Crash - AdMob

Unity Services
,
1

Crash when showing an AdMob ad. I realise this is probably a Google Ads issue but thought I’d provide insight since we are showing them via UnityMediation now.

CrashReporter Key:  aad8faa2cf7f5af1494e218ca01d937a12a64b7e
Hardware Model:     iPhone9,4
Process:            AliceLegends
Identifier:         com.bhe.alicelegends
Version:            3.3.0
Role:               Background
OS Version:         iOS 15.4.1
Exception Type:     EXC_BAD_ACCESS


EXC_BAD_ACCESS: Attempted to dereference garbage pointer 0x58.

0  AliceLegends       GC_is_marked (mark.c:242:17)
1  AliceLegends       GC_finish_collection (alloc.c:1084:7)
2  AliceLegends       GC_try_to_collect_inner (alloc.c:592:5)
3  AliceLegends       GC_init (misc.c:1323:9)
4  AliceLegends       GC_generic_malloc_inner (malloc.c:174:15)
5  gcj_mlc.c          GC_gcj_malloc
6  AliceLegends       il2cpp::vm::Object::NewAllocSpecific(Il2CppClass*) (Object.cpp:78:9)
7  AliceLegends       il2cpp::vm::Thread::Attach(Il2CppDomain*) (Thread.cpp:121:40)
8  AliceLegends       il2cpp::vm::ScopedThreadAttacher::ScopedThreadAttacher() (ScopedThreadAttacher.cpp:10:28)
9  AliceLegends       ReversePInvokeWrapper_IosRewardedShowListener_Closed_m1E7E7EA93868CF08856059BE30E458569D7B4DAB (Unity.Mediation.cpp:7644:35)
10 AliceLegends       -[UMSPRewardedAdShowDelegate onRewardedClosed:] (UMSPRewardedAdShowDelegate.mm:27:9)
11 UnityFramework     -[UMSRewardedAd triggerOnRewardedClosed]
12 UnityFramework     -[UMSRewardedAd onRewardedAdapterClosed]
13 UnityFramework     __36-[UMSAdmobRewardedAd show:delegate:]_block_invoke_2
14 UnityFramework     -[UMSAdmobFullScreenContentDelegate adDidDismissFullScreenContent:]
15 UnityFramework     GAD_GADRewardedAd_arm64_8_13_0
16 UnityFramework     __copy_helper_block_e8_32s40s48s56b64s
17 UnityFramework     __copy_helper_block_e8_32s40s48s56b64s
18 UnityFramework     GADPostNotification
19 Foundation         -[__NSObserver _doit:]
20 CoreFoundation     ___CFNOTIFICATIONCENTER_IS_CALLING_OUT_TO_AN_OBSERVER__
21 CoreFoundation     ____CFXRegistrationPost_block_invoke
22 CoreFoundation     __CFXRegistrationPost
23 CoreFoundation     __CFXNotificationPost
24 Foundation         -[NSNotificationCenter postNotificationName:object:userInfo:]
25 UnityFramework     GADPostNotification
26 UnityFramework     GADPostNotification
27 UnityFramework     GAD_GADIntermission_arm64_8_13_0
28 UnityFramework     GAD_GADIntermission_arm64_8_13_0
29 UnityFramework     GAD_GADIntermission_arm64_8_13_0
30 UnityFramework     GADPostNotification
31 Foundation         -[__NSObserver _doit:]
32 CoreFoundation     ___CFNOTIFICATIONCENTER_IS_CALLING_OUT_TO_AN_OBSERVER__
33 CoreFoundation     ____CFXRegistrationPost_block_invoke
34 CoreFoundation     __CFXRegistrationPost
35 CoreFoundation     __CFXNotificationPost
36 Foundation         -[NSNotificationCenter postNotificationName:object:userInfo:]
37 UnityFramework     GADPostNotification
38 UnityFramework     GADPostNotification
39 UnityFramework     GAD_GADFullScreenAdViewController_arm64_8_13_0
40 UIKitCore          -[UIViewController _setViewAppearState:isAnimating:]
41 UIKitCore          -[UIViewController __viewDidDisappear:]
42 UIKitCore          -[UIViewController _endAppearanceTransition:]
43 UIKitCore          ___48-[UIPresentationController transitionDidFinish:]_block_invoke
44 UIKitCore          -[UIPresentationController transitionDidFinish:]
45 UIKitCore          -[_UICurrentContextPresentationController transitionDidFinish:]
46 UIKitCore          ___56-[UIPresentationController runTransitionForCurrentState]_block_invoke.437
47 UIKitCore          -[_UIViewControllerTransitionContext completeTransition:]
48 UIKitCore          -[UIViewControllerBuiltinTransitionViewAnimator animateTransition:]
49 UIKitCore          ____UIViewControllerTransitioningRunCustomTransition_block_invoke_2
50 UIKitCore          +[UIKeyboardSceneDelegate _pinInputViewsForKeyboardSceneDelegate:onBehalfOfResponder:duringBlock:]
51 UIKitCore          ____UIViewControllerTransitioningRunCustomTransition_block_invoke.641
52 UIKitCore          +[UIView(Animation) _setAlongsideAnimations:toRunByEndOfBlock:]
53 UIKitCore          __UIViewControllerTransitioningRunCustomTransition
54 UIKitCore          ___56-[UIPresentationController runTransitionForCurrentState]_block_invoke.401
55 UIKitCore          +[UIPresentationController _scheduleTransition:]
56 UIKitCore          -[UIPresentationController runTransitionForCurrentState]
57 UIKitCore          -[UIPresentationController _dismissWithAnimationController:interactionController:target:didEndSelector:]
58 UIKitCore          ___99-[UIViewController _dismissViewControllerWithAnimationController:interactionController:completion:]_block_invoke_2
59 UIKitCore          +[UIView(Animation) performWithoutAnimation:]
60 UIKitCore          -[UIViewController _dismissViewControllerWithAnimationController:interactionController:completion:]
61 UIKitCore          +[UIView(Animation) performWithoutAnimation:]
62 UIKitCore          -[UIViewController _dismissViewControllerWithTransition:from:completion:]
63 UIKitCore          -[UIViewController dismissViewControllerWithTransition:completion:]
64 UIKitCore          -[UIViewController _performCoordinatedPresentOrDismiss:animated:]
65 UIKitCore          -[UIViewController dismissViewControllerAnimated:completion:]
66 UIKitCore          ___68-[UIWindow _removeAllViewControllersFromWindowHierarchyFromDealloc:]_block_invoke
67 UIKitCore          +[UIViewController _performWithoutDeferringTransitionsAllowingAnimation:actions:]
68 UIKitCore          -[UIWindow _removeAllViewControllersFromWindowHierarchyFromDealloc:]
69 UIKitCore          -[UIWindow setRootViewController:]
70 AliceLegends       UnityCleanupTrampoline (UnityAppController.mm:178:34)
71 AliceLegends       -[UnityAppController applicationWillTerminate:] (UnityAppController.mm:518:9)
72 UIKitCore          -[UIApplication _terminateWithStatus:]
73 UIKitCore          -[_UISceneLifecycleMultiplexer _evalTransitionToSettings:fromSettings:forceExit:withTransitionStore:]
74 UIKitCore          -[_UISceneLifecycleMultiplexer forceExitWithTransitionContext:scene:]
75 UIKitCore          -[UIApplication workspaceShouldExit:withTransitionContext:]
76 FrontBoardServices ___63-[FBSWorkspaceScenesClient willTerminateWithTransitionContext:]_block_invoke_2
77 FrontBoardServices -[FBSWorkspace _calloutQueue_executeCalloutFromSource:withBlock:]
78 FrontBoardServices ___63-[FBSWorkspaceScenesClient willTerminateWithTransitionContext:]_block_invoke
79 libdispatch.dylib  __dispatch_client_callout
80 libdispatch.dylib  __dispatch_block_invoke_direct$VARIANT$mp
81 FrontBoardServices __FBSSERIALQUEUE_IS_CALLING_OUT_TO_A_BLOCK__
82 FrontBoardServices -[FBSSerialQueue _targetQueue_performNextIfPossible]
83 FrontBoardServices -[FBSSerialQueue _performNextFromRunLoopSource]
84 CoreFoundation     ___CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__
85 CoreFoundation     ___CFRunLoopDoSource0
86 CoreFoundation     ___CFRunLoopDoSources0
87 CoreFoundation     ___CFRunLoopRun
88 CoreFoundation     _CFRunLoopRunSpecific
89 GraphicsServices   _GSEventRunModal
90 UIKitCore          -[UIApplication _run]
91 UIKitCore          _UIApplicationMain
92 AliceLegends       -[UnityFramework runUIApplicationMainWithArgc:argv:] (main.mm:96:5)
93 AliceLegends       main (main.mm:26:9)
2

