FLAKE: many Windows tests: assertion failed: grpc_server_add_insecure_http2_port

[markdroth]

https://source.cloud.google.com/results/invocations/f3b97664-dace-49cd-a3ab-5b89b4110564/targets/%2F%2Ftest%2Fcore%2Fend2end:h2_proxy_nosec_test@ping_pong_streaming/log

I1015 15:04:59.027000000 10768 test/core/end2end/tests/ping_pong_streaming.cc:37] Running test: test_pingpong_streaming/chttp2/fullstack+proxy
D1015 15:04:59.027000000 10768 test/core/end2end/fixtures/proxy.cc:97] PROXY ADDR:localhost:5985 BACKEND:localhost:5986
E1015 15:04:59.051000000 10768 src/core/ext/transport/chttp2/server/insecure/server_chttp2.cc:40] {"created":"@1571151899.051000000","description":"No address added out of total 2 resolved","file":"src/core/ext/transport/chttp2/server/chttp2_server.cc","file_line":394,"referenced_errors":[{"created":"@1571151899.051000000","description":"Failed to add port to server","file":"src/core/lib/iomgr/tcp_server_windows.cc","file_line":510,"referenced_errors":[{"created":"@1571151899.051000000","description":"OS Error","file":"src/core/lib/iomgr/tcp_server_windows.cc","file_line":201,"os_error":"An attempt was made to access a socket in a way forbidden by its access permissions.\r\n","syscall":"bind","wsa_error":10013}]},{"created":"@1571151899.051000000","description":"Failed to add port to server","file":"src/core/lib/iomgr/tcp_server_windows.cc","file_line":510,"referenced_errors":[{"created":"@1571151899.051000000","description":"OS Error","file":"src/core/lib/iomgr/tcp_server_windows.cc","file_line":201,"os_error":"An attempt was made to access a socket in a way forbidden by its access permissions.\r\n","syscall":"bind","wsa_error":10013}]}]}
E1015 15:04:59.053000000 10768 test/core/end2end/fixtures/h2_proxy.cc:44] assertion failed: grpc_server_add_insecure_http2_port(s, port)
Abort handler called.
*** 0: 00007FF759196BEC  - 0000000000000000
*** 1: 00007FF7591967F3  - 0000000000000000
*** 2: 00007FFBDDA8D09B raise - 00007FFBDDA8CEC0
*** 3: 00007FFBDDA8E131 abort - 00007FFBDDA8E100
*** 4: 00007FF759081A1A abort - 00007FFBDDA8E100
*** 5: 00007FF7590C8679 abort - 00007FFBDDA8E100
*** 6: 00007FF759081AF2 abort - 00007FFBDDA8E100
*** 7: 00007FF7590AB166 abort - 00007FFBDDA8E100
*** 8: 00007FF7590AB0B3 abort - 00007FFBDDA8E100
*** 9: 00007FF75908CFA4 abort - 00007FFBDDA8E100
*** 10: 00007FF759081CE3 abort - 00007FFBDDA8E100
*** 11: 00007FF7592303FD abort - 00007FFBDDA8E100
*** 12: 00007FFBE2C54034 BaseThreadInitThunk - 00007FFBE2C54020
*** 13: 00007FFBF6AD3691 RtlUserThreadStart - 00007FFBF6AD3670

[jtattermusch]

The rootcause seems to be Error","file":"src/core/lib/iomgr/tcp_server_windows.cc","file_line":201,"os_error":"An attempt was made to access a socket in a way forbidden by its access permissions.\r\n","syscall":"bind","wsa_error":10013

[jtattermusch]

Other occurrences:
https://source.cloud.google.com/results/invocations/de08fc92-3aaa-4397-8d67-f0e399c1fd57/targets/%2F%2Ftest%2Fcore%2Fend2end:h2_proxy_nosec_test@simple_request/log
https://source.cloud.google.com/results/invocations/2f3c586b-f47a-4280-a9f0-c47611240dba/targets/%2F%2Ftest%2Fcore%2Fend2end:h2_proxy_nosec_test@idempotent_request/log
https://source.cloud.google.com/results/invocations/ecf08992-04f0-4e36-a341-a53479299fd5/targets/%2F%2Ftest%2Fcore%2Fend2end:h2_proxy_nosec_test@invoke_large_request/log

[jtattermusch]

Hopefully this will be fixed by #22363.

[jtattermusch]

#22363 was merged.