net_unittests have failed on Mac-10.10 builder:

https://uberchromegw.corp.google.com/i/chromium.mac/builders/Mac10.10%20Tests

The two latest builds:

https://uberchromegw.corp.google.com/i/chromium.mac/builders/Mac10.10%20Tests/builds/30244
https://uberchromegw.corp.google.com/i/chromium.mac/builders/Mac10.10%20Tests/builds/30245

For example:

[ RUN      ] SSLClientSocketReadTest.Read/0
[E2018-03-15T06:42:06.532107-07:00 29490 0 config.go:310] Failed to get runtime information:
         {"error":"exit status 1"}
[E2018-03-15T06:42:06.532534-07:00 29490 0 annotate.go:242] original error: exit status 1
[E2018-03-15T06:42:06.532577-07:00 29490 0 annotate.go:242] 
[E2018-03-15T06:42:06.532615-07:00 29490 0 annotate.go:242] goroutine 1:
[E2018-03-15T06:42:06.532642-07:00 29490 0 annotate.go:242] #0 go.chromium.org/luci/vpython/venv/config.go:311 - venv.fillRuntime()
[E2018-03-15T06:42:06.532672-07:00 29490 0 annotate.go:242]   reason: failed to get runtime information
[E2018-03-15T06:42:06.532706-07:00 29490 0 annotate.go:242] 
[E2018-03-15T06:42:06.532740-07:00 29490 0 annotate.go:242] #1 go.chromium.org/luci/vpython/venv/config.go:194 - venv.(*Config).makeEnv()
[E2018-03-15T06:42:06.532768-07:00 29490 0 annotate.go:242] #2 go.chromium.org/luci/vpython/venv/venv.go:150 - venv.With()
[E2018-03-15T06:42:06.532795-07:00 29490 0 annotate.go:242]   reason: failed to initialize empty probe environment
[E2018-03-15T06:42:06.532819-07:00 29490 0 annotate.go:242] 
[E2018-03-15T06:42:06.532852-07:00 29490 0 annotate.go:242] #3 go.chromium.org/luci/vpython/run.go:63 - vpython.Run()
[E2018-03-15T06:42:06.532887-07:00 29490 0 annotate.go:242] #4 go.chromium.org/luci/vpython/application/application.go:318 - application.(*application).mainImpl()
[E2018-03-15T06:42:06.532918-07:00 29490 0 annotate.go:242] #5 go.chromium.org/luci/vpython/application/application.go:402 - application.(*Config).Main.func1()
[E2018-03-15T06:42:06.532951-07:00 29490 0 annotate.go:242] #6 go.chromium.org/luci/vpython/application/support.go:47 - application.run()
[E2018-03-15T06:42:06.532977-07:00 29490 0 annotate.go:242] #7 go.chromium.org/luci/vpython/application/application.go:401 - application.(*Config).Main()
[E2018-03-15T06:42:06.533008-07:00 29490 0 annotate.go:242] #8 vpython/main.go:92 - main.mainImpl()
[E2018-03-15T06:42:06.533036-07:00 29490 0 annotate.go:242] #9 vpython/main.go:98 - main.main()
[E2018-03-15T06:42:06.533062-07:00 29490 0 annotate.go:242] #10 runtime/proc.go:195 - runtime.main()
[E2018-03-15T06:42:06.533086-07:00 29490 0 annotate.go:242] #11 runtime/asm_amd64.s:2337 - runtime.goexit()
[29483:779:0315/064206.535424:15668301511308:ERROR:local_test_server_posix.cc(168)] Could not read server_data_len
[29483:779:0315/064206.535886:15668301947879:ERROR:ssl_client_socket_unittest.cc(855)] Could not start SpawnedTestServer
../../net/socket/ssl_client_socket_unittest.cc:1336: Failure
Value of: StartTestServer(SpawnedTestServer::SSLOptions())
  Actual: false
Expected: true

[ RUN      ] HTTPSCRLSetTest.CRLSetRevokedBySubject
[18774:779:0315/062228.748569:7780141209159:ERROR:local_test_server_posix.cc(81)] poll() timed out; bytes_read=0
[18774:779:0315/062228.748913:7780141538466:ERROR:local_test_server_posix.cc(168)] Could not read server_data_len
../../net/url_request/url_request_unittest.cc:10732: Failure
Value of: test_server.Start()
  Actual: false
Expected: true
../../net/url_request/url_request_unittest.cc:10754: Failure
Expected: DoConnectionWithDelegate(ssl_options, &d, &ssl_info) doesn't generate new fatal failures in the current thread.
  Actual: it does.
../../net/url_request/url_request_unittest.cc:11866: Failure
Expected equality of these values:
  CERT_STATUS_REVOKED
    Which is: 64
  cert_status & CERT_STATUS_ALL_ERRORS
    Which is: 0
[18774:779:0315/062238.763580:7790156660015:ERROR:local_test_server_posix.cc(81)] poll() timed out; bytes_read=0
[18774:779:0315/062238.763639:7790156708413:ERROR:local_test_server_posix.cc(168)] Could not read server_data_len
../../net/url_request/url_request_unittest.cc:10732: Failure
Value of: test_server.Start()
  Actual: false
Expected: true
../../net/url_request/url_request_unittest.cc:10754: Failure
Expected: DoConnectionWithDelegate(ssl_options, &d, &ssl_info) doesn't generate new fatal failures in the current thread.
  Actual: it does.
[  FAILED  ] HTTPSCRLSetTest.CRLSetRevokedBySubject (20028 ms)
[25439/25440] HTTPSCRLSetTest.CRLSetRevokedBySubject (20028 ms)

[ RUN      ] HTTPSCRLSetTest.CRLSetRevoked
[18807:779:0315/062249.389250:7800782782464:ERROR:local_test_server_posix.cc(81)] poll() timed out; bytes_read=0
[18807:779:0315/062249.389511:7800783026231:ERROR:local_test_server_posix.cc(168)] Could not read server_data_len
../../net/url_request/url_request_unittest.cc:10732: Failure
Value of: test_server.Start()
  Actual: false
Expected: true
../../net/url_request/url_request_unittest.cc:10754: Failure
Expected: DoConnectionWithDelegate(ssl_options, &d, &ssl_info) doesn't generate new fatal failures in the current thread.
  Actual: it does.
../../net/url_request/url_request_unittest.cc:11839: Failure
Expected equality of these values:
  CERT_STATUS_REVOKED
    Which is: 64
  cert_status & CERT_STATUS_ALL_ERRORS
    Which is: 0
[  FAILED  ] HTTPSCRLSetTest.CRLSetRevoked (10021 ms)