Hi guys, I have more than 2000 users that have their app blocked because we submitted an update some days ago and now the app is no longer opening for them! It's kinda strange to test, we have the same devices and the error rate is less than 1% (we have around 5M users), but the errors seems when we try to load a new instance of WKWebView, and getting some data from crashlytics this is the error: com.apple.main-thread 0 libsystem_kernel.dylib 0x16cc stat + 8 1 libsystem_kernel.dylib 0x16cc stat64 + 8 2 Foundation 0x2908c -[NSFileManager fileExistsAtPath:isDirectory:] + 92 3 Foundation 0x27f38 -[NSURL(NSURL) initFileURLWithPath:] + 156 4 Foundation 0x27e90 +[NSURL(NSURL) fileURLWithPath:] + 28 5 CoreUI 0x5b6d0 +[CUIDesignLibraryCatalog catalogForDesignSystem:colorScheme:contrast:styling:error:] + 264 6 CoreUI 0x5bfa4 +[CUIDesignLibraryCompositeCatalog _catalogsForDesignSystem:colorScheme:contrast:styling:error:] + 100 7 CoreUI 0x5c214 +[CUIDesignLibraryCompositeCatalog compositeCatalogForDesignSystem:colorScheme:contrast:styling:error:] + 168 8 CoreUI 0x3b008 +[CUIDesignLibrary colorWithName:designSystem:palette:colorScheme:contrast:styling:displayGamut:error:] + 108 9 CoreUI 0x3af90 +[CUIDesignLibrary colorWithTraits:error:] + 44 10 UIKitCore 0x95812c -[UIDynamicCatalogSystemColor _resolvedColorWithTraitCollection:] + 296 11 UIKitCore 0x63ec8 -[UIDynamicColor CGColor] + 56 12 WebCore 0xd82368 <redacted> + 68 13 WebCore 0xd7a610 WebCore::RenderThemeIOS::cssValueToSystemColorMap() + 336 14 WebKit 0x3dc7a4 <redacted> + 1280 15 WebKit 0x55ff00 <redacted> + 1912 16 WebKit 0x560868 <redacted> + 292 17 WebKit 0x562238 <redacted> + 848 18 WebKit 0x562484 <redacted> + 296 19 WebKit 0x5e84 <redacted> + 64 20 WebKit 0x5e18 <redacted> + 160 21 WebKit 0x42ec <redacted> + 972 22 WebKit 0x3f0c <redacted> + 68 23 PROJECT 0xbac4 ViewController.initializeWebView() + 308 (ViewController.swift:308) 24 PROJECT 0xaaec ViewController.mountWebView() + 210 (ViewController.swift:210) 25 PROJECT 0xa19c ViewController.viewWillAppear(_:) + 157 (ViewController.swift:157) 26 PROJECT 0xa1dc @objc ViewController.viewWillAppear(_:) + 40 (<compiler-generated>:40) 27 UIKitCore 0xc880 -[UIViewController _setViewAppearState:isAnimating:] + 612 28 UIKitCore 0xa66a8 -[UIViewController __viewWillAppear:] + 100 29 UIKitCore 0x1914cc -[UINavigationController _startTransition:fromViewController:toViewController:] + 588 30 UIKitCore 0x1907ec -[UINavigationController _startDeferredTransitionIfNeeded:] + 604 31 UIKitCore 0x18fe78 -[UINavigationController __viewWillLayoutSubviews] + 92 32 UIKitCore 0x18fde0 -[UILayoutContainerView layoutSubviews] + 168 33 UIKitCore 0x47a8 -[UIView(CALayerDelegate) layoutSublayersOfLayer:] + 1932 34 QuartzCore 0x960c CA::Layer::layout_if_needed(CA::Transaction*) + 496 35 QuartzCore 0x1bf2c CA::Layer::layout_and_display_if_needed(CA::Transaction*) + 144 36 QuartzCore 0x2c9f0 CA::Context::commit_transaction(CA::Transaction*, double, double*) + 456 37 QuartzCore 0x59dc0 CA::Transaction::commit() + 644 38 QuartzCore 0x44dbc CA::Transaction::flush_as_runloop_observer(bool) + 84 39 CoreFoundation 0x898e8 __CFRUNLOOP_IS_CALLING_OUT_TO_AN_OBSERVER_CALLBACK_FUNCTION__ + 32 40 CoreFoundation 0x1951c __CFRunLoopDoObservers + 552 41 CoreFoundation 0x75214 __CFRunLoopRun + 1004 42 CoreFoundation 0x79d20 CFRunLoopRunSpecific + 584 43 GraphicsServices 0x1998 GSEventRunModal + 160 44 UIKitCore 0x37180c -[UIApplication _run] + 868 45 UIKitCore 0x371484 UIApplicationMain + 312 46 PROJECT 0x3bba8 main + 21 (AppDelegate.swift:21) 47 ??? 0x1f123c344 (Missing) Our eng team has tried like 2 weeks to identify the root cause, but we can only say the only thing that changed, was the user of webkit in a newer version! We are able to see data with ios 16.x.x and some minor with ios 15.x.x, and iphone X, 6s, 7, 8, 11, 13, 13 Pro Max any help would be needed!
