Hi Hongxu,

I'm back on this issue. So yesterday I tried again to pick these
patches, and got warnings again:

https://valkyrie.yoctoproject.org/#/builders/29/builds/682

If I relaunch the builds, sometimes they will success, sometimes I still
get the warnings. Something seems to be intermittent here.

I tried to reproduce locally, and again, I get the warnings in some
intermittent way.

My setup was:
- Clean build directory, empty sstate cache.
- The local.conf attached. This is mainly the configuration used for
  https://valkyrie.yoctoproject.org/#/builders/8/builds/698, with some
  minor changes (like disabling the shared sstate configuration).
- Using meta, meta-poky and meta-yocto-bsp at this revision:
  https://git.yoctoproject.org/poky-ci-archive/tag/?h=a-full-685
- Used: bitbake core-image-sato core-image-sato-sdk core-image-minimal 
core-image-minimal-dev core-image-full-cmdline core-image-sato:do_populate_sdk

Now here is how it went:
- On my very first build, I got some SPDX warnings.
- On my next build they were all gone.
- I tried to tweak a bit my config, cleaned my cache again and still got
  no warnings.
- Then after some various modifications, I switched back again to my
  very first configuration, and got again some SPDX warnings.

So I'm sorry, I cannot give you some exact instructions to reproduce
this issue, but still we have some intermittent warnings :(

-- 
Mathieu Dubois-Briand, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com

#
# This file is your local configuration file and is where all local user 
settings
# are placed. The comments in this file give some guide to the options a new 
user
# to the system might want to change but pretty much any configuration option 
can
# be set in this file. More adventurous users can look at
# local.conf.sample.extended which contains other examples of configuration 
which
# can be placed in this file but new users likely won't need any of them
# initially. There's also site.conf.sample which contains examples of site 
specific
# information such as proxy server addresses.
#
# Lines starting with the '#' character are commented out and in some cases the
# default values are provided as comments to show people example syntax. 
Enabling
# the option is a question of removing the # character and making any change to 
the
# variable as required.

#
# Machine Selection
#
# You need to select a specific machine to target the build with. There are a 
selection
# of emulated machines available which can boot and run in the QEMU emulator:
#
#MACHINE ?= "qemuarm"
#MACHINE ?= "qemuarm64"
#MACHINE ?= "qemumips"
#MACHINE ?= "qemumips64"
#MACHINE ?= "qemuppc"
#MACHINE ?= "qemux86"
#MACHINE ?= "qemux86-64"
#
# There are also the following hardware board target machines included for 
# demonstration purposes:
#
#MACHINE ?= "beaglebone-yocto"
#MACHINE ?= "genericarm64"
#MACHINE ?= "genericx86"
#MACHINE ?= "genericx86-64"
#
# This sets the default machine to be qemux86-64 if no other machine is 
selected:
MACHINE ??= "qemux86-64"

# These are some of the more commonly used values. Looking at the files in the
# meta/conf/machine directory, or the conf/machine directory of any additional 
layers
# you add in will show all the available machines.

#
# Where to place downloads
#
# During a first build the system will download many different source code 
tarballs
# from various upstream projects. This can take a while, particularly if your 
network
# connection is slow. These are all stored in DL_DIR. When wiping and 
rebuilding you
# can preserve this directory to speed up this part of subsequent builds. This 
directory
# is safe to share between multiple builds on the same machine too.
#
# The default is a downloads directory under TOPDIR which is the build 
directory.
#
#DL_DIR ?= "${TOPDIR}/../build/downloads"

#
# Where to place shared-state files
#
# BitBake has the capability to accelerate builds based on previously built 
output.
# This is done using "shared state" files which can be thought of as cache 
objects
# and this option determines where those files are placed.
#
# You can wipe out TMPDIR leaving this directory intact and the build would 
regenerate
# from these files if no changes were made to the configuration. If changes 
were made
# to the configuration, only shared state files where the state was still valid 
would
# be used (done using checksums).
#
# The default is a sstate-cache directory under TOPDIR.
#
#SSTATE_DIR ?= "${TOPDIR}/sstate-cache"

