See https://uberchromegw.corp.google.com/i/chromeos/builders/arm-generic-chromium-pfq/builds/3368,
https://uberchromegw.corp.google.com/i/chromeos/builders/nyan-chrome-pfq/builds/2637,
and 
https://uberchromegw.corp.google.com/i/chromeos/builders/veyron_jerry-chromium-pfq/builds/1029

These three PFQ builders seems to fail because of the same reason.

Selected error message:

chromeos-chrome-60.0.3074.0_rc-r1: [36512/36512] LINK ./chrome
chromeos-chrome-60.0.3074.0_rc-r1: Copying Chrome tests into /build/veyron_jerry/tmp/portage/chromeos-base/chromeos-chrome-60.0.3074.0_rc-r1/work/test_src
chromeos-chrome-60.0.3074.0_rc-r1:  * Installing test targets: jpeg_decode_accelerator_unittest media_unittests sandbox_linux_unittests video_decode_accelerator_unittest video_encode_accelerator_unittest ppapi/examples/video_decode libppapi_tests.so chrome_sandbox
chromeos-chrome-60.0.3074.0_rc-r1: armv7a-cros-linux-gnueabi-strip: '/var/cache/chromeos-chrome/chrome-src/src/out_veyron_jerry/Release/ppapi/examples/video_decode': No such file
chromeos-chrome-60.0.3074.0_rc-r1: armv7a-cros-linux-gnueabi-strip: '/var/cache/chromeos-chrome/chrome-src/src/out_veyron_jerry/Release/libppapi_tests.so': No such file
chromeos-chrome-60.0.3074.0_rc-r1: cp: cannot stat '/var/cache/chromeos-chrome/chrome-src/src/out_veyron_jerry/Release/pseudo_locales/fake-bidi.pak': No such file or directory

chromeos-chrome-60.0.3074.0_rc-r1:  * install_test_resources to /build/veyron_jerry/tmp/portage/chromeos-base/chromeos-chrome-60.0.3074.0_rc-r1/work/test_src

chromeos-chrome-60.0.3074.0_rc-r1: rsync error: some files/attrs were not transferred (see previous errors) (code 23) at main.c(1165) [sender=3.1.1]

chromeos-chrome-60.0.3074.0_rc-r1: Copying Telemetry Framework into /build/veyron_jerry/tmp/portage/chromeos-base/chromeos-chrome-60.0.3074.0_rc-r1/work/telemetry_src
chromeos-chrome-60.0.3074.0_rc-r1:  * install_test_resources to /build/veyron_jerry/tmp/portage/chromeos-base/chromeos-chrome-60.0.3074.0_rc-r1/work/telemetry_src
chromeos-chrome-60.0.3074.0_rc-r1:  * Installing telemetry binaries: bitmaptools clear_system_cache minidump_stackwalk
chromeos-chrome-60.0.3074.0_rc-r1: armv7a-cros-linux-gnueabi-strip:/var/cache/chromeos-chrome/chrome-src/src/out_veyron_jerry/Release/minidump_stackwalk: File format not recognized
chromeos-chrome-60.0.3074.0_rc-r1: mv: cannot stat '/build/veyron_jerry/tmp/portage/chromeos-base/chromeos-chrome-60.0.3074.0_rc-r1/work/page_cycler_src': No such file or directory
chromeos-chrome-60.0.3074.0_rc-r1: mv: cannot stat '/build/veyron_jerry/tmp/portage/chromeos-base/chromeos-chrome-60.0.3074.0_rc-r1/work/perf_data_src': No such file or directory

chromeos-chrome-60.0.3074.0_rc-r1: ERROR:root:Could not import tzlocal.
chromeos-chrome-60.0.3074.0_rc-r1: Processing chrome_test ... 
chromeos-chrome-60.0.3074.0_rc-r1: ERROR:root:[stderr] tar: /build/veyron_jerry/usr/local/build/autotest/client/deps/chrome_test: Cannot open: No such file or directory
chromeos-chrome-60.0.3074.0_rc-r1: ERROR:root:[stderr] tar: Error is not recoverable: exiting now
chromeos-chrome-60.0.3074.0_rc-r1: Traceback (most recent call last):
chromeos-chrome-60.0.3074.0_rc-r1:   File "/build/veyron_jerry/usr/local/build/autotest/utils/packager.py", line 374, in <module>
chromeos-chrome-60.0.3074.0_rc-r1:     main()
chromeos-chrome-60.0.3074.0_rc-r1:   File "/build/veyron_jerry/usr/local/build/autotest/utils/packager.py", line 356, in main
chromeos-chrome-60.0.3074.0_rc-r1:     action=cur_action, dest_dir=options.output_dir)
chromeos-chrome-60.0.3074.0_rc-r1:   File "/build/veyron_jerry/usr/local/build/autotest/utils/packager.py", line 148, in process_packages
chromeos-chrome-60.0.3074.0_rc-r1:     build_dir, exclude_string)
chromeos-chrome-60.0.3074.0_rc-r1:   File "/build/veyron_jerry/usr/local/build/autotest/client/common_lib/packages.py", line 834, in tar_package
chromeos-chrome-60.0.3074.0_rc-r1:     utils.system(' '.join(cmd_list))
chromeos-chrome-60.0.3074.0_rc-r1:   File "/build/veyron_jerry/usr/local/build/autotest/client/common_lib/base_utils.py", line 1006, in system
chromeos-chrome-60.0.3074.0_rc-r1:     stdout_tee=TEE_TO_LOGS, stderr_tee=TEE_TO_LOGS).exit_status
chromeos-chrome-60.0.3074.0_rc-r1:   File "/build/veyron_jerry/usr/local/build/autotest/client/common_lib/base_utils.py", line 740, in run
chromeos-chrome-60.0.3074.0_rc-r1:     "Command returned non-zero exit status")
chromeos-chrome-60.0.3074.0_rc-r1: autotest_lib.client.common_lib.error.CmdError: Command <tar -cf /build/veyron_jerry/tmp/portage/chromeos-base/chromeos-chrome-60.0.3074.0_rc-r1/work/autotest-work/client/deps/chrome_test/dep-chrome_test.tar.bz2.tmp -C /build/veyron_jerry/usr/local/build/autotest/client/deps/chrome_test --use-compress-prog=pbzip2  .> failed, rc=2, Command returned non-zero exit status
chromeos-chrome-60.0.3074.0_rc-r1: * Command: 
chromeos-chrome-60.0.3074.0_rc-r1:     tar -cf /build/veyron_jerry/tmp/portage/chromeos-base/chromeos-
chromeos-chrome-60.0.3074.0_rc-r1:     chrome-60.0.3074.0_rc-r1/work/autotest-work/client/deps/chrome_test/dep-
chromeos-chrome-60.0.3074.0_rc-r1:     chrome_test.tar.bz2.tmp -C
chromeos-chrome-60.0.3074.0_rc-r1:     /build/veyron_jerry/usr/local/build/autotest/client/deps/chrome_test
chromeos-chrome-60.0.3074.0_rc-r1:     --use-compress-prog=pbzip2  .
chromeos-chrome-60.0.3074.0_rc-r1: Exit status: 2
chromeos-chrome-60.0.3074.0_rc-r1: Duration: 0.00364804267883