Hi Raiam, thanks for posting. Can you also share whether you have seen similar crashes with iOS 17. Additionally, do you have these with latest iOS 16.7.4 version as well? Only WebKit component is following: 13 WebCore 0xd7a610 WebCore::RenderThemeIOS::cssValueToSystemColorMap() + 336 https://searchfox.org/wubkat/rev/2cb2f84b68df8a519e252d535de43e7d19567883/Source/WebCore/rendering/RenderThemeIOS.h#52 But nothing much. @ap - should this be also raised in parallel to 'Apple Feedback' app?
Hi Saleem not a single crash in ios 17, only in 16.x, and indeed, the crash stack trace was from 16.7.4
(In reply to Raiam Quesada from comment #2) > Hi Saleem > > not a single crash in ios 17, only in 16.x, and indeed, the crash stack > trace was from 16.7.4 Thanks a lot for sharing the information. Appreciate it.
Can you share link to your app and also version (where these crashes are reproducible)? Last Good Version - x First Bad Version - where these crashes are happening Also any change logs from your app between x and y version to give any potential hint?
sure, our app is https://apps.apple.com/cr/app/cardiogram-heart-rate-monitor/id1000017994 we started facing this issue 2 version behind, where we did a rebranding and had to compile/generate a new build with latest xcode, had to update libraries and so on! before this, everything was working normally on every iOS! 3.7.21 was the latest working perfectly crashes started 3.7.23! and again, the issues are more than 2k, but it's not really common to reproduce, my team and QA team has tried to reproduce it but no luck, but we have many users complaining about it, and analytics shows the errors indeed happening! this is another variant of the "same issue", and I say same issue because its happening in the very same line of our code, the stack trace is the one a bit different com.apple.main-thread 0 ??? 0x1b658d50c (Missing) 1 ??? 0x1b658d4f8 (Missing) 2 ??? 0x1b653f6a0 (Missing) 3 ??? 0x1b653eaac (Missing) 4 WebKit 0x1c488c invocation function for block in WebKit::get_TCC_kTCCServiceMicrophone() + 28 5 libdispatch.dylib 0x3fdc _dispatch_client_callout + 20 6 libdispatch.dylib 0x5828 _dispatch_once_callout + 32 7 WebKit 0x1c486c WebKit::get_TCC_kTCCServiceMicrophone() + 64 8 WebKit 0x3d6df8 WebKit::checkUsageDescriptionStringForType(WebKit::MediaPermissionType) + 272 9 WebKit 0x4111a0 WebKit::WebPreferences::platformInitializeStore() + 72 10 WebKit 0x60d2a8 WebKit::WebPreferences::WebPreferences(WTF::String const&, WTF::String const&, WTF::String const&) + 204 11 WebKit 0x60d04c WebKit::WebPreferences::createWithLegacyDefaults(WTF::String const&, WTF::String const&, WTF::String const&) + 72 12 WebKit 0x5d1c24 WebKit::WebPageGroup::WebPageGroup(WTF::String const&) + 276 13 WebKit 0x60f188 WebKit::WebProcessPool::WebProcessPool(API::ProcessPoolConfiguration&) + 204 14 WebKit 0x2dec -[WKProcessPool _initWithConfiguration:] + 80 15 WebKit 0xb48c -[WKProcessPool init] + 48 16 WebKit 0x4d04 -[WKWebViewConfiguration processPool] + 56 17 WebKit 0x49f8 -[WKWebViewConfiguration copyWithZone:] + 112 18 WebKit 0x3f40 -[WKWebView _initializeWithConfiguration:] + 140 19 WebKit 0x3ea0 -[WKWebView initWithFrame:configuration:] + 72 20 PROJECT-11 0xbac4 ViewController.initializeWebView() + 308 (ViewController.swift:308) 21 PROJECT-11 0xaaec