diff --git a/poky/meta/classes/buildstats.bbclass b/poky/meta/classes/buildstats.bbclass
index 8a1466d..0de6052 100644
--- a/poky/meta/classes/buildstats.bbclass
+++ b/poky/meta/classes/buildstats.bbclass
@@ -108,25 +108,31 @@
     import subprocess, os, datetime
     # minimum time allowed for each command to run, in seconds
     time_threshold = 0.5
+    limit = 10
     # the total number of commands
     num_cmds = 0
-    # interval at which data will be logged
-    interval = int(d.getVar("BB_HEARTBEAT_EVENT", False))
     msg = ""
     if type == "interval":
+        # interval at which data will be logged
+        interval = d.getVar("BB_HEARTBEAT_EVENT", False)
+        if interval is None:
+            bb.warn("buildstats: Collecting host data at intervals failed. Set BB_HEARTBEAT_EVENT=\"<interval>\" in conf/local.conf for the interval at which host data will be logged.")
+            d.setVar("BB_LOG_HOST_STAT_ON_INTERVAL", "0")
+            return
+        interval = int(interval)
         cmds = d.getVar('BB_LOG_HOST_STAT_CMDS_INTERVAL')
-        msg = "Host Stats: Collecting data at interval.\n"
+        msg = "Host Stats: Collecting data at %d second intervals.\n" % interval
         if cmds is None:
             d.setVar("BB_LOG_HOST_STAT_ON_INTERVAL", "0")
-            bb.warn("buildstats: Collecting host data at intervals failed. Set BB_LOG_HOST_STAT_CMDS_INTERVAL=\"command1 ; command2 ; ... \" in conf/local.conf\n")
+            bb.warn("buildstats: Collecting host data at intervals failed. Set BB_LOG_HOST_STAT_CMDS_INTERVAL=\"command1 ; command2 ; ... \" in conf/local.conf.")
             return
     if type == "failure":
         cmds = d.getVar('BB_LOG_HOST_STAT_CMDS_FAILURE')
         msg = "Host Stats: Collecting data on failure.\n"
-        msg += "Failed at task " + e.task + "\n"
+        msg += "Failed at task: " + e.task + "\n"
         if cmds is None:
             d.setVar("BB_LOG_HOST_STAT_ON_FAILURE", "0")
-            bb.warn("buildstats: Collecting host data on failure failed. Set BB_LOG_HOST_STAT_CMDS_FAILURE=\"command1 ; command2 ; ... \" in conf/local.conf\n")
+            bb.warn("buildstats: Collecting host data on failure failed. Set BB_LOG_HOST_STAT_CMDS_FAILURE=\"command1 ; command2 ; ... \" in conf/local.conf.")
             return
     c_san = []
     for cmd in cmds.split(";"):
@@ -134,18 +140,20 @@
             continue
         num_cmds += 1
         c_san.append(cmd)
-    if num_cmds <= 0:
-        d.setVar("BB_LOG_HOST_STAT_ON_INTERVAL", "0")
-        d.setVar("BB_LOG_HOST_STAT_ON_FAILURE", "0")
+    if num_cmds == 0:
+        if type == "interval":
+            d.setVar("BB_LOG_HOST_STAT_ON_INTERVAL", "0")
+        if type == "failure":
+            d.setVar("BB_LOG_HOST_STAT_ON_FAILURE", "0")
         return
 
     # return if the interval is not enough to run all commands within the specified BB_HEARTBEAT_EVENT interval
-    limit = interval / num_cmds
-    if limit <= time_threshold:
-        d.setVar("BB_LOG_HOST_STAT_ON_INTERVAL", "0")
-        d.setVar("BB_LOG_HOST_STAT_ON_FAILURE", "0")
-        bb.warn("buildstats: Collecting host data failed. BB_HEARTBEAT_EVENT interval not enough to run the specified commands. HINT: Increase value of BB_HEARTBEAT_EVENT in conf/local.conf\n")
-        return
+    if type == "interval":
+        limit = interval / num_cmds
+        if limit <= time_threshold:
+            d.setVar("BB_LOG_HOST_STAT_ON_INTERVAL", "0")
+            bb.warn("buildstats: Collecting host data failed. BB_HEARTBEAT_EVENT interval not enough to run the specified commands. Increase value of BB_HEARTBEAT_EVENT in conf/local.conf.")
+            return
 
