output: ('pidDiedCallback:', [26640])

WDA 启动失败，完整日志如下：
[I 210419 11:43:49 _device:990] BundleID: com.alipay.wda.WDAMonitorUITests.xctrunner
[I 210419 11:43:49 _device:992] DeviceIdentifier: 7637fa471c326ab50de282cf7ec18511374c5994
[I 210419 11:43:49 _device:834] SignIdentity: 'Apple Development: xuefei yu (3832536FLT)'
[I 210419 11:43:49 _device:840] CFBundleExecutable: WDAMonitorUITests-Runner
[I 210419 11:43:49 _device:871] AppContainer: /private/var/mobile/Containers/Data/Application/1B76BAFF-2910-4190-A408-DFB68E93BC65
[I 210419 11:43:50 _device:911] Launch 'com.alipay.wda.WDAMonitorUITests.xctrunner' pid: 26640
[I 210419 11:43:50 _device:936] output: ('outputReceived:fromProcess:atTime:', ['2021-04-19 11:43:50.266159+0800 WDAMonitorUITests-Runner[26640:28075754] Running tests...\n', 26640, 151112095573280])
[I 210419 11:43:50 _device:936] output: ('outputReceived:fromProcess:atTime:', ['objc[26640]: Class GCDAsyncSocketPreBuffer is implemented in both /private/var/containers/Bundle/Application/CFCD03EC-255C-4113-97CD-CC506D9D4AC9/WDAMonitorUITests-Runner.app/PlugIns/WDAMonitorUITests.xctest/Frameworks/CocoaAsyncSocket.framework/CocoaAsyncSocket (0x107f9e938) and /private/var/containers/Bundle/Application/CFCD03EC-255C-4113-97CD-CC506D9D4AC9/WDAMonitorUITests-Runner.app/PlugIns/WDAMonitorUITests.xctest/Frameworks/WebDriverAgentLib.framework/WebDriverAgentLib (0x107a3c6b8). One of the two will be used. Which one is undefined.\nobjc[26640]: Class GCDAsyncReadPacket is implemented in both /private/var/containers/Bundle/Application/CFCD03EC-255C-4113-97CD-CC506D9D4AC9/WDAMonitorUITests-Runner.app/PlugIns/WDAMonitorUITests.xctest/Frameworks/CocoaAsyncSocket.framework/CocoaAsyncSocket (0x107f9e988) and /private/var/containers/Bundle/Application/CFCD03EC-255C-4113-97CD-CC506D9D4AC9/WDAMonitorUITests-Runner.app/PlugIns/WDAMonitorUITests.xctest/Frameworks/WebDriverAgentLib.framework/WebDriverAgentLib (0x107a3c708). One of the two will be used. Which one is undefined.\nobjc[26640]: Class GCDAsyncWritePacket is implemented in both /private/var/containers/Bundle/Application/CFCD03EC-255C-4113-97CD-CC506D9D4AC9/WDAMonitorUITests-Runner.app/PlugIns/WDAMonitorUITests.xctest/Frameworks/CocoaAsyncSocket.framework/CocoaAsyncSocket (0x107f9e9d8) and /private/var/containers/Bundle/Application/CFCD03EC-255C-4113-97CD-CC506D9D4AC9/WDAMonitorUITests-Runner.app/PlugIns/WDAMonitorUITests.xctest/Frameworks/WebDriverAgentLib.framework/WebDriverAgentLib (0x107a3c758). One of the two will be used. Which one is undefined.\nobjc[26640]: Class GCDAsyncSpecialPacket is implemented in both /private/var/containers/Bundle/Application/CFCD03EC-255C-4113-97CD-CC506D9D4AC9/WDAMonitorUITests-Runner.app/PlugIns/WDAMonitorUITests.xctest/Frameworks/CocoaAsyncSocket.framework/CocoaAsyncSocket (0x107f9ea28) and /private/var/containers/Bundle/Application/CFCD03EC-255C-4113-97CD-CC506D9D4AC9/WDAMonitorUITests-Runner.app/PlugIns/WDAMonitorUITests.xctest/Frameworks/WebDriverAgentLib.framework/WebDriverAgentLib (0x107a3c7a8). One of the two will be used. Which one is undefined.