90% of the Canary builds fail at BuildPackage stage because of the following error:

crosh-extension-0.8.34.4-r4: ---------                     -------
crosh-extension-0.8.34.4-r4:   1144109                     132 files
crosh-extension-0.8.34.4-r4: 
crosh-extension-0.8.34.4-r4: HEY!
crosh-extension-0.8.34.4-r4: You'll need to convert ./manifest.json to crosh and commit it to
crosh-extension-0.8.34.4-r4: src/chrome/browser/resources/chromeos/crosh_builtin/manifest.json
crosh-extension-0.8.34.4-r4: >>> Source compiled.
crosh-extension-0.8.34.4-r4: >>> Test phase [not enabled]: chromeos-base/crosh-extension-0.8.34.4-r4
crosh-extension-0.8.34.4-r4: 
crosh-extension-0.8.34.4-r4: >>> Install crosh-extension-0.8.34.4-r4 into /build/parrot/tmp/portage/chromeos-base/crosh-extension-0.8.34.4-r4/image/ category chromeos-base
crosh-extension-0.8.34.4-r4: unzip:  cannot find or open nassh/bin/crosh_builtin.zip, nassh/bin/crosh_builtin.zip.zip or nassh/bin/crosh_builtin.zip.ZIP.
crosh-extension-0.8.34.4-r4:  * ERROR: chromeos-base/crosh-extension-0.8.34.4-r4::chromiumos failed (install phase):
crosh-extension-0.8.34.4-r4:  *   (no error message)
crosh-extension-0.8.34.4-r4:  * 
crosh-extension-0.8.34.4-r4:  * Call stack:
crosh-extension-0.8.34.4-r4:  *     ebuild.sh, line  93:  Called src_install
crosh-extension-0.8.34.4-r4:  *   environment, line 3282:  Called die
crosh-extension-0.8.34.4-r4:  * The specific snippet of code:
crosh-extension-0.8.34.4-r4:  *       unzip -d crosh_builtin_deploy/ nassh/bin/crosh_builtin.zip || die;
crosh-extension-0.8.34.4-r4:  * 
crosh-extension-0.8.34.4-r4:  * If you need support, post the output of `emerge --info '=chromeos-base/crosh-extension-0.8.34.4-r4::chromiumos'`,
crosh-extension-0.8.34.4-r4:  * the complete build log and the output of `emerge -pqv '=chromeos-base/crosh-extension-0.8.34.4-r4::chromiumos'`.
crosh-extension-0.8.34.4-r4:  * The complete build log is located at '/build/parrot/tmp/portage/logs/chromeos-base:crosh-extension-0.8.34.4-r4:20160927-193854.log'.
crosh-extension-0.8.34.4-r4:  * For convenience, a symlink to the build log is located at '/build/parrot/tmp/portage/chromeos-base/crosh-extension-0.8.34.4-r4/temp/build.log'.
crosh-extension-0.8.34.4-r4:  * The ebuild environment file is located at '/build/parrot/tmp/portage/chromeos-base/crosh-extension-0.8.34.4-r4/temp/environment'.
crosh-extension-0.8.34.4-r4:  * Working directory: '/build/parrot/tmp/portage/chromeos-base/crosh-extension-0.8.34.4-r4/work/crosh-extension-0.8.34.4'
crosh-extension-0.8.34.4-r4:  * S: '/build/parrot/tmp/portage/chromeos-base/crosh-extension-0.8.34.4-r4/work/crosh-extension-0.8.34.4'
crosh-extension-0.8.34.4-r4: >>> Failed to emerge chromeos-base/crosh-extension-0.8.34.4-r4 for /build/parrot/, Log file:
crosh-extension-0.8.34.4-r4: >>>  '/build/parrot/tmp/portage/logs/chromeos-base:crosh-extension-0.8.34.4-r4:20160927-193854.log'
crosh-extension-0.8.34.4-r4: 
crosh-extension-0.8.34.4-r4:  * Messages for package chromeos-base/crosh-extension-0.8.34.4-r4 merged to /build/parrot/:
crosh-extension-0.8.34.4-r4: 
crosh-extension-0.8.34.4-r4:  * ERROR: chromeos-base/crosh-extension-0.8.34.4-r4::chromiumos failed (install phase):
crosh-extension-0.8.34.4-r4:  *   (no error message)
crosh-extension-0.8.34.4-r4:  * 
crosh-extension-0.8.34.4-r4:  * Call stack:
crosh-extension-0.8.34.4-r4:  *     ebuild.sh, line  93:  Called src_install
crosh-extension-0.8.34.4-r4:  *   environment, line 3282:  Called die
crosh-extension-0.8.34.4-r4:  * The specific snippet of code:
crosh-extension-0.8.34.4-r4:  *       unzip -d crosh_builtin_deploy/ nassh/bin/crosh_builtin.zip || die;
crosh-extension-0.8.34.4-r4:  * 
crosh-extension-0.8.34.4-r4:  * If you need support, post the output of `emerge --info '=chromeos-base/crosh-extension-0.8.34.4-r4::chromiumos'`,
crosh-extension-0.8.34.4-r4:  * the complete build log and the output of `emerge -pqv '=chromeos-base/crosh-extension-0.8.34.4-r4::chromiumos'`.
