+    if required_v is not None:
+        if preferred_v is not None:
+            logger.warn("REQUIRED_VERSION and PREFERRED_VERSION for package %s%s are both set using REQUIRED_VERSION %s", pn, itemstr, required_v)
+        else:
+            logger.debug("REQUIRED_VERSION is set for package %s%s", pn, itemstr)
+        # REQUIRED_VERSION always takes precedence over PREFERRED_VERSION
+        preferred_v = required_v
+        required = True
 
     if preferred_v:
         m = re.match(r'(\d+:)*(.*)(_.*)*', preferred_v)
@@ -147,11 +171,9 @@
             pv_str = preferred_v
         if not (preferred_e is None):
             pv_str = '%s:%s' % (preferred_e, pv_str)
-        itemstr = ""
-        if item:
-            itemstr = " (for item %s)" % item
         if preferred_file is None:
-            logger.warn("preferred version %s of %s not available%s", pv_str, pn, itemstr)
+            if not required:
+                logger.warn("preferred version %s of %s not available%s", pv_str, pn, itemstr)
             available_vers = []
             for file_set in pkg_pn:
                 for f in file_set:
@@ -164,11 +186,15 @@
             if available_vers:
                 available_vers.sort()
                 logger.warn("versions of %s available: %s", pn, ' '.join(available_vers))
+            if required:
+                logger.error("required version %s of %s not available%s", pv_str, pn, itemstr)
         else:
-            logger.debug("selecting %s as PREFERRED_VERSION %s of package %s%s", preferred_file, pv_str, pn, itemstr)
+            if required:
+                logger.debug("selecting %s as REQUIRED_VERSION %s of package %s%s", preferred_file, pv_str, pn, itemstr)
+            else:
+                logger.debug("selecting %s as PREFERRED_VERSION %s of package %s%s", preferred_file, pv_str, pn, itemstr)
 
-    return (preferred_ver, preferred_file)
-
+    return (preferred_ver, preferred_file, required)
 
 def findLatestProvider(pn, cfgData, dataCache, file_set):
     """
@@ -189,7 +215,6 @@
 
     return (latest, latest_f)
 
-
 def findBestProvider(pn, cfgData, dataCache, pkg_pn = None, item = None):
     """
     If there is a PREFERRED_VERSION, find the highest-priority bbfile
@@ -198,17 +223,16 @@
     """
 
     sortpkg_pn = sortPriorities(pn, dataCache, pkg_pn)
-    # Find the highest priority provider with a PREFERRED_VERSION set
-    (preferred_ver, preferred_file) = findPreferredProvider(pn, cfgData, dataCache, sortpkg_pn, item)
+    # Find the highest priority provider with a REQUIRED_VERSION or PREFERRED_VERSION set
+    (preferred_ver, preferred_file, required) = findPreferredProvider(pn, cfgData, dataCache, sortpkg_pn, item)
     # Find the latest version of the highest priority provider
     (latest, latest_f) = findLatestProvider(pn, cfgData, dataCache, sortpkg_pn[0])
 
-    if preferred_file is None:
+    if not required and preferred_file is None:
         preferred_file = latest_f
         preferred_ver = latest
 
-    return (latest, latest_f, preferred_ver, preferred_file)
-
+    return (latest, latest_f, preferred_ver, preferred_file, required)
 
 def _filterProviders(providers, item, cfgData, dataCache):
     """
@@ -234,10 +258,13 @@
 
     logger.debug("providers for %s are: %s", item, list(sorted(pkg_pn.keys())))
 
-    # First add PREFERRED_VERSIONS
+    # First add REQUIRED_VERSIONS or PREFERRED_VERSIONS
     for pn in sorted(pkg_pn):
         sortpkg_pn[pn] = sortPriorities(pn, dataCache, pkg_pn)
-        preferred_versions[pn] = findPreferredProvider(pn, cfgData, dataCache, sortpkg_pn[pn], item)
+        preferred_ver, preferred_file, required = findPreferredProvider(pn, cfgData, dataCache, sortpkg_pn[pn], item)
+        if required and preferred_file is None:
+            return eligible
+        preferred_versions[pn] = (preferred_ver, preferred_file)
         if preferred_versions[pn][1]:
             eligible.append(preferred_versions[pn][1])
 
