Auto test tests/auto/webchannel crashes a lot on Windows10

agent:2019/07/09 09:59:40 build.go:207: ********* Start testing of TestWebChannel *********
agent:2019/07/09 09:59:40 build.go:207: Config: Using QtTest library 5.13.1, Qt 5.13.1 (x86_64-little_endian-llp64 shared (dynamic) release build; by MSVC 2015)
agent:2019/07/09 09:59:40 build.go:207: PASS   : TestWebChannel::initTestCase()
agent:2019/07/09 09:59:40 build.go:207: PASS   : TestWebChannel::testRegisterObjects()
agent:2019/07/09 09:59:40 build.go:207: PASS   : TestWebChannel::testDeregisterObjects()
agent:2019/07/09 09:59:40 build.go:207: PASS   : TestWebChannel::testDeregisterObjectAtStart()
agent:2019/07/09 09:59:40 build.go:207: PASS   : TestWebChannel::testInfoForObject()
agent:2019/07/09 09:59:40 build.go:207: PASS   : TestWebChannel::testInvokeMethodConversion()
agent:2019/07/09 09:59:40 build.go:207: PASS   : TestWebChannel::testSetPropertyConversion()
agent:2019/07/09 09:59:40 build.go:207: PASS   : TestWebChannel::testDisconnect()
agent:2019/07/09 09:59:40 build.go:207: PASS   : TestWebChannel::testWrapRegisteredObject()
agent:2019/07/09 09:59:40 build.go:207: PASS   : TestWebChannel::testUnwrapObject()
agent:2019/07/09 09:59:40 build.go:207: PASS   : TestWebChannel::testRemoveUnusedTransports()
agent:2019/07/09 09:59:40 build.go:207: PASS   : TestWebChannel::testPassWrappedObjectBack()
agent:2019/07/09 09:59:40 build.go:207: PASS   : TestWebChannel::testWrapValues()
agent:2019/07/09 09:59:40 build.go:207: PASS   : TestWebChannel::testWrapObjectWithMultipleTransports()
agent:2019/07/09 09:59:40 build.go:207: PASS   : TestWebChannel::testJsonToVariant()
agent:2019/07/09 09:59:40 build.go:207: PASS   : TestWebChannel::testInfiniteRecursion()
agent:2019/07/09 09:59:40 build.go:207: A crash occurred in C:\Users\qt\work\qt\qtwebchannel\tests\auto\webchannel\release\tst_webchannel.exe.
agent:2019/07/09 09:59:40 build.go:207: Function time: 75ms Total time: 98ms
agent:2019/07/09 09:59:40 build.go:207: 
agent:2019/07/09 09:59:40 build.go:207: Exception address: 0x00007FFA41D463C9
agent:2019/07/09 09:59:40 build.go:207: Exception code   : 0xc0000005
agent:2019/07/09 09:59:40 build.go:207: Nearby symbol    : QMetaObjectPublisher::deleteWrappedObject
agent:2019/07/09 09:59:40 build.go:207: 
agent:2019/07/09 09:59:40 build.go:207: Stack:
agent:2019/07/09 09:59:40 build.go:207: #  1: QTest::toString() - 0x00007FFA41B0A680
agent:2019/07/09 09:59:40 build.go:207: #  2: UnhandledExceptionFilter() - 0x00007FFA4AEB51F0
agent:2019/07/09 09:59:40 build.go:207: #  3: memset() - 0x00007FFA4E7F6440
agent:2019/07/09 09:59:40 build.go:207: #  4: _C_specific_handler() - 0x00007FFA4E7DFC90
agent:2019/07/09 09:59:40 build.go:207: #  5: _chkstk() - 0x00007FFA4E7F4560
agent:2019/07/09 09:59:40 build.go:207: #  6: RtlWalkFrameChain() - 0x00007FFA4E753730
agent:2019/07/09 09:59:40 build.go:207: #  7: KiUserExceptionDispatcher() - 0x00007FFA4E7F33C0
agent:2019/07/09 09:59:40 build.go:207: #  8: QMetaObjectPublisher::deleteWrappedObject() - 0x00007FFA41D45B10
agent:2019/07/09 09:59:40 build.go:207: #  9: QMetaObjectPublisher::objectDestroyed() - 0x00007FFA41D490D0
agent:2019/07/09 09:59:40 build.go:207: # 10: QObject::event() - 0x00007FFA2432F6E0