#
# Where to place the build output
#
# This option specifies where the bulk of the building work should be done and
# where BitBake should place its temporary files and output. Keep in mind that
# this includes the extraction and compilation of many applications and the 
toolchain
# which can use Gigabytes of hard disk space.
#
# The default is a tmp directory under TOPDIR.
#
#TMPDIR = "${TOPDIR}/tmp"

#
# Default policy config
#
# The distribution setting controls which policy settings are used as defaults.
# The default value is fine for general Yocto project use, at least initially.
# Ultimately when creating custom policy, people will likely end up subclassing 
# these defaults.
#
DISTRO ?= "poky"
# As an example of a subclass there is a "bleeding" edge policy configuration
# where many versions are set to the absolute latest code from the upstream 
# source control systems. This is just mentioned here as an example, its not
# useful to most new users.
# DISTRO ?= "poky-bleeding"

#
# Package Management configuration
#
# This variable lists which packaging formats to enable. Multiple package 
backends
# can be enabled at once and the first item listed in the variable will be used
# to generate the root filesystems.
# Options are:
#  - 'package_deb' for debian style deb files
#  - 'package_ipk' for ipk files are used by opkg (a debian style embedded 
package manager)
#  - 'package_rpm' for rpm style packages
# E.g.: PACKAGE_CLASSES ?= "package_rpm package_deb package_ipk"
# OE-Core defaults to ipkg, whilst Poky defaults to rpm:
# PACKAGE_CLASSES ?= "package_rpm"

#
# SDK target architecture
#
# This variable specifies the architecture to build SDK items for and means
# you can build the SDK packages for architectures other than the machine you 
are
# running the build on (i.e. building i686 packages on an x86_64 host).
# Supported values are i686, x86_64, aarch64
#SDKMACHINE ?= "i686"

#
# Extra image configuration defaults
#
# The EXTRA_IMAGE_FEATURES variable allows extra packages to be added to the 
generated
# images. Some of these options are added to certain image types automatically. 
Some
# of the features available are:
#  "dbg-pkgs"             - add -dbg packages for all installed packages
#                           (adds symbol information for debugging/profiling)
#  "src-pkgs"             - add -src packages for all installed packages
#                           (adds source code for debugging)
#  "dev-pkgs"             - add -dev packages for all installed packages
#                           (useful if you want to develop against libs in the 
image)
#  "ptest-pkgs"           - add -ptest packages for all ptest-enabled packages
#                           (useful if you want to run the package test suites)
#  "tools-sdk"            - add development tools (gcc, make, pkgconfig etc.)
#  "tools-debug"          - add debugging tools (gdb, strace)
#  "eclipse-debug"        - add Eclipse remote debugging support
#  "tools-profile"        - add profiling tools (oprofile, lttng, valgrind)
#  "tools-testapps"       - add useful testing tools (ts_print, aplay, arecord 
etc.)
#  "allow-empty-password" - allow users to have an empty password
#  "empty-root-password"  - the root user has no password set
#  "allow-root-login      - the root user can login
# There are other features that can be used here too, see
# meta/classes-recipe/image.bbclass and
# meta/classes-recipe/core-image.bbclass for more details.
# We default to allowing root login without a password for convenience.
EXTRA_IMAGE_FEATURES ?= "allow-empty-password empty-root-password 
allow-root-login"

#
# Additional image features
#
# The following is a list of additional classes to use when building images 
which
# enable extra features. Some available options which can be included in this 
variable
# are:
#   - 'buildstats' collect build statistics
USER_CLASSES ?= "buildstats"

#
# Runtime testing of images
#
# The build system can test booting virtual machine images under qemu (an 
emulator)
# after any root filesystems are created and run tests against those images. It 
can also
# run tests against any SDK that are built. To enable this uncomment these 
lines.
# See meta/classes-recipe/test{image,sdk}.bbclass for further details.
#IMAGE_CLASSES += "testimage testsdk"
#TESTIMAGE_AUTO:qemuall = "1"