     # set the environment variables 
     path = d.getVar("PATH")
@@ -179,7 +187,7 @@
         taskdir = os.path.join(bsdir, d.getVar('PF'))
         if isinstance(e, bb.event.HeartbeatEvent) and bb.utils.to_boolean(d.getVar("BB_LOG_HOST_STAT_ON_INTERVAL")):
             bb.utils.mkdirhier(bsdir)
-            write_host_data(os.path.join(bsdir, "host_stats"), e, d, "interval")
+            write_host_data(os.path.join(bsdir, "host_stats_interval"), e, d, "interval")
 
     if isinstance(e, bb.event.BuildStarted):
         ########################################################################
@@ -254,8 +262,8 @@
         build_status = os.path.join(bsdir, "build_stats")
         with open(build_status, "a") as f:
             f.write(d.expand("Failed at: ${PF} at task: %s \n" % e.task))
-            if bb.utils.to_boolean(d.getVar("BB_LOG_HOST_STAT_ON_FAILURE")):
-                write_host_data(os.path.join(bsdir, "host_stats"), e, d, "failure")
+        if bb.utils.to_boolean(d.getVar("BB_LOG_HOST_STAT_ON_FAILURE")):
+            write_host_data(os.path.join(bsdir, "host_stats_%s_failure" % e.task), e, d, "failure")
 }
 
 addhandler run_buildstats
diff --git a/poky/meta/classes/core-image.bbclass b/poky/meta/classes/core-image.bbclass
index d81f68b..84fd3ee 100644
--- a/poky/meta/classes/core-image.bbclass
+++ b/poky/meta/classes/core-image.bbclass
@@ -31,6 +31,8 @@
 #   - post-install-logging
 # - dev-pkgs            - development packages (headers, etc.) for all installed packages in the rootfs
 # - dbg-pkgs            - debug symbol packages for all installed packages in the rootfs
+# - lic-pkgs            - license packages for all installed pacakges in the rootfs, requires
+#                         LICENSE_CREATE_PACKAGE="1" to be set when building packages too
 # - doc-pkgs            - documentation packages for all installed packages in the rootfs
 # - bash-completion-pkgs - bash-completion packages for recipes using bash-completion bbclass
 # - ptest-pkgs          - ptest packages for all ptest-enabled recipes
diff --git a/poky/meta/classes/kernel-devicetree.bbclass b/poky/meta/classes/kernel-devicetree.bbclass
index d4f8864..27a4905 100644
--- a/poky/meta/classes/kernel-devicetree.bbclass
+++ b/poky/meta/classes/kernel-devicetree.bbclass
@@ -1,8 +1,11 @@
 # Support for device tree generation
-PACKAGES_append = " \
-    ${KERNEL_PACKAGE_NAME}-devicetree \
-    ${@[d.getVar('KERNEL_PACKAGE_NAME') + '-image-zimage-bundle', ''][d.getVar('KERNEL_DEVICETREE_BUNDLE') != '1']} \
-"
+python () {
+    if not bb.data.inherits_class('nopackages', d):
+        d.appendVar("PACKAGES", " ${KERNEL_PACKAGE_NAME}-devicetree")
+        if d.getVar('KERNEL_DEVICETREE_BUNDLE') == '1':
+            d.appendVar("PACKAGES", " ${KERNEL_PACKAGE_NAME}-image-zimage-bundle")
+}
+
 FILES_${KERNEL_PACKAGE_NAME}-devicetree = "/${KERNEL_IMAGEDEST}/*.dtb /${KERNEL_IMAGEDEST}/*.dtbo"
 FILES_${KERNEL_PACKAGE_NAME}-image-zimage-bundle = "/${KERNEL_IMAGEDEST}/zImage-*.dtb.bin"
 