agent:2019/07/09 09:59:40 build.go:207: # 11: QCoreApplication::notify() - 0x00007FFA24309200
agent:2019/07/09 09:59:40 build.go:207: # 12: QCoreApplication::notifyInternal2() - 0x00007FFA24309270
agent:2019/07/09 09:59:40 build.go:207: # 13: QCoreApplicationPrivate::sendPostedEvents() - 0x00007FFA2430B160
agent:2019/07/09 09:59:40 build.go:207: # 14: QEventDispatcherWin32::processEvents() - 0x00007FFA243549C0
agent:2019/07/09 09:59:40 build.go:207: # 15: DispatchMessageW() - 0x00007FFA4DBEC3C0
agent:2019/07/09 09:59:40 build.go:207: # 16: DispatchMessageW() - 0x00007FFA4DBEC3C0
agent:2019/07/09 09:59:40 build.go:207: # 17: QEventDispatcherWin32::processEvents() - 0x00007FFA243549C0
agent:2019/07/09 09:59:40 build.go:207: # 18: QCoreApplication::processEvents() - 0x00007FFA24309940
agent:2019/07/09 09:59:40 build.go:207: # 19: QTest::qWait() - 0x00007FFA2434DA60
agent:2019/07/09 09:59:40 build.go:207: # 20: TestWebChannel::testAsyncObject() - 0x00007FF7D38C9150
agent:2019/07/09 09:59:40 build.go:207: # 21: QMetaMethod::invoke() - 0x00007FFA2430EF90
agent:2019/07/09 09:59:40 build.go:207: # 22: QMetaMethod::invoke() - 0x00007FFA24154090
agent:2019/07/09 09:59:40 build.go:207: # 23: QTest::ignoreMessage() - 0x00007FFA41B04AB0
agent:2019/07/09 09:59:40 build.go:207: # 24: QTest::ignoreMessage() - 0x00007FFA41B04AB0
agent:2019/07/09 09:59:40 build.go:207: # 25: QTest::ignoreMessage() - 0x00007FFA41B04AB0
agent:2019/07/09 09:59:40 build.go:207: # 26: QTest::qRun() - 0x00007FFA41B08B40
agent:2019/07/09 09:59:40 build.go:207: # 27: QTest::qExec() - 0x00007FFA41B06E20
agent:2019/07/09 09:59:40 build.go:207: # 28: main() - 0x00007FF7D38D0A70
agent:2019/07/09 09:59:40 build.go:207: # 29: __scrt_common_main_seh() - 0x00007FF7D38D2DA8
agent:2019/07/09 09:59:40 build.go:207: # 30: BaseThreadInitThunk() - 0x00007FFA4D987E80
agent:2019/07/09 09:59:40 build.go:207: # 31: RtlUserThreadStart() - 0x00007FFA4E7BA230
agent:2019/07/09 09:59:40 build.go:207: 
agent:2019/07/09 09:59:40 build.go:207: jom: C:\Users\qt\work\qt\qtwebchannel\tests\auto\webchannel\Makefile.Release [check] Error 2
agent:2019/07/09 09:59:40 build.go:207: jom: C:\Users\qt\work\qt\qtwebchannel\tests\auto\webchannel\Makefile [release-check] Error 2
agent:2019/07/09 09:59:40 build.go:240: Process finished with error: exit status 2
agent:2019/07/09 09:59:40 build.go:531: Executing scheduled instruction 1 of 2 - Upload all core dumps if there are some
agent:2019/07/09 09:59:40 build.go:533: 
agent:2019/07/09 09:59:40 build.go:531: Executing scheduled instruction 2 of 2 - Upload test results
agent:2019/07/09 09:59:40 storageclient.go:407: Collecting test results, archiving and uploading them
agent:2019/07/09 09:59:40 build.go:210: Error reading from stdout/err: exit status 2
agent:2019/07/09 09:59:40 result.go:177: Collecting 1 test results ...
agent:2019/07/09 09:59:41 build.go:533: 
agent:2019/07/09 09:59:41 agent.go:268: Test failed
agent:2019/07/09 09:59:41 agent.go:200: ERROR building: error unmarshalling testlib xml output ('C:\Users\qt\work\testresults\tests\auto\webchannel965688331'): 'XML syntax error on line 73: unexpected EOF'.
Most likely the test has crashed