\nobjc[26640]: Class GCDAsyncSocket is implemented in both /private/var/containers/Bundle/Application/CFCD03EC-255C-4113-97CD-CC506D9D4AC9/WDAMonitorUITests-Runner.app/PlugIns/WDAMonitorUITests.xctest/Frameworks/CocoaAsyncSocket.framework/CocoaAsyncSocket (0x107f9ea78) and /private/var/containers/Bundle/Application/CFCD03EC-255C-4113-97CD-CC506D9D4AC9/WDAMonitorUITests-Runner.app/PlugIns/WDAMonitorUITests.xctest/Frameworks/WebDriverAgentLib.framework/WebDriverAgentLib (0x107a3c7f8). One of the two will be used. Which one is undefined.\nobjc[26640]: Class CaptureDelegate is implemented in both /private/var/containers/Bundle/Application/CFCD03EC-255C-4113-97CD-CC506D9D4AC9/WDAMonitorUITests-Runner.app/PlugIns/WDAMonitorUITests.xctest/Frameworks/WebDriverAgentLib.framework/WebDriverAgentLib (0x107a3e9b8) and /var/containers/Bundle/Application/CFCD03EC-255C-4113-97CD-CC506D9D4AC9/WDAMonitorUITests-Runner.app/PlugIns/WDAMonitorUITests.xctest/WDAMonitorUITests (0x106ff7ee0). One of the two will be used. Which one is undefined.\nobjc[26640]: Class CvAbstractCamera is implemented in both /private/var/containers/Bundle/Application/CFCD03EC-255C-4113-97CD-CC506D9D4AC9/WDAMonitorUITests-Runner.app/PlugIns/WDAMonitorUITests.xctest/Frameworks/WebDriverAgentLib.framework/WebDriverAgentLib (0x107a3ea08) and /var/containers/Bundle/Application/CFCD03EC-255C-4113-97CD-CC506D9D4AC9/WDAMonitorUITests-Runner.app/PlugIns/WDAMonitorUITests.xctest/WDAMonitorUITests (0x106ff7f30). One of the two will be used. Which one is undefined.\nobjc[26640]: Class CvPhotoCamera is implemented in both /private/var/containers/Bundle/Application/CFCD03EC-255C-4113-97CD-CC506D9D4AC9/WDAMonitorUITests-Runner.app/PlugIns/WDAMonitorUITests.xctest/Frameworks/WebDriverAgentLib.framework/WebDriverAgentLib (0x107a3ea58) and /var/containers/Bundle/Application/CFCD03EC-255C-4113-97CD-CC506D9D4AC9/WDAMonitorUITests-Runner.app/PlugIns/WDAMonitorUITests.xctest/WDAMonitorUITests (0x106ff7f80). One of the two will be used. Which one is undefined.\nobjc[26640]: Class CvVideoCamera is implemented in both /private/var/containers/Bundle/Application/CFCD03EC-255C-4113-97CD-CC506D9D4AC9/WDAMonitorUITests-Runner.app/PlugIns/WDAMonitorUITests.xctest/Frameworks/WebDriverAgentLib.framework/WebDriverAgentLib (0x107a3eaa8) and /var/containers/Bundle/Application/CFCD03EC-255C-4113-97CD-CC506D9D4AC9/WDAMonitorUITests-Runner.app/PlugIns/WDAMonitorUITests.xctest/WDAMonitorUITests (0x106ff7fd0). One of the two will be used. Which one is undefined.\nobjc[26640]: Class XNNWrapper is implemented in both /private/var/containers/Bundle/Application/CFCD03EC-255C-4113-97CD-CC506D9D4AC9/WDAMonitorUITests-Runner.app/PlugIns/WDAMonitorUITests.xctest/Frameworks/WebDriverAgentLib.framework/WebDriverAgentLib (0x107a3eaf8) and /var/containers/Bundle/Application/CFCD03EC-255C-4113-97CD-CC506D9D4AC9/WDAMonitorUITests-Runner.app/PlugIns/WDAMonitorUITests.xctest/WDAMonitorUITests (0x106ff8020). One of the two will be used. Which one is undefined.\n', 26640, 151112096702848])
[I 210419 11:43:50 _device:1086] ProductVersion: 11.4.1
[I 210419 11:43:50 _device:1033] Start execute test plan with IDE version: 29
[I 210419 11:43:50 _device:936] output: ('pidDiedCallback:', [26640])

Start at the _device launch and process-output path shown in the log, then reproduce the WDAMonitorUITests-Runner failure on the reported iOS 11.4.1 environment. Investigate why the runner exits after the duplicate-class warnings and document or fix the cause, with successful WDA startup as the completion criterion.

Written by the indexing model from the issue text.