diff --git a/poky/meta/classes/kernel.bbclass b/poky/meta/classes/kernel.bbclass
index 379bed4..846b196 100644
--- a/poky/meta/classes/kernel.bbclass
+++ b/poky/meta/classes/kernel.bbclass
@@ -92,6 +92,8 @@
     imagedest = d.getVar('KERNEL_IMAGEDEST')
 
     for type in types.split():
+        if bb.data.inherits_class('nopackages', d):
+            continue
         typelower = type.lower()
         d.appendVar('PACKAGES', ' %s-image-%s' % (kname, typelower))
         d.setVar('FILES_' + kname + '-image-' + typelower, '/' + imagedest + '/' + type + '-${KERNEL_VERSION_NAME}' + ' /' + imagedest + '/' + type)
diff --git a/poky/meta/classes/license.bbclass b/poky/meta/classes/license.bbclass
index f7978e2..c87473c 100644
--- a/poky/meta/classes/license.bbclass
+++ b/poky/meta/classes/license.bbclass
@@ -63,14 +63,6 @@
         # first in PACKAGES to be sure that nothing else gets LICENSE_FILES_DIRECTORY
         d.setVar('PACKAGES', "%s %s" % (pn_lic, packages))
         d.setVar('FILES_' + pn_lic, files)
-    for pn in packages.split():
-        if pn == pn_lic:
-            continue
-        rrecommends_pn = d.getVar('RRECOMMENDS_' + pn)
-        if rrecommends_pn:
-            d.setVar('RRECOMMENDS_' + pn, "%s %s" % (pn_lic, rrecommends_pn))
-        else:
-            d.setVar('RRECOMMENDS_' + pn, "%s" % (pn_lic))
 
 def copy_license_files(lic_files_paths, destdir):
     import shutil
diff --git a/poky/meta/classes/license_image.bbclass b/poky/meta/classes/license_image.bbclass
index 73cebb4..5dbec28 100644
--- a/poky/meta/classes/license_image.bbclass
+++ b/poky/meta/classes/license_image.bbclass
@@ -1,5 +1,15 @@
 ROOTFS_LICENSE_DIR = "${IMAGE_ROOTFS}/usr/share/common-licenses"
 
+# This requires LICENSE_CREATE_PACKAGE=1 to work too
+COMPLEMENTARY_GLOB[lic-pkgs] = "*-lic"
+
+python() {
+    if not oe.data.typed_value('LICENSE_CREATE_PACKAGE', d):
+        features = set(oe.data.typed_value('IMAGE_FEATURES', d))
+        if 'lic-pkgs' in features:
+            bb.error("'lic-pkgs' in IMAGE_FEATURES but LICENSE_CREATE_PACKAGE not enabled to generate -lic packages")
+}
+
 python write_package_manifest() {
     # Get list of installed packages
     license_image_dir = d.expand('${LICENSE_DIRECTORY}/${IMAGE_NAME}')
diff --git a/poky/meta/classes/own-mirrors.bbclass b/poky/meta/classes/own-mirrors.bbclass
index a777835..d58a61f 100644
--- a/poky/meta/classes/own-mirrors.bbclass
+++ b/poky/meta/classes/own-mirrors.bbclass
@@ -10,4 +10,5 @@
 https?$://.*/.* ${SOURCE_MIRROR_URL} \n \
 ftp://.*/.*     ${SOURCE_MIRROR_URL} \n \
 npm://.*/?.*    ${SOURCE_MIRROR_URL} \n \
+s3://.*/.*      ${SOURCE_MIRROR_URL} \n \
 "
diff --git a/poky/meta/classes/package_pkgdata.bbclass b/poky/meta/classes/package_pkgdata.bbclass
index 18b7ed6..a1ea8fc 100644
--- a/poky/meta/classes/package_pkgdata.bbclass
+++ b/poky/meta/classes/package_pkgdata.bbclass
@@ -162,6 +162,6 @@
 