@@ -249,7 +276,6 @@
         eligible.append(preferred_versions[pn][1])
 
     if not eligible:
-        logger.error("no eligible providers for %s", item)
         return eligible
 
     # If pn == item, give it a slight default preference
@@ -266,7 +292,6 @@
 
     return eligible
 
-
 def filterProviders(providers, item, cfgData, dataCache):
     """
     Take a list of providers and filter/reorder according to the
@@ -388,7 +413,6 @@
 
     return rproviders
 
-
 def buildWorldTargetList(dataCache, task=None):
     """
     Build package list for "bitbake world"
diff --git a/poky/bitbake/lib/bb/runqueue.py b/poky/bitbake/lib/bb/runqueue.py
index 54ef245..80d7f6c 100644
--- a/poky/bitbake/lib/bb/runqueue.py
+++ b/poky/bitbake/lib/bb/runqueue.py
@@ -1242,6 +1242,7 @@
         magic = "decafbad"
         if self.cooker.configuration.profile:
             magic = "decafbadbad"
+        fakerootlogs = None
         if fakeroot:
             magic = magic + "beef"
             mcdata = self.cooker.databuilder.mcdata[mc]
@@ -1251,10 +1252,11 @@
             for key, value in (var.split('=') for var in fakerootenv):
                 env[key] = value
             worker = subprocess.Popen(fakerootcmd + ["bitbake-worker", magic], stdout=subprocess.PIPE, stdin=subprocess.PIPE, env=env)
+            fakerootlogs = self.rqdata.dataCaches[mc].fakerootlogs
         else:
             worker = subprocess.Popen(["bitbake-worker", magic], stdout=subprocess.PIPE, stdin=subprocess.PIPE)
         bb.utils.nonblockingfd(worker.stdout)
-        workerpipe = runQueuePipe(worker.stdout, None, self.cfgData, self, rqexec)
+        workerpipe = runQueuePipe(worker.stdout, None, self.cfgData, self, rqexec, fakerootlogs=fakerootlogs)
 
         workerdata = {
             "taskdeps" : self.rqdata.dataCaches[mc].task_deps,
@@ -1772,7 +1774,7 @@
         self.sqdata = SQData()
         build_scenequeue_data(self.sqdata, self.rqdata, self.rq, self.cooker, self.stampcache, self)
 
-    def runqueue_process_waitpid(self, task, status):
+    def runqueue_process_waitpid(self, task, status, fakerootlog=None):
 
         # self.build_stamps[pid] may not exist when use shared work directory.
         if task in self.build_stamps:
@@ -1787,7 +1789,7 @@
             self.sq_live.remove(task)
         else:
             if status != 0:
-                self.task_fail(task, status)
+                self.task_fail(task, status, fakerootlog=fakerootlog)
             else:
                 self.task_complete(task)
         return True
@@ -1908,14 +1910,31 @@
         self.task_completeoutright(task)
         self.runq_tasksrun.add(task)
 
-    def task_fail(self, task, exitcode):
+    def task_fail(self, task, exitcode, fakerootlog=None):
         """
         Called when a task has failed
         Updates the state engine with the failure
         """
         self.stats.taskFailed()
         self.failed_tids.append(task)
-        bb.event.fire(runQueueTaskFailed(task, self.stats, exitcode, self.rq), self.cfgData)
+
+        fakeroot_log = ""
+        if fakerootlog and os.path.exists(fakerootlog):
+            with open(fakerootlog) as fakeroot_log_file:
+                fakeroot_failed = False
+                for line in reversed(fakeroot_log_file.readlines()):
+                    for fakeroot_error in ['mismatch', 'error', 'fatal']:
+                        if fakeroot_error in line.lower():
+                            fakeroot_failed = True
+                    if 'doing new pid setup and server start' in line:
+                        break
+                    fakeroot_log = line + fakeroot_log
+
+            if not fakeroot_failed:
+                fakeroot_log = None
+
+        bb.event.fire(runQueueTaskFailed(task, self.stats, exitcode, self.rq, fakeroot_log=fakeroot_log), self.cfgData)
+
         if self.rqdata.taskData[''].abort:
             self.rq.state = runQueueCleanUp
 