crosh-extension-0.8.34.4-r4:  * The complete build log is located at '/build/parrot/tmp/portage/logs/chromeos-base:crosh-extension-0.8.34.4-r4:20160927-193854.log'.
crosh-extension-0.8.34.4-r4:  * For convenience, a symlink to the build log is located at '/build/parrot/tmp/portage/chromeos-base/crosh-extension-0.8.34.4-r4/temp/build.log'.
crosh-extension-0.8.34.4-r4:  * The ebuild environment file is located at '/build/parrot/tmp/portage/chromeos-base/crosh-extension-0.8.34.4-r4/temp/environment'.
crosh-extension-0.8.34.4-r4:  * Working directory: '/build/parrot/tmp/portage/chromeos-base/crosh-extension-0.8.34.4-r4/work/crosh-extension-0.8.34.4'
crosh-extension-0.8.34.4-r4:  * S: '/build/parrot/tmp/portage/chromeos-base/crosh-extension-0.8.34.4-r4/work/crosh-extension-0.8.34.4'
=== Complete: job crosh-extension-0.8.34.4-r4 (0m4.5s) ===
Failed chromeos-base/crosh-extension-0.8.34.4-r4 (in 0m4.5s). Your build has failed.
Pending 4/624, [Time 12:38:58 | Elapsed 124m29.0s | Load 1.32 4.64 14.46]
Packages failed:
	chromeos-base/crosh-extension-0.8.34.4-r4
ERROR   : Tue Sep 27 12:38:59 PDT 2016
ERROR   :  PGID  PPID   PID     ELAPSED     TIME %CPU COMMAND
ERROR   : Arguments of 10: ./build_packages '--board=parrot' '--accept_licenses=@CHROMEOS' '--withdebugsymbols' '--skip_chroot_upgrade' '--nousepkg' '--reuse_pkgs_from_local_boards' '--noworkon' 'virtual/target-os' 'virtual/target-os-dev' 'virtual/target-os-test' 'virtual/target-os-factory' 'virtual/target-os-factory-shim' 'chromeos-base/autotest-all'
ERROR   : Backtrace:  (most recent call is last)
ERROR   :  build_packages:265:main(), called: die_err_trap  
ERROR   : 
ERROR   : Command failed:
ERROR   :   Command '( set -o pipefail; sudo -E "${EMERGE_CMD[@]}" "${EMERGE_FLAGS[@]}" "${PACKAGES[@]}" | tee "${tmpfile}" )' exited with nonzero code: 1
12:38:59: ERROR: 
return code: 1; command: /b/cbuild/internal_master/chromite/bin/cros_sdk '--chrome_root=/b/cbuild/internal_master/.cache/distfiles/target/chrome-src-internal' 'PARALLEL_EMERGE_STATUS_FILE=/tmp/tmp4VXfVc' 'USE=-cros-debug chrome_internal afdo_use' 'FEATURES=separatedebug' 'CHROME_ORIGIN=LOCAL_SOURCE' -- ./build_packages '--board=parrot' '--accept_licenses=@CHROMEOS' --withdebugsymbols --skip_chroot_upgrade --nousepkg --reuse_pkgs_from_local_boards --noworkon virtual/target-os virtual/target-os-dev virtual/target-os-test virtual/target-os-factory virtual/target-os-factory-shim chromeos-base/autotest-all
cwd=/b/cbuild/internal_master, extra env={'PARALLEL_EMERGE_STATUS_FILE': '/tmp/tmp4VXfVc', 'USE': '-cros-debug chrome_internal afdo_use', 'FEATURES': 'separatedebug', 'CHROME_ORIGIN': 'LOCAL_SOURCE'}

@@@STEP_FAILURE@@@
12:38:59: ERROR: Packages failed in ./build_packages: chromeos-base/crosh-extension
12:38:59: INFO: Running cidb query on pid 9064, repr(query) starts with <sqlalchemy.sql.expression.Update object at 0x4701a90>
12:39:04: INFO: cidb query succeeded after 1 retries
12:39:04: INFO: Running cidb query on pid 9064, repr(query) starts with <sqlalchemy.sql.expression.Insert object at 0x46d2710>
12:39:04: INFO: Refreshing due to a 401 (attempt 1/2)
12:39:04: INFO: Refreshing access_token