#
# Interactive shell configuration
#
# Under certain circumstances the system may need input from you and to do this 
it
# can launch an interactive shell. It needs to do this since the build is
# multithreaded and needs to be able to handle the case where more than one 
parallel
# process may require the user's attention. The default is iterate over the 
available
# terminal types to find one that works.
#
# Examples of the occasions this may happen are when resolving patches which 
cannot
# be applied, to use the devshell or the kernel menuconfig
#
# Supported values are auto, gnome, xfce, rxvt, screen, konsole (KDE 3.x only), 
none
# Note: currently, Konsole support only works for KDE 3.x due to the way
# newer Konsole versions behave
#OE_TERMINAL = "auto"
# By default disable interactive patch resolution (tasks will just fail 
instead):
PATCHRESOLVE = "noop"

#
# Disk Space Monitoring during the build
#
# Monitor the disk space during the build. If there is less that 1GB of space 
or less
# than 100K inodes in any key build location (TMPDIR, DL_DIR, SSTATE_DIR), 
gracefully
# shutdown the build. If there is less than 100MB or 1K inodes, perform a hard 
halt
# of the build. The reason for this is that running completely out of space can 
corrupt
# files and damages the build in ways which may not be easily recoverable.
# It's necessary to monitor /tmp, if there is no space left the build will fail
# with very exotic errors.
BB_DISKMON_DIRS ??= "\
    STOPTASKS,${TMPDIR},1G,100K \
    STOPTASKS,${DL_DIR},1G,100K \
    STOPTASKS,${SSTATE_DIR},1G,100K \
    STOPTASKS,/tmp,100M,100K \
    HALT,${TMPDIR},100M,1K \
    HALT,${DL_DIR},100M,1K \
    HALT,${SSTATE_DIR},100M,1K \
    HALT,/tmp,10M,1K"

#
# Shared-state files from other locations
#
# As mentioned above, shared state files are prebuilt cache data objects which 
can be
# used to accelerate build time. This variable can be used to configure the 
system
# to search other mirror locations for these objects before it builds the data 
itself.
#
# This can be a filesystem directory, or a remote url such as https or ftp. 
These
# would contain the sstate-cache results from previous builds (possibly from 
other
# machines). This variable works like fetcher MIRRORS/PREMIRRORS and points to 
the
# cache locations to check for the shared objects.
# NOTE: if the mirror uses the same structure as SSTATE_DIR, you need to add 
PATH
# at the end as shown in the examples below. This will be substituted with the
# correct path within the directory structure.
#SSTATE_MIRRORS ?= "\
#file://.* https://someserver.tld/share/sstate/PATH;downloadfilename=PATH \
#file://.* file:///some/local/dir/sstate/PATH"

#
# Yocto Project SState Mirror
#
# The Yocto Project has prebuilt artefacts available for its releases, you can 
enable
# use of these by uncommenting some of the following lines. This will mean the 
build uses
# the network to check for artefacts at the start of builds, which does slow it 
down
# initially but it will then speed up the builds by not having to build things 
if they are
# present in the cache. It assumes you can download something faster than you 
can build it
# which will depend on your network.
# Note: For this to work you also need hash-equivalence passthrough to the 
matching server
# There is a choice between our sstate server directly and a faster content 
delivery network
# (CDN) kindly provided by JSDelivr, uncomment one of the SSTATE_MIRRORS lines, 
not both.
# Using the CDN rather than the yoctoproject.org address is suggested/preferred.
#
#BB_HASHSERVE_UPSTREAM = 'wss://hashserv.yoctoproject.org/ws'
#SSTATE_MIRRORS ?= "file://.* 
http://cdn.jsdelivr.net/yocto/sstate/all/PATH;downloadfilename=PATH";
#
###SSTATE_MIRRORS ?= "file://.* 
http://sstate.yoctoproject.org/all/PATH;downloadfilename=PATH";