@@ -1943,6 +1962,10 @@
             logger.error("Scenequeue had holdoff tasks: %s" % pprint.pformat(self.holdoff_tasks))
             err = True
 
+        for tid in self.scenequeue_covered.intersection(self.scenequeue_notcovered):
+            # No task should end up in both covered and uncovered, that is a bug.
+            logger.error("Setscene task %s in both covered and notcovered." % tid)
+
         for tid in self.rqdata.runq_setscene_tids:
             if tid not in self.scenequeue_covered and tid not in self.scenequeue_notcovered:
                 err = True
@@ -2431,6 +2454,9 @@
 
         for dep in sorted(self.sqdata.sq_deps[task]):
             if fail and task in self.sqdata.sq_harddeps and dep in self.sqdata.sq_harddeps[task]:
+                if dep in self.scenequeue_covered or dep in self.scenequeue_notcovered:
+                    # dependency could be already processed, e.g. noexec setscene task
+                    continue
                 logger.debug2("%s was unavailable and is a hard dependency of %s so skipping" % (task, dep))
                 self.sq_task_failoutright(dep)
                 continue
@@ -2755,6 +2781,20 @@
 
     update_scenequeue_data(sqdata.sq_revdeps, sqdata, rqdata, rq, cooker, stampcache, sqrq, summary=True)
 
+    # Compute a list of 'stale' sstate tasks where the current hash does not match the one
+    # in any stamp files. Pass the list out to metadata as an event.
+    found = {}
+    for tid in rqdata.runq_setscene_tids:
+        (mc, fn, taskname, taskfn) = split_tid_mcfn(tid)
+        stamps = bb.build.find_stale_stamps(taskname, rqdata.dataCaches[mc], taskfn)
+        if stamps:
+            if mc not in found:
+                found[mc] = {}
+            found[mc][tid] = stamps
+    for mc in found:
+        event = bb.event.StaleSetSceneTasks(found[mc])
+        bb.event.fire(event, cooker.databuilder.mcdata[mc])
+
 def update_scenequeue_data(tids, sqdata, rqdata, rq, cooker, stampcache, sqrq, summary=True):
 
     tocheck = set()
@@ -2876,12 +2916,16 @@
     """
     Event notifying a task failed
     """
-    def __init__(self, task, stats, exitcode, rq):
+    def __init__(self, task, stats, exitcode, rq, fakeroot_log=None):
         runQueueEvent.__init__(self, task, stats, rq)
         self.exitcode = exitcode
+        self.fakeroot_log = fakeroot_log
 
     def __str__(self):
-        return "Task (%s) failed with exit code '%s'" % (self.taskstring, self.exitcode)
+        if self.fakeroot_log:
+            return "Task (%s) failed with exit code '%s' \nPseudo log:\n%s" % (self.taskstring, self.exitcode, self.fakeroot_log)
+        else:
+            return "Task (%s) failed with exit code '%s'" % (self.taskstring, self.exitcode)
 
 class sceneQueueTaskFailed(sceneQueueEvent):
     """
@@ -2933,7 +2977,7 @@
     """
     Abstraction for a pipe between a worker thread and the server
     """
-    def __init__(self, pipein, pipeout, d, rq, rqexec):
+    def __init__(self, pipein, pipeout, d, rq, rqexec, fakerootlogs=None):
         self.input = pipein
         if pipeout:
             pipeout.close()
@@ -2942,6 +2986,7 @@
         self.d = d
         self.rq = rq
         self.rqexec = rqexec
+        self.fakerootlogs = fakerootlogs
 
