M72 had build failures on the latest RC

Boards not included:
winky

winky:
https://luci-logdog.appspot.com/logs/chromeos/buildbucket/cr-buildbucket.appspot.com/8926642308091796688/+/steps/Archive/0/stdout

Error:
CreateTarballError: return code: 1; command: tar --sparse -I /b/swarming/wxIRTd0/ir/cache/cbuild/repository/chroot/usr/bin/pbzip2 -cf /b/swarming/wxIRTd0/ir/cache/cbuild/repository/src/build/images/winky/latest-cbuildbot/autotest.tar.bz2 autotest
CreateTarball
 to fail.
02:46:57: INFO: Running cidb query on pid 8721, repr(query) starts with <sqlalchemy.sql.expression.Update object at 0x7fac8394aa10>
02:46:57: INFO: Running cidb query on pid 8721, repr(query) starts with <sqlalchemy.sql.expression.Insert object at 0x7fac8394ad90>
02:46:57: INFO: Running cidb query on pid 8721, repr(query) starts with <sqlalchemy.sql.expression.Insert object at 0x7fac8394aa90>