ViewController.mountWebView() + 210 (ViewController.swift:210) 22 PROJECT-11 0xa19c ViewController.viewWillAppear(_:) + 157 (ViewController.swift:157) 23 PROJECT-11 0xa1dc @objc ViewController.viewWillAppear(_:) + 40 (<compiler-generated>:40) 24 UIKitCore 0xd500 -[UIViewController _setViewAppearState:isAnimating:] + 612 25 UIKitCore 0xb1d94 -[UIViewController __viewWillAppear:] + 116 26 UIKitCore 0x1a8778 -[UINavigationController _startTransition:fromViewController:toViewController:] + 592 27 UIKitCore 0x1a7aa4 -[UINavigationController _startDeferredTransitionIfNeeded:] + 608 28 UIKitCore 0x1a70f4 -[UINavigationController __viewWillLayoutSubviews] + 96 29 UIKitCore 0x1a7058 -[UILayoutContainerView layoutSubviews] + 172 30 UIKitCore 0x4cec -[UIView(CALayerDelegate) layoutSublayersOfLayer:] + 1980 31 QuartzCore 0xa4e8 CA::Layer::layout_if_needed(CA::Transaction*) + 500 32 QuartzCore 0x1db9c CA::Layer::layout_and_display_if_needed(CA::Transaction*) + 148 33 QuartzCore 0x2f098 CA::Context::commit_transaction(CA::Transaction*, double, double*) + 456 34 QuartzCore 0x663c4 CA::Transaction::commit() + 652 35 QuartzCore 0x4d408 CA::Transaction::flush_as_runloop_observer(bool) + 88 36 UIKitCore 0x504fb0 _UIApplicationFlushCATransaction + 52 37 UIKitCore 0x651678 _UIUpdateSequenceRun + 84 38 UIKitCore 0xc90904 schedulerStepScheduledMainSection + 172 39 UIKitCore 0xc8fad0 runloopSourceCallback + 92 40 CoreFoundation 0xd622c __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ + 28 41 CoreFoundation 0xe2614 __CFRunLoopDoSource0 + 176 42 CoreFoundation 0x6657c __CFRunLoopDoSources0 + 340 43 CoreFoundation 0x7beb8 __CFRunLoopRun + 836 44 CoreFoundation 0x811e4 CFRunLoopRunSpecific + 612 45 GraphicsServices 0x1368 GSEventRunModal + 164 46 UIKitCore 0x3a2d88 -[UIApplication _run] + 888 47 UIKitCore 0x3a29ec UIApplicationMain + 340 48 PROJECT-11 0x3bba8 main + 21 (AppDelegate.swift:21) 49 ??? 0x1b654d948 (Missing)
Look this one: com.apple.tcc.preflight.kTCCServiceMicrophone 0 libsystem_kernel.dylib 0xb48 mach_msg2_trap + 8 1 libsystem_kernel.dylib 0x13008 mach_msg2_internal + 80 2 libsystem_kernel.dylib 0x13248 mach_msg_overwrite + 388 3 libsystem_kernel.dylib 0x108c mach_msg + 24 4 libdispatch.dylib 0x1f364 _dispatch_mach_send_and_wait_for_reply + 540 5 libdispatch.dylib 0x1f6ec dispatch_mach_send_with_result_and_wait_for_reply + 60 6 libxpc.dylib 0x102e4 xpc_connection_send_message_with_reply_sync + 240 7 TCC 0x1c20 tccd_send_message + 940 8 TCC 0x6db8 __TCCAccessRequest_block_invoke_3 + 868 9 libdispatch.dylib 0x3fdc _dispatch_client_callout + 20 10 libdispatch.dylib 0x13574 _dispatch_lane_barrier_sync_invoke_and_complete + 56 11 libsystem_trace.dylib 0x6d78 _os_activity_initiate_impl + 64 12 TCC 0x2fac TCCAccessRequest + 476 13 TCC 0x222c TCCAccessPreflight + 300 14 WebKit 0x4218d4 WebKit::checkUsageDescriptionStringForType(WebKit::MediaPermissionType) + 288 15 WebKit 0x45bfe8 WebKit::WebPreferences::platformInitializeStore() + 72 16 WebKit 0x654814 WebKit::WebPreferences::WebPreferences(WTF::String const&, WTF::String const&, WTF::String const&) + 204 17 WebKit 0x6545b8 WebKit::WebPreferences::createWithLegacyDefaults(WTF::String const&, WTF::String const&, WTF::String const&) + 72 18 WebKit 0x619c98 WebKit::WebPageGroup::WebPageGroup(WTF::String const&) + 276 19 WebKit 0x6568f4 