Docker: Test crashes agent process while attempting to run tests on qtbase

agent:2019/02/05 09:12:10 build.go:192: PASS   : tst_QNetworkRequest::cleanupTestCase()
agent:2019/02/05 09:12:10 build.go:192: Totals: 89 passed, 0 failed, 0 skipped, 0 blacklisted, 15ms
agent:2019/02/05 09:12:10 build.go:192: ********* Finished testing of tst_QNetworkRequest *********
agent:2019/02/05 09:12:10 build.go:655: 
agent:2019/02/05 09:12:10 build.go:449: Executing instruction 610 of 982 - SetExecutionPhaseName
agent:2019/02/05 09:12:10 build.go:655: 
agent:2019/02/05 09:12:10 build.go:449: Executing instruction 611 of 982 - RunQtUnitTest
agent:2019/02/05 09:12:10 runner.go:72: Generating test results with TESTARGS=-o C:\Users\qt\work\testresults\tests\auto\network\access\qnetworkreply\test630580202,xml -o -,txt
agent:2019/02/05 09:12:10 build.go:314: [c:\users\qt\MSVC2017.bat jom check] 900 900
agent:2019/02/05 09:12:10 build.go:192: 
agent:2019/02/05 09:12:10 build.go:192: C:\Users\qt\work\qt\qtbase\tests\auto\network\access\qnetworkreply\test>call "C:\Program Files (x86)\Microsoft Visual Studio\2017\Professio
nal\VC\Auxiliary\Build\vcvarsall.bat" amd64  
agent:2019/02/05 09:12:11 build.go:192: **********************************************************************
agent:2019/02/05 09:12:11 build.go:192: ** Visual Studio 2017 Developer Command Prompt v15.4.0
agent:2019/02/05 09:12:11 build.go:192: ** Copyright (c) 2017 Microsoft Corporation
agent:2019/02/05 09:12:11 build.go:192: **********************************************************************
agent:2019/02/05 09:12:12 build.go:192: [vcvarsall.bat] Environment initialized for: 'x64'
agent:2019/02/05 09:12:12 build.go:192: 
agent:2019/02/05 09:12:12 build.go:192: jom 1.1.2 - empower your cores
agent:2019/02/05 09:12:12 build.go:192: 
agent:2019/02/05 09:12:12 build.go:192:         C:\Utils\Jom\jom.exe -f Makefile.Release check
agent:2019/02/05 09:12:12 build.go:192:         echo docker-compose version 1.20.1, build 5d8c71b2 && PowerShell -noprofile if ([String]::IsNullOrEmpty("\"C:/Users/qt/work/qt/qtba
se/tests/testserver/docker-compose-for-windows.yml\"")) {Write-Error "\"Project variable 'TESTSERVER_COMPOSE_FILE' is not set\""} && PowerShell -noprofile if (!(docker-machine ls 
-q --filter Name=^qt-test-server$)) {Write-Error "\"Docker machine qt-test-server not found\""} && PowerShell -noprofile if (!(docker-machine ls -q --filter State=Running --filter
 Name=^qt-test-server$)) {docker-machine start qt-test-server; docker-machine regenerate-certs -f qt-test-server} && PowerShell -noprofile if (!(docker (docker-machine config qt-t
est-server) images -aq qt-test-server-*)) {Write-Error "\"Docker image qt-test-server-* not found\""}
agent:2019/02/05 09:12:12 build.go:192: docker-compose version 1.20.1, build 5d8c71b2 
agent:2019/02/05 09:12:18 build.go:192: Starting "qt-test-server"...
agent:2019/02/05 09:12:18 build.go:192: (qt-test-server) Check network to re-create if needed...
agent:2019/02/05 09:12:18 build.go:192: (qt-test-server) Windows might ask for the permission to configure a dhcp server. Sometimes, such confirmation window is minimized in the t
askbar.
2019-02-05 09:13:11,268 WARNING: The same agent (1550366700-2743, RpcServiceAddress(hostName='10.225.248.82', port=49701)), called agentLaunched twice, that should not happen, forcefully restarting this workitem (qt/qtbase/a8c298bf574aaaa24860f490a6a762f00b58047b/WindowsWindows_10x86_64WindowsWindows_10x86_64MSVC2017qtci-windows-10-x86_64-10-141e7aDebugAndRelease_Release_ForceDebugInfo_OpenGLDynamic/2a48a3b7dcb9652b1532a3ad14de7580b5b9b1ee/Test)