boost-1.62.0-r1: !!! Fetched file: boost_1_62_0.tar.bz2 VERIFY FAILED!
boost-1.62.0-r1: !!! Reason: Filesize does not match recorded size
boost-1.62.0-r1: !!! Got:      84513338
boost-1.62.0-r1: !!! Expected: 84529021

Packages failed:
	dev-libs/boost-1.62.0-r1
ERROR   : Tue Apr 18 18:12:29 PDT 2017
ERROR   :  PGID  PPID   PID     ELAPSED     TIME %CPU COMMAND
ERROR   : Arguments of 10: ./build_packages '--board=veyron_jerry' '--accept_licenses=@CHROMEOS' '--withdebugsymbols' '--skip_chroot_upgrade' '--noworkon' '--withevents' '--eventfile=/mnt/host/source/buildbot_archive/veyron_jerry-chromium-pfq/R60-9474.0.0-rc3/build-events.json' '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:307:main(), called: die_err_trap  
ERROR   : 
ERROR   : Command failed:
ERROR   :   Command '( if [[ "${FLAGS_run_goma}" -eq "${FLAGS_TRUE}" ]]; then
ERROR   :     info "Starting goma compiler_proxy."; goma_ctl="${GOMA_DIR:-${HOME}/goma}/goma_ctl.py"; "${goma_ctl}" restart; trap "\"${goma_ctl}\" stop" EXIT;
ERROR   : fi; set -o pipefail; sudo -E "${EMERGE_CMD[@]}" "${EMERGE_FLAGS[@]}" "${PACKAGES[@]}" | tee "${tmpfile}" )' exited with nonzero code: 1
18:12:29: ERROR: 
return code: 1; command: /b/cbuild/repository/chromite/bin/cros_sdk '--chrome_root=/b/cbuild/repository/.cache/distfiles/target-master/chrome-src' 'PARALLEL_EMERGE_STATUS_FILE=/tmp/tmpbywLDy' 'USE=-chrome_internal' 'FEATURES=separatedebug' 'CHROME_ORIGIN=LOCAL_SOURCE' -- ./build_packages '--board=veyron_jerry' '--accept_licenses=@CHROMEOS' --withdebugsymbols --skip_chroot_upgrade --noworkon --withevents '--eventfile=/mnt/host/source/buildbot_archive/veyron_jerry-chromium-pfq/R60-9474.0.0-rc3/build-events.json' virtual/target-os virtual/target-os-dev virtual/target-os-test virtual/target-os-factory virtual/target-os-factory-shim chromeos-base/autotest-all
cmd=['/b/cbuild/repository/chromite/bin/cros_sdk', '--chrome_root=/b/cbuild/repository/.cache/distfiles/target-master/chrome-src', 'PARALLEL_EMERGE_STATUS_FILE=/tmp/tmpbywLDy', u'USE=-chrome_internal', 'FEATURES=separatedebug', 'CHROME_ORIGIN=LOCAL_SOURCE', '--', './build_packages', u'--board=veyron_jerry', '--accept_licenses=@CHROMEOS', '--withdebugsymbols', '--skip_chroot_upgrade', '--noworkon', '--withevents', u'--eventfile=/mnt/host/source/buildbot_archive/veyron_jerry-chromium-pfq/R60-9474.0.0-rc3/build-events.json', '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/repository, extra env={'PARALLEL_EMERGE_STATUS_FILE': '/tmp/tmpbywLDy', 'USE': u'-chrome_internal', 'FEATURES': 'separatedebug', 'CHROME_ORIGIN': 'LOCAL_SOURCE'}