[iOS] Rarely crashes at the timing of objc_msgSend()

[REQUIRED] Step 1: Describe your environment

• Unity version: 2021.3.6f1
• Google Mobile Ads Unity plugin version: GoogleMobileAds-v7.1.0
• Platform: iOS
• Platform OS version: iOS 15.5
• Mediation ad networks used, and their versions: com.google.ads.mediation:ironsource:7.2.2.1.0 GoogleMobileAdsMediationIronSource:7.2.2.1.0 com.google.ads.mediation:facebook:6.11.0.1 GoogleMobileAdsMediationFacebook:6.11.1.0 com.unity3d.ads:unity-ads:4.2.1 GoogleMobileAdsMediationUnity:4.2.1.0

[REQUIRED] Step 2: Describe the problem

Steps to reproduce:

What happened? How can we make the problem occur? Rarely crashes at the timing of objc_msgSend(). The cause is unknown, but I believe the crash occurs when it is called repeatedly. In my game, if an ad cannot be retrieved, it tries to retrieve it once every 5 seconds.

An excerpt of my code

void OnAdFailedToLoad(object sender, AdFailedToLoadEventArgs e)
{
    waitingTimeIfAdDoesNotLoad = 5;
    Debug.LogWarning("Reward ad failed to show with error: "+ e.LoadAdError.GetMessage());
}

void Update()
{
    if (waitingTimeIfAdDoesNotLoad <= 0)
    {
        return;
    }

    waitingTimeIfAdDoesNotLoad -= Time.deltaTime;
    if (waitingTimeIfAdDoesNotLoad <= 0)
    {
        if (!IsLoaded())
        {
            StartLoadAd();
        }
    }
}

iOS Clash Report

Exception Type:  EXC_BAD_ACCESS (SIGSEGV)
Exception Subtype: KERN_INVALID_ADDRESS at 0x0000e8d6d499c370 -> 0x00000056d499c370 (possible pointer authentication failure)
Exception Codes: 0x0000000000000001, 0x0000e8d6d499c370
VM Region Info: 0x56d499c370 is in 0x1000000000-0x7000000000;  bytes after start: 304214557552  bytes before end: 108102302863
      REGION TYPE                 START - END      [ VSIZE] PRT/MAX SHRMOD  REGION DETAIL
      commpage (reserved)      fc0000000-1000000000 [  1.0G] ---/--- SM=NUL  ...(unallocated)
--->  GPU Carveout (reserved) 1000000000-7000000000 [384.0G] ---/--- SM=NUL  ...(unallocated)
      UNUSED SPACE AT END
Exception Note:  EXC_CORPSE_NOTIFY
Triggered by Thread:  0

Kernel Triage:
VM - Compressor failed a blocking pager_get
VM - pmap_enter failed with resource shortage
VM - pmap_enter failed with resource shortage
VM - pmap_enter failed with resource shortage
VM - Compressor failed a blocking pager_get

Thread 0 name:
Thread 0 Crashed:
0   libobjc.A.dylib               	0x00000001a2c12f40 objc_msgSend + 32 (:-1)
1   UnityFramework                	0x000000010c3ee644 GADUGetAdErrorMessage + 24
2   UnityFramework                	0x000000010d4f4844 0x10afec000 + 38832196
3   UnityFramework                	0x000000010c4c0c54 0x10afec000 + 21843028 (Assembly-CSharp.cpp:15723)
4   UnityFramework                	0x000000010c54b1a4 0x10afec000 + 22409636
5   UnityFramework                	0x000000010c3a42ac il2cpp::vm::Runtime::InvokeWithThrow(MethodInfo const*, void*, void**) + 100 (Runtime.cpp:576)
6   UnityFramework                	0x000000010c3a40fc 0x10afec000 + 20676860 (Runtime.cpp:562)
7   UnityFramework                	0x000000010b7bf700 scripting_method_invoke(ScriptingMethodPtr, ScriptingObjectPtr, ScriptingArguments&, ScriptingExceptionPtr*, bool) + 112 (ScriptingApi_Il2Cpp.cpp:292)
8   UnityFramework                	0x000000010b7ce364 0x10afec000 + 8266596 (ScriptingInvocation.cpp:298)
9   UnityFramework                	0x000000010b7dea94 0x10afec000 + 8333972
10  UnityFramework                	0x000000010b587b98 0x10afec000 + 5880728
11  UnityFramework                	0x000000010b587a64 BehaviourManager::Update() + 36 (Behaviour.cpp:173)
12  UnityFramework                	0x000000010b659f68 0x10afec000 + 6741864 (Player.cpp:1605)
13  UnityFramework                	0x000000010b65ab6c ExecutePlayerLoop(NativePlayerLoopSystem*) + 100 (PlayerLoop.cpp:383)
14  UnityFramework                	0x000000010b65abac 0x10afec000 + 6745004 (PlayerLoop.cpp:404)
15  UnityFramework                	0x000000010b65ae94 0x10afec000 + 6745748 (PlayerLoop.cpp:508)
16  UnityFramework                	0x000000010be1aaf4 UnityPlayerLoopImpl(bool) + 116 (LibEntryPoint.mm:327)
17  UnityFramework                	0x000000010b0069f8 0x10afec000 + 109048
18  UnityFramework                	0x000000010b006960 -[UnityAppController(Rendering) repaintDisplayLink] + 108 (UnityAppController+Rendering.mm:71)
19  QuartzCore                    	0x000000018dbe0d40 CA::Display::DisplayLink::dispatch_items(unsigned long long, unsigned long long, unsigned long long) + 748 (CADisplay.mm:4175)
20  QuartzCore                    	0x000000018dbe7d70 display_timer_callback(__CFMachPort*, void*, long, void*) + 372 (CADisplayTimer.cpp:219)
21  CoreFoundation                	0x0000000189e9ebf0 __CFMachPortPerform + 176 (CFMachPort.c:549)
22  CoreFoundation                	0x0000000189ee2258 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE1_PERFORM_FUNCTION__ + 60 (CFRunLoop.c:1996)
23  CoreFoundation                	0x0000000189ee5a64 __CFRunLoopDoSource1 + 604 (CFRunLoop.c:2136)
24  CoreFoundation                	0x0000000189e9f664 __CFRunLoopRun + 2372 (CFRunLoop.c:3172)
25  CoreFoundation                	0x0000000189eb2bc8 CFRunLoopRunSpecific + 600 (CFRunLoop.c:3268)
26  GraphicsServices              	0x00000001a5fe6374 GSEventRunModal + 164 (GSEvent.c:2200)
27  UIKitCore                     	0x000000018c822648 -[UIApplication _run] + 1100 (UIApplication.m:3511)
28  UIKitCore                     	0x000000018c5a3d90 UIApplicationMain + 364 (UIApplication.m:5064)
29  UnityFramework                	0x000000010b006434 -[UnityFramework runUIApplicationMainWithArgc:argv:] + 108 (main.mm:96)
30  ProductName                   	0x00000001047bbe00 main + 68 (main.mm:26)
31  dyld                          	0x0000000104b4dce4 start + 520 (dyldMain.cpp:879)

[NVentimiglia]

Hi @IShix-g,

Thanks for the report. We have verified to the issue and will patch it shortly.

[NVentimiglia]

Closing, this will be fixed next release.