#
# Qemu configuration
#
# By default native qemu will build with a builtin VNC server where graphical 
output can be
# seen. The line below enables the SDL UI frontend too.
PACKAGECONFIG:append:pn-qemu-system-native = " sdl"
# By default libsdl2-native will be built, if you want to use your host's 
libSDL instead of 
# the minimal libsdl built by libsdl2-native then uncomment the ASSUME_PROVIDED 
line below.
#ASSUME_PROVIDED += "libsdl2-native"

# You can also enable the Gtk UI frontend, which takes somewhat longer to 
build, but adds
# a handy set of menus for controlling the emulator.
#PACKAGECONFIG:append:pn-qemu-system-native = " gtk+"

#
# Hash Equivalence
#
# Enable support for automatically running a local hash equivalence server and
# instruct bitbake to use a hash equivalence aware signature generator. Hash
# equivalence improves reuse of sstate by detecting when a given sstate
# artifact can be reused as equivalent, even if the current task hash doesn't
# match the one that generated the artifact.
#
# A shared hash equivalent server can be set with "<HOSTNAME>:<PORT>" format
#
#BB_HASHSERVE = "auto"
#BB_SIGNATURE_HANDLER = "OEEquivHash"

#
# Memory Resident Bitbake
#
# Bitbake's server component can stay in memory after the UI for the current 
command
# has completed. This means subsequent commands can run faster since there is 
no need
# for bitbake to reload cache files and so on. Number is in seconds, after 
which the
# server will shut down.
#
#BB_SERVER_TIMEOUT = "60"

# CONF_VERSION is increased each time build/conf/ changes incompatibly and is 
used to
# track the version of this file when it was generated. This can safely be 
ignored if
# this doesn't mean anything to you.
CONF_VERSION = "2"
MACHINE = "qemuarm64"
DISTRO = "poky"
SDKMACHINE = "aarch64"
PACKAGE_CLASSES = "package_rpm package_deb package_ipk"
INHERIT += 'image-buildinfo'
IMAGE_BUILDINFO_VARS:append = ' IMAGE_BASENAME IMAGE_NAME'
QEMU_USE_KVM = 'True'
INHERIT += 'report-error'
PREMIRRORS = ''
BB_GENERATE_MIRROR_TARBALLS = '1'
BB_NUMBER_THREADS = '16'
BB_NUMBER_PARSE_THREADS = '16'
PARALLEL_MAKE = '-j 16 -l 75'
BB_PRESSURE_MAX_CPU = '20000'
BB_PRESSURE_MAX_IO = '20000'
XZ_MEMLIMIT = '5%'
XZ_THREADS = '8'
ZSTD_THREADS = '8'
BB_TASK_NICE_LEVEL = '5'
BB_TASK_NICE_LEVEL:task-testimage = '0'
BB_TASK_IONICE_LEVEL = '2.7'
BB_TASK_IONICE_LEVEL:task-testimage = '2.1'
IMAGE_CLASSES += 'testimage'
TEST_QEMUBOOT_TIMEOUT = '1500'
SANITY_TESTED_DISTROS = ''
SDK_EXT_TYPE = 'minimal'
SDK_INCLUDE_TOOLCHAIN = '1'
ESDK_LOCALCONF_REMOVE:append = 'BB_HASHSERVE'
BB_DISKMON_DIRS = 'STOPTASKS,${TMPDIR},1G,100K STOPTASKS,${DL_DIR},1G 
STOPTASKS,${SSTATE_DIR},1G STOPTASKS,/tmp,100M,30K HALT,${TMPDIR},100M,1K 
HALT,${DL_DIR},100M HALT,${SSTATE_DIR},100M HALT,/tmp,10M,1K'
BB_HEARTBEAT_EVENT = '60'
BB_LOG_HOST_STAT_ON_INTERVAL = '1'
BB_LOG_HOST_STAT_CMDS_INTERVAL = 'oe-time-dd-test.sh -c 100 -t 3'
BB_LOG_HOST_STAT_ON_FAILURE = '1'
BB_LOG_HOST_STAT_CMDS_FAILURE = 'oe-time-dd-test.sh -l'
BB_SERVER_TIMEOUT = '60'
BB_LOADFACTOR_MAX = '1.5'
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