 }
 package_prepare_pkgdata[cleandirs] = "${WORKDIR_PKGDATA}"
-package_prepare_pkgdata[vardepsexclude] += "MACHINE_ARCH PACKAGE_EXTRA_ARCHS SDK_ARCH BUILD_ARCH SDK_OS BB_TASKDEPDATA"
+package_prepare_pkgdata[vardepsexclude] += "MACHINE_ARCH PACKAGE_EXTRA_ARCHS SDK_ARCH BUILD_ARCH SDK_OS BB_TASKDEPDATA SSTATETASKS"
 
 
diff --git a/poky/meta/classes/populate_sdk_ext.bbclass b/poky/meta/classes/populate_sdk_ext.bbclass
index 517b4e4..4aabafa 100644
--- a/poky/meta/classes/populate_sdk_ext.bbclass
+++ b/poky/meta/classes/populate_sdk_ext.bbclass
@@ -750,6 +750,11 @@
     if d.getVar('SDK_ARCH') != d.getVar('BUILD_ARCH'):
         bb.fatal('The extensible SDK can currently only be built for the same architecture as the machine being built on - SDK_ARCH is set to %s (likely via setting SDKMACHINE) which is different from the architecture of the build machine (%s). Unable to continue.' % (d.getVar('SDK_ARCH'), d.getVar('BUILD_ARCH')))
 
+    # FIXME hopefully we can remove this restriction at some point, but the eSDK
+    # can only be built for the primary (default) multiconfig
+    if d.getVar('BB_CURRENT_MC') != 'default':
+        bb.fatal('The extensible SDK can currently only be built for the default multiconfig.  Currently trying to build for %s.' % d.getVar('BB_CURRENT_MC'))
+
     d.setVar('SDK_INSTALL_TARGETS', get_sdk_install_targets(d))
     if d.getVar('SDK_INCLUDE_BUILDTOOLS') == '1':
         buildtools_fn = get_current_buildtools(d)
diff --git a/poky/meta/classes/pypi.bbclass b/poky/meta/classes/pypi.bbclass
index 87b4c85..384a209 100644
--- a/poky/meta/classes/pypi.bbclass
+++ b/poky/meta/classes/pypi.bbclass
@@ -19,7 +19,7 @@
 
 HOMEPAGE ?= "https://pypi.python.org/pypi/${PYPI_PACKAGE}/"
 SECTION = "devel/python"
-SRC_URI += "${PYPI_SRC_URI}"
+SRC_URI_prepend = "${PYPI_SRC_URI} "
 S = "${WORKDIR}/${PYPI_PACKAGE}-${PV}"
 
 UPSTREAM_CHECK_URI ?= "https://pypi.org/project/${PYPI_PACKAGE}/"
diff --git a/poky/meta/classes/report-error.bbclass b/poky/meta/classes/report-error.bbclass
index 9cb6b0b..de48e4f 100644
--- a/poky/meta/classes/report-error.bbclass
+++ b/poky/meta/classes/report-error.bbclass
@@ -6,8 +6,6 @@
 #
 # Licensed under the MIT license, see COPYING.MIT for details
 
-inherit base
-
 ERR_REPORT_DIR ?= "${LOG_DIR}/error-report"
 
 def errorreport_getdata(e):
diff --git a/poky/meta/classes/sstate.bbclass b/poky/meta/classes/sstate.bbclass
index 3a3f7cc..f6710fc 100644
--- a/poky/meta/classes/sstate.bbclass
+++ b/poky/meta/classes/sstate.bbclass
@@ -123,8 +123,6 @@
 python () {
     if bb.data.inherits_class('native', d):
         d.setVar('SSTATE_PKGARCH', d.getVar('BUILD_ARCH', False))
-        if d.getVar("PN") == "pseudo-native":
-            d.appendVar('SSTATE_PKGARCH', '_${ORIGNATIVELSBSTRING}')
     elif bb.data.inherits_class('crosssdk', d):
         d.setVar('SSTATE_PKGARCH', d.expand("${BUILD_ARCH}_${SDK_ARCH}_${SDK_OS}"))
     elif bb.data.inherits_class('cross', d):
@@ -483,7 +481,7 @@
         ss = sstate_state_fromvars(ld, task)
         sstate_clean_cachefile(ss, ld)
 
