There are a bunch of crashes in components and net unittests on devices.


All failures messages are 

Send failed, err_code=-2 bytes=0/6 Exiting.

This may indicate a network error.
After the failure and crash, idevice-app-runner fails to restart



Send failed, err_code=-2 bytes=0/6 Exiting.
idevice-app-runner returned 1

Crashed during CreditCardTest/GetCreditCardTypeTestBatch3.GetCreditCardType/7, resuming...

idevice-app-runner --udid 1580b1fff293b86ce25f9b616ab8d6d3a3a147db --start com.google.gtest.components-unittests -D GKIF_SCENARIO_FILTER=-NAME:ProfileSyncServiceTest.SignOutRevokeAccessToken|ContentSuggestionsMetricsTest.ShouldLogOnSuggestionsShown|OfflinePageHeaderTest.Parse|AutofillManagerTest.GetCreditCardSuggestions_RepeatedObfuscatedNumber|...

Too many test cases to resume.

1 tests failed and will be retried.

Retry #1 for CreditCardTest/GetCreditCardTypeTestBatch3.GetCreditCardType/7.

idevice-app-runner --udid 1580b1fff293b86ce25f9b616ab8d6d3a3a147db --start com.google.gtest.components-unittests -D GKIF_SCENARIO_FILTER=NAME:CreditCardTest/GetCreditCardTypeTestBatch3.GetCreditCardType/7 --args --gtest-filter=CreditCardTest/GetCreditCardTypeTestBatch3.GetCreditCardType/7

This program contains tests written using Google Test. You can use the
following command line flags to control its behavior:

Test Selection:
  --gtest_list_tests
      List the names of all tests instead of running them. The name of
      TEST(Foo, Bar) is "Foo.Bar".
  --gtest_filter=POSTIVE_PATTERNS[-NEGATIVE_PATTERNS]
      Run only the tests whose name matches one of the positive patterns but
      none of the negative patterns. '?' matches any single character; '*'
      matches any substring; ':' separates two patterns.
  --gtest_also_run_disabled_tests
      Run all disabled tests too.
...




Most of these tests are tests with params (TEST_P)

Example of failing tests
CreditCardTest/GetCreditCardTypeTestBatch3.GetCreditCardType/7
RlzLibTest.ReactivationNonOrganicNonOrganic
Tests/QuicHeadersStreamTest.NoConnectionLevelFlowControl/42

Example of failing runs
https://uberchromegw.corp.google.com/i/internal.bling.main/builders/iphone10-device-x64/builds/4134/steps/net_unittests%20%28iPhone%206s%20iOS%2010.0.1%29%20on%20iOS-10.0.1
https://uberchromegw.corp.google.com/i/internal.bling.main/builders/iphone10-device-x64/builds/4134/steps/components_unittests%20%28iPhone%206s%20iOS%2010.0.1%29%20on%20iOS-10.0.1
https://uberchromegw.corp.google.com/i/internal.bling.main/builders/ipad10-device-x64/builds/3835/steps/components_unittests%20%28iPad%20Air%20iOS%2010.0.1%29%20on%20iOS-10.0.1