Hey @bearhugmo ,

Thanks for sharing this. One question, do you have an OnClosed event subscribed to your RewardedAd instance? Would you mind sharing the contents of that if it exists?

Are there any other steps you’re doing to trigger this behaviour? Is it 100% reproducible for you? So far I haven’t been able to reproduce this.

Thanks!

3

I’ve only observed this on one occurrence so far and it occurred after the app was suspended.
8121806--1052726--upload_2022-5-12_10-3-35.png

Here are the contents of our callback and the delayed method which handles the behaviour.

private void OnAdClosed(object sender, EventArgs e)
        {
            Logger.Debug(nameof(OnAdClosed));
          
            // Delay by a frame because it is possible for OnAdClosed to be called before OnUserEarnedReward
            void OnAction()
            {
                _scheduler.ScheduleFrames(1, OnDelayAdClosed);
            }
          
            OnAction();
        }

        private void OnDelayAdClosed()
        {
            if (!_watched)
            {
                Assert.IsNotNull(LoadedAd);
                Skipped?.Invoke(LoadedAd);
            }
            else
            {
                Watched?.Invoke(LoadedAd);
            }
       
            IsWatching.Value = false; 
            ReloadInternal(LoadedAd);
        }
4

Hi @bearhugmo ,

Thank you for sharing this insight. So OnAdClosed is called after the app goes into the background. That is strange. Generally, this event is triggered by a user invoked event, where the close button is clicked. I’ve tested to see if Admob’s rewarded ad triggers this event in the background, but so far I haven’t been able to reproduce. I’ll let you know if I am able to reproduce.

Thanks

1 Like
5

Could it be impacted by runInBackground flag being set on the device?

8122661--1052897--upload_2022-5-12_15-43-10.png

6

Also we had rolled back to
when we saw this.

7

Hey @bearhugmo , I’ll see if I can reproduce that and if I can, I’ll let you know.

As for the UnityAds rollback, if you remove that XML file, do you still see this issue? You should see UnityAds 4.2.1 installed at that point.

Thank you for sharing this issue!

Best regards,