Dear Apple Developer
[Background] We are developing a service running on test mode based on XCTest Framework to support streaming, remote and automation testing with iOS devices.
After we upgrade macOS Sonama and Xcode 15 version for upgrade XCTest for support iOS 17 around Jan-2024, we saw
We noticed that our running on test mode services stuck and hanging frequently after a period of time.
We have investigate and tried debug code and we found that main thread stuck and hanging when it call requesting snapshot of accessibility hierarchy for app. At the same time, we noticed that the application we were testing stuck and hanging too.
[Environment] Application testing: Tiktok MacOS: Sonoma 14.5 Xcode: Version 15.4 (15F31d) Device test: iPhone 12 (iOS 14.8.1)
Log detail:
t = 1524.15s Wait for com.ss.iphone.ugc.Ame to idle
t = 1536.54s Find the Application 'com.ss.iphone.ugc.Ame'
t = 1536.54s Requesting snapshot of accessibility hierarchy for app with pid 509
t = 1597.56s Find the Application 'com.ss.iphone.ugc.Ame' (retry 1)
t = 1597.56s Requesting snapshot of accessibility hierarchy for app with pid 509
t = 1658.58s Find the Application 'com.ss.iphone.ugc.Ame' (retry 2)
t = 1658.58s Requesting snapshot of accessibility hierarchy for app with pid 509
t = 1718.58s Collecting extra data to assist test failure triage
t = 1718.58s Requesting snapshot of accessibility hierarchy for app with pid 509
t = 1778.59s Requesting snapshot of accessibility hierarchy for app with pid 509
2024-08-19 14:16:44.990260+0700 WebDriverAgentRunner-Runner[489:97809] Issue type: 0
2024-08-19 14:16:44.990428+0700 WebDriverAgentRunner-Runner[489:97809] Enqueue Failure: Failed to get matching snapshot: XCTPerformOnMainRunLoop work timed out after 60.0s ((null)) (null) 0 0
t = 1843.71s Find the Application 'com.ss.iphone.ugc.Ame'
t = 1843.71s Requesting snapshot of accessibility hierarchy for app with pid 509
t = 1874.72s Find the Application 'com.ss.iphone.ugc.Ame' (retry 1)
t = 1874.72s Requesting snapshot of accessibility hierarchy for app with pid 509
t = 1940.76s Find the Application 'com.ss.iphone.ugc.Ame' (retry 2)
t = 1940.77s Requesting snapshot of accessibility hierarchy for app with pid 509
t = 2005.80s Collecting extra data to assist test failure triage
t = 2005.80s Requesting snapshot of accessibility hierarchy for app with pid 509
t = 2066.58s Requesting snapshot of accessibility hierarchy for app with pid 509
2024-08-19 14:21:33.019582+0700 WebDriverAgentRunner-Runner[489:97809] Issue type: 0
2024-08-19 14:21:33.019687+0700 WebDriverAgentRunner-Runner[489:97809] Enqueue Failure: Failed to get matching snapshot: Unable to perform work on main run loop, process main thread busy for 30.0s ((null)) (null) 0 0
2024-08-19 14:21:33.020647+0700 WebDriverAgentRunner-Runner[489:97809] Issue type: 0
2024-08-19 14:21:33.020722+0700 WebDriverAgentRunner-Runner[489:97809] Enqueue Failure: No element snapshot found for Application 'com.ss.iphone.ugc.Ame'[0.00, 0.00] -> (200.0, 259.0) ((null)) (null) 0 0
2024-08-19 14:21:33.020801+0700 WebDriverAgentRunner-Runner[489:97809] *** Assertion failure in -[XCPointerEventPath initForTouchAtPoint:offset:], XCSynthesizedEventRecord.m:263
t = 2291.08s Find the Application 'com.ss.iphone.ugc.Ame'
t = 2291.08s Requesting snapshot of accessibility hierarchy for app with pid 509
t = 2352.10s Find the Application 'com.ss.iphone.ugc.Ame' (retry 1)
t = 2352.10s Requesting snapshot of accessibility hierarchy for app with pid 509
t = 2413.11s Find the Application 'com.ss.iphone.ugc.Ame' (retry 2)
t = 2413.11s Requesting snapshot of accessibility hierarchy for app with pid 509
t = 2473.12s Collecting extra data to assist test failure triage
t = 2473.12s Requesting snapshot of accessibility hierarchy for app with pid 509
t = 2533.13s Requesting snapshot of accessibility hierarchy for app with pid 509
2024-08-19 14:29:19.552744+0700 WebDriverAgentRunner-Runner[489:97809] Issue type: 0
2024-08-19 14:29:19.553054+0700 WebDriverAgentRunner-Runner[489:97809] Enqueue Failure: Failed to get matching snapshot: XCTPerformOnMainRunLoop work timed out after 60.0s ((null)) (null) 0 0
t = 2598.27s Find the Application 'com.ss.iphone.ugc.Ame'
t = 2598.28s Requesting snapshot of accessibility hierarchy for app with pid 509
t = 2659.29s Find the Application 'com.ss.iphone.ugc.Ame' (retry 1)
t = 2659.29s Requesting snapshot of accessibility hierarchy for app with pid 509
t = 2720.31s Find the Application 'com.ss.iphone.ugc.Ame' (retry 2)
t = 2720.32s Requesting snapshot of accessibility hierarchy for app with pid 509
t = 2780.33s Collecting extra data to assist test failure triage
t = 2780.33s Requesting snapshot of accessibility hierarchy for app with pid 509
t = 2840.34s Requesting snapshot of accessibility hierarchy for app with pid 509
2024-08-19 14:34:26.806686+0700 WebDriverAgentRunner-Runner[489:97809] Issue type: 0
2024-08-19 14:34:26.806828+0700 WebDriverAgentRunner-Runner[489:97809] Enqueue Failure: Failed to get matching snapshot: XCTPerformOnMainRunLoop work timed out after 60.0s ((null)) (null) 0 0
2024-08-19 14:34:26.808114+0700 WebDriverAgentRunner-Runner[489:97809] Issue type: 0
2024-08-19 14:34:26.808205+0700 WebDriverAgentRunner-Runner[489:97809] Enqueue Failure: No element snapshot found for Application 'com.ss.iphone.ugc.Ame'[0.00, 0.00] -> (200.0, 259.0) ((null)) (null) 0 0
2024-08-19 14:34:26.809241+0700 WebDriverAgentRunner-Runner[489:97809] *** Assertion failure in -[XCPointerEventPath initForTouchAtPoint:offset:], XCSynthesizedEventRecord.m:263