     def setrunqueueexec(self, rqexec):
         self.rqexec = rqexec
@@ -2987,7 +3032,11 @@
                     task, status = pickle.loads(self.queue[10:index])
                 except (ValueError, pickle.UnpicklingError, AttributeError, IndexError) as e:
                     bb.msg.fatal("RunQueue", "failed load pickle '%s': '%s'" % (e, self.queue[10:index]))
-                self.rqexec.runqueue_process_waitpid(task, status)
+                (_, _, _, taskfn) = split_tid_mcfn(task)
+                fakerootlog = None
+                if self.fakerootlogs and taskfn and taskfn in self.fakerootlogs:
+                    fakerootlog = self.fakerootlogs[taskfn]
+                self.rqexec.runqueue_process_waitpid(task, status, fakerootlog=fakerootlog)
                 found = True
                 self.queue = self.queue[index+11:]
                 index = self.queue.find(b"</exitcode>")
diff --git a/poky/bitbake/lib/bb/tests/color.py b/poky/bitbake/lib/bb/tests/color.py
index bf03750..88dd278 100644
--- a/poky/bitbake/lib/bb/tests/color.py
+++ b/poky/bitbake/lib/bb/tests/color.py
@@ -31,7 +31,7 @@
     def setUp(self):
         self.d = bb.data.init()
         self._progress_watcher = ProgressWatcher()
-        bb.event.register("bb.build.TaskProgress", self._progress_watcher.handle_event)
+        bb.event.register("bb.build.TaskProgress", self._progress_watcher.handle_event, data=self.d)
 
     def tearDown(self):
         bb.event.remove("bb.build.TaskProgress", None)
diff --git a/poky/bitbake/lib/bb/tests/fetch.py b/poky/bitbake/lib/bb/tests/fetch.py
index 7b2dac7..ddf6e97 100644
--- a/poky/bitbake/lib/bb/tests/fetch.py
+++ b/poky/bitbake/lib/bb/tests/fetch.py
@@ -1345,7 +1345,7 @@
                       "http://downloads.yoctoproject.org/releases/sato/sato-engine-0.2.tar.gz",
                       "http://downloads.yoctoproject.org/releases/sato/sato-engine-0.3.tar.gz",
                       "https://yoctoproject.org/",
-                      "https://yoctoproject.org/documentation",
+                      "https://docs.yoctoproject.org",
                       "http://downloads.yoctoproject.org/releases/opkg/opkg-0.1.7.tar.gz",
                       "http://downloads.yoctoproject.org/releases/opkg/opkg-0.3.0.tar.gz",
                       "ftp://sourceware.org/pub/libffi/libffi-1.20.tar.gz",
diff --git a/poky/bitbake/lib/bb/tinfoil.py b/poky/bitbake/lib/bb/tinfoil.py
index 763c329..796a98f 100644
--- a/poky/bitbake/lib/bb/tinfoil.py
+++ b/poky/bitbake/lib/bb/tinfoil.py
@@ -440,7 +440,7 @@
         to initialise Tinfoil and use it with config_only=True first and
         then conditionally call this function to parse recipes later.
         """
-        config_params = TinfoilConfigParameters(config_only=False)
+        config_params = TinfoilConfigParameters(config_only=False, quiet=self.quiet)
         self.run_actions(config_params)
         self.recipes_parsed = True
 
diff --git a/poky/bitbake/lib/bblayers/query.py b/poky/bitbake/lib/bblayers/query.py
index f5e3c84..947422a 100644
--- a/poky/bitbake/lib/bblayers/query.py
+++ b/poky/bitbake/lib/bblayers/query.py
@@ -128,7 +128,7 @@
                     sys.exit(1)
 
         pkg_pn = self.tinfoil.cooker.recipecaches[mc].pkg_pn
-        (latest_versions, preferred_versions) = self.tinfoil.find_providers(mc)
+        (latest_versions, preferred_versions, required_versions) = self.tinfoil.find_providers(mc)
         allproviders = self.tinfoil.get_all_providers(mc)
 
         # Ensure we list skipped recipes