Log here:
https://luci-logdog.appspot.com/v/?s=chromium%2Fbb%2Fchromium.infra%2Finfra-continuous-mac-10.9-64%2F3408%2F%2B%2Frecipes%2Fsteps%2Fcipd_-_test_packages_integrity%2F0%2Fstdout

======================================================================
ERROR: infra.tools.send_ts_mon_values.test.common_test.ArgumentTest.test_smoke_all_flags (/private/tmp/tmp5rCvBCcipd_test/infra_python/infra/tools/send_ts_mon_values/test/common_test.expected/ArgumentTest.test_smoke_all_flags.json)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/private/tmp/tmp5rCvBCcipd_test/infra_python/.cipd/pkgs/infra_python_mac-amd64-mac10_9_Tl9ixxwAAW/3f066a590b1803402432e4f7aa1bc2d401b59140/ENV/lib/python2.7/site-packages/expect_tests/pipeline.py", line 397, in process_test
    subresult = subtest.run()
  File "/private/tmp/tmp5rCvBCcipd_test/infra_python/.cipd/pkgs/infra_python_mac-amd64-mac10_9_Tl9ixxwAAW/3f066a590b1803402432e4f7aa1bc2d401b59140/ENV/lib/python2.7/site-packages/expect_tests/type_definitions.py", line 240, in run
    return self.func_call(context=context)
  File "/private/tmp/tmp5rCvBCcipd_test/infra_python/.cipd/pkgs/infra_python_mac-amd64-mac10_9_Tl9ixxwAAW/3f066a590b1803402432e4f7aa1bc2d401b59140/ENV/lib/python2.7/site-packages/expect_tests/type_definitions.py", line 155, in __call__
    return f.func(*f.args, **f.kwargs)
  File "/private/tmp/tmp5rCvBCcipd_test/infra_python/.cipd/pkgs/infra_python_mac-amd64-mac10_9_Tl9ixxwAAW/3f066a590b1803402432e4f7aa1bc2d401b59140/ENV/lib/python2.7/site-packages/expect_tests/unittest_helper.py", line 40, in _RunTestCaseSingle
    return Result(test_method())
  File "/private/tmp/tmp5rCvBCcipd_test/infra_python/infra/tools/send_ts_mon_values/test/common_test.py", line 36, in test_smoke_all_flags
    '--cumulative={}'))
  File "/private/tmp/tmp5rCvBCcipd_test/infra_python/infra/tools/send_ts_mon_values/common.py", line 100, in get_arguments
    ts_mon.add_argparse_options(parser)
  File "/private/tmp/tmp5rCvBCcipd_test/infra_python/.cipd/pkgs/infra_python_mac-amd64-mac10_9_Tl9ixxwAAW/3f066a590b1803402432e4f7aa1bc2d401b59140/ENV/lib/python2.7/site-packages/infra_libs/ts_mon/config.py", line 121, in add_argparse_options
    region = _default_region(fqdn)
  File "/private/tmp/tmp5rCvBCcipd_test/infra_python/.cipd/pkgs/infra_python_mac-amd64-mac10_9_Tl9ixxwAAW/3f066a590b1803402432e4f7aa1bc2d401b59140/ENV/lib/python2.7/site-packages/infra_libs/ts_mon/config.py", line 41, in _default_region
    timeout=1.0)
  File "/private/tmp/tmp5rCvBCcipd_test/infra_python/.cipd/pkgs/infra_python_mac-amd64-mac10_9_Tl9ixxwAAW/3f066a590b1803402432e4f7aa1bc2d401b59140/ENV/lib/python2.7/site-packages/requests/api.py", line 65, in get
    return request('get', url, **kwargs)
  File "/private/tmp/tmp5rCvBCcipd_test/infra_python/.cipd/pkgs/infra_python_mac-amd64-mac10_9_Tl9ixxwAAW/3f066a590b1803402432e4f7aa1bc2d401b59140/ENV/lib/python2.7/site-packages/requests/api.py", line 48, in request
    session = sessions.Session()
  File "/private/tmp/tmp5rCvBCcipd_test/infra_python/.cipd/pkgs/infra_python_mac-amd64-mac10_9_Tl9ixxwAAW/3f066a590b1803402432e4f7aa1bc2d401b59140/ENV/lib/python2.7/site-packages/requests_cache/core.py", line 187, in __init__
    **backend_options
  File "/private/tmp/tmp5rCvBCcipd_test/infra_python/.cipd/pkgs/infra_python_mac-amd64-mac10_9_Tl9ixxwAAW/3f066a590b1803402432e4f7aa1bc2d401b59140/ENV/lib/python2.7/site-packages/requests_cache/core.py", line 68, in __init__
    backend_options)
  File "/private/tmp/tmp5rCvBCcipd_test/infra_python/.cipd/pkgs/infra_python_mac-amd64-mac10_9_Tl9ixxwAAW/3f066a590b1803402432e4f7aa1bc2d401b59140/ENV/lib/python2.7/site-packages/requests_cache/backends/__init__.py", line 41, in create_backend
    return registry[backend_name](cache_name, **options)
  File "/private/tmp/tmp5rCvBCcipd_test/infra_python/.cipd/pkgs/infra_python_mac-amd64-mac10_9_Tl9ixxwAAW/3f066a590b1803402432e4f7aa1bc2d401b59140/ENV/lib/python2.7/site-packages/requests_cache/backends/sqlite.py", line 28, in __init__
    self.responses = DbPickleDict(location + extension, 'responses', fast_save=fast_save)
  File "/private/tmp/tmp5rCvBCcipd_test/infra_python/.cipd/pkgs/infra_python_mac-amd64-mac10_9_Tl9ixxwAAW/3f066a590b1803402432e4f7aa1bc2d401b59140/ENV/lib/python2.7/site-packages/requests_cache/backends/storage/dbdict.py", line 59, in __init__
    con.execute("create table if not exists `%s` (key PRIMARY KEY, value)" % self.table_name)
OperationalError: disk I/O error

What is the expected result?
Build should be resilient to environment issues.

What happens instead of that?
Build failed, tree closed.

Not sure if this belongs in CIPD or if we should be detecting environment errors to retry at another level.