WebKit::WebProcessPool::WebProcessPool(API::ProcessPoolConfiguration&) + 204 20 WebKit 0x3610 -[WKProcessPool _initWithConfiguration:] + 80 21 WebKit 0xbcf4 -[WKProcessPool init] + 48 22 WebKit 0x5544 -[WKWebViewConfiguration processPool] + 56 23 WebKit 0x5230 -[WKWebViewConfiguration copyWithZone:] + 112 24 WebKit 0x4770 -[WKWebView _initializeWithConfiguration:] + 140 25 WebKit 0x46d0 -[WKWebView initWithFrame:configuration:] + 72 26 Cardiogram 0xbac4 ViewController.initializeWebView() + 308 (ViewController.swift:308) 27 Cardiogram 0xaaec ViewController.mountWebView() + 210 (ViewController.swift:210) 28 Cardiogram 0xa19c ViewController.viewWillAppear(_:) + 157 (ViewController.swift:157) 29 Cardiogram 0xa1dc @objc ViewController.viewWillAppear(_:) + 40 (<compiler-generated>:40) 30 UIKitCore 0xd838 -[UIViewController _setViewAppearState:isAnimating:] + 616 31 UIKitCore 0xb14c0 -[UIViewController __viewWillAppear:] + 104 32 UIKitCore 0x1a7c88 -[UINavigationController _startTransition:fromViewController:toViewController:] + 592 33 UIKitCore 0x1a6fb4 -[UINavigationController _startDeferredTransitionIfNeeded:] + 608 34 UIKitCore 0x1a6604 -[UINavigationController __viewWillLayoutSubviews] + 96 35 UIKitCore 0x1a6568 -[UILayoutContainerView layoutSubviews] + 172 36 UIKitCore 0x5020 -[UIView(CALayerDelegate) layoutSublayersOfLayer:] + 1980 37 QuartzCore 0x99ec CA::Layer::layout_if_needed(CA::Transaction*) + 500 38 QuartzCore 0x1d0a0 CA::Layer::layout_and_display_if_needed(CA::Transaction*) + 148 39 QuartzCore 0x2e5b0 CA::Context::commit_transaction(CA::Transaction*, double, double*) + 456 40 QuartzCore 0x635ec CA::Transaction::commit() + 652 41 QuartzCore 0x4c8cc CA::Transaction::flush_as_runloop_observer(bool) + 88 42 UIKitCore 0x504b44 _UIApplicationFlushCATransaction + 52 43 UIKitCore 0x652740 _UIUpdateSequenceRun + 84 44 UIKitCore 0xc99fd0 schedulerStepScheduledMainSection + 172 45 UIKitCore 0xc9919c runloopSourceCallback + 92 46 CoreFoundation 0xd5f54 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ + 28 47 CoreFoundation 0xe232c __CFRunLoopDoSource0 + 176 48 CoreFoundation 0x66210 __CFRunLoopDoSources0 + 244 49 CoreFoundation 0x7bba8 __CFRunLoopRun + 836 50 CoreFoundation 0x80ed4 CFRunLoopRunSpecific + 612 51 GraphicsServices 0x1368 GSEventRunModal + 164 52 UIKitCore 0x3a23d0 -[UIApplication _run] + 888 53 UIKitCore 0x3a2034 UIApplicationMain + 340 54 Cardiogram 0x3bba8 main + 21 (AppDelegate.swift:21) 55 ??? 0x1a73ac960 (Missing) it's showing the issue at our same line, but with different stack trace, that is why I have ended up with no clue on what can be happening with iOS 16 (certain devices)
While I understand that this is an emergency for your users, tracking this as a WebKit bug is not appropriate. First, this doesn't affect iOS 17, so even if this were a WebKit bug, this would mean that it's already fixed. Second, the fact that this appears to have started after changes to the app suggests an issue outside iOS. Please see https://developer.apple.com/support/technical/ for how Apple provides general developer technical support. I will also note that these excerpts from crash logs look potentially misleading. Are you sure that you are looking at the stack trace of the crashing thread? The complete crash log contains information about which thread crashed.