This has been seen only once, a month ago:

ERROR: linux-yocto-5.10.50+gitAUTOINC+44498529cd_3d78eb65b9-r0 do_unpack: Unpack failure for URL: 'git://git.yoctoproject.org/linux-yocto.git;name=machine;branch=v5.10/standard/base;'. No up to date source found: clone directory not available or not up to date: /home/pokybuild/yocto-worker/qemux86-64/build/build/tmp/work/qemux86_64-poky-linux/core-image-sato/1.0-r0/testsdkext/downloads/git2/git.yoctoproject.org.linux-yocto.git; shallow clone not enabled
NOTE: recipe linux-yocto-5.10.50+gitAUTOINC+44498529cd_3d78eb65b9-r0: task do_prepare_recipe_sysroot: Succeeded
ERROR: Logfile of failure stored in: /home/pokybuild/yocto-worker/qemux86-64/build/build/tmp/work/qemux86_64-poky-linux/core-image-sato/1.0-r0/testsdkext/tmp/work/qemux86_64-poky-linux/linux-yocto/5.10.50+gitAUTOINC+44498529cd_3d78eb65b9-r0/temp/log.do_unpack.17362
NOTE: recipe linux-yocto-5.10.50+gitAUTOINC+44498529cd_3d78eb65b9-r0: task do_unpack: Failed
ERROR: Task (/home/pokybuild/yocto-worker/qemux86-64/build/build/tmp/work/qemux86_64-poky-linux/core-image-sato/1.0-r0/testsdkext/layers/build/meta/recipes-kernel/linux/linux-yocto_5.10.bb:do_unpack) failed with exit code '1'
NOTE: Tasks Summary: Attempted 641 tasks of which 632 didn't need to be rerun and 1 failed.
NOTE: The errors for this build are stored in /home/pokybuild/yocto-worker/qemux86-64/build/build/tmp/work/qemux86_64-poky-linux/core-image-sato/1.0-r0/testsdkext/tmp/log/error-report/error_report_20210721021549.txt
You can send the errors to a reports server by running:
  send-error-report /home/pokybuild/yocto-worker/qemux86-64/build/build/tmp/work/qemux86_64-poky-linux/core-image-sato/1.0-r0/testsdkext/tmp/log/error-report/error_report_20210721021549.txt [-s server]
NOTE: The contents of these logs will be posted in public if you use the above command with the default server. Please ensure you remove any identifying or proprietary information when prompted before sending.
Summary: 1 task failed:
  /home/pokybuild/yocto-worker/qemux86-64/build/build/tmp/work/qemux86_64-poky-linux/core-image-sato/1.0-r0/testsdkext/layers/build/meta/recipes-kernel/linux/linux-yocto_5.10.bb:do_unpack
Summary: There was 1 ERROR message shown, returning a non-zero exit code.
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
  File "/home/pokybuild/yocto-worker/qemux86-64/build/meta/lib/oeqa/sdkext/cases/devtool.py", line 88, in test_devtool_kernelmodule
    self._run('devtool reset %s' % recipe)
  File "/home/pokybuild/yocto-worker/qemux86-64/build/meta/lib/oeqa/sdkext/case.py", line 24, in _run
    shell=True, env=env, universal_newlines=True)
  File "/usr/lib/python3.6/subprocess.py", line 356, in check_output
    **kwargs).stdout
  File "/usr/lib/python3.6/subprocess.py", line 438, in run
    output=stdout, stderr=stderr)
oeqa.utils.subprocesstweak.OETestCalledProcessError: Command '. /home/pokybuild/yocto-worker/qemux86-64/build/build/tmp/work/qemux86_64-poky-linux/core-image-sato/1.0-r0/testsdkext/environment-setup-core2-64-poky-linux > /dev/null; devtool reset kernel-module-hello-world;' returned non-zero exit status 1
Standard Output: NOTE: Starting bitbake server...
INFO: Cleaning sysroot for recipe kernel-module-hello-world...
ERROR: Command '. /home/pokybuild/yocto-worker/qemux86-64/build/build/tmp/work/qemux86_64-poky-linux/core-image-sato/1.0-r0/testsdkext/layers/build/oe-init-build-env /home/pokybuild/yocto-worker/qemux86-64/build/build/tmp/work/qemux86_64-poky-linux/core-image-sato/1.0-r0/testsdkext > /dev/null && bitbake -c clean kernel-module-hello-world' failed, output:


https://autobuilder.yoctoproject.org/typhoon/#/builders/73/builds/3692/steps/16/logs/stdio
qemux86-64 ubuntu1804-ty-3