-def sstate_clean_manifest(manifest, d, prefix=None):
+def sstate_clean_manifest(manifest, d, canrace=False, prefix=None):
     import oe.path
 
     mfile = open(manifest)
@@ -501,7 +499,9 @@
             if entry.endswith("/"):
                 if os.path.islink(entry[:-1]):
                     os.remove(entry[:-1])
-                elif os.path.exists(entry) and len(os.listdir(entry)) == 0:
+                elif os.path.exists(entry) and len(os.listdir(entry)) == 0 and not canrace:
+                    # Removing directories whilst builds are in progress exposes a race. Only
+                    # do it in contexts where it is safe to do so.
                     os.rmdir(entry[:-1])
             else:
                 os.remove(entry)
@@ -539,7 +539,7 @@
         for lock in ss['lockfiles']:
             locks.append(bb.utils.lockfile(lock))
 
-        sstate_clean_manifest(manifest, d)
+        sstate_clean_manifest(manifest, d, canrace=True)
 
         for lock in locks:
             bb.utils.unlockfile(lock)
@@ -703,6 +703,10 @@
             os.utime(siginfo, None)
         except PermissionError:
             pass
+        except OSError as e:
+            # Handle read-only file systems gracefully
+            if e.errno != errno.EROFS:
+                raise e
 
     return
 
@@ -1145,6 +1149,10 @@
                 os.utime(siginfo, None)
             except PermissionError:
                 pass
+            except OSError as e:
+                # Handle read-only file systems gracefully
+                if e.errno != errno.EROFS:
+                    raise e
 
 }
 
diff --git a/poky/meta/classes/staging.bbclass b/poky/meta/classes/staging.bbclass
index 806a857..32a615c 100644
--- a/poky/meta/classes/staging.bbclass
+++ b/poky/meta/classes/staging.bbclass
@@ -409,7 +409,7 @@
         if os.path.islink(f) and not os.path.exists(f):
             bb.note("%s no longer exists, removing from sysroot" % f)
             lnk = os.readlink(f.replace(".complete", ""))
-            sstate_clean_manifest(depdir + "/" + lnk, d, workdir)
+            sstate_clean_manifest(depdir + "/" + lnk, d, canrace=True, prefix=workdir)
             os.unlink(f)
             os.unlink(f.replace(".complete", ""))
 
@@ -454,7 +454,7 @@
             fl = depdir + "/" + l
             bb.note("Task %s no longer depends on %s, removing from sysroot" % (mytaskname, l))
             lnk = os.readlink(fl)
-            sstate_clean_manifest(depdir + "/" + lnk, d, workdir)
+            sstate_clean_manifest(depdir + "/" + lnk, d, canrace=True, prefix=workdir)
             os.unlink(fl)
             os.unlink(fl + ".complete")
 
@@ -475,7 +475,7 @@
                 continue
             else:
                 bb.note("%s exists in sysroot, but is stale (%s vs. %s), removing." % (c, lnk, c + "." + taskhash))
-                sstate_clean_manifest(depdir + "/" + lnk, d, workdir)
+                sstate_clean_manifest(depdir + "/" + lnk, d, canrace=True, prefix=workdir)
                 os.unlink(depdir + "/" + c)
                 if os.path.lexists(depdir + "/" + c + ".complete"):
                     os.unlink(depdir + "/" + c + ".complete")
diff --git a/poky/meta/classes/testimage.bbclass b/poky/meta/classes/testimage.bbclass
index 43de9d4..ed3a885 100644
--- a/poky/meta/classes/testimage.bbclass
+++ b/poky/meta/classes/testimage.bbclass
@@ -130,6 +130,7 @@
 testimage_dump_monitor () {
     query-status
     query-block
+    dump-guest-memory {"paging":false,"protocol":"file:%s.img"}
 }
 
 python do_testimage() {