Iphone Restarts after relaunching the app from background - ios

Question

I relaunches the ios app from bacground to foreground - iphone restarts and says backbaordd crash
Please find the below crash logs for your reference
Exception Type: EXC_BAD_ACCESS (SIGSEGV)
Exception Subtype: KERN_INVALID_ADDRESS at 0x0000000000000001
Triggered by Thread: 5
Thread 0:
0 libsystem_kernel.dylib 0x0000000192a7dca0 mach_msg_trap + 8
1 CoreFoundation 0x0000000185e5ed20 __CFRunLoopServiceMachPort + 180
2 CoreFoundation 0x0000000185e5cf14 __CFRunLoopRun + 932
3 CoreFoundation 0x0000000185d9ddcc CFRunLoopRunSpecific + 448
4 backboardd 0x00000001000e7a60 0x1000e0000 + 31328
5 libdyld.dylib 0x000000019299ba9c start + 0
Thread 1:
0 libsystem_kernel.dylib 0x0000000192a7daa8 kevent64 + 8
1 libdispatch.dylib 0x0000000192981998 _dispatch_mgr_thread + 48
Thread 2 name: com.apple.CoreAnimation.render-server
Thread 2:
0 libsystem_kernel.dylib 0x0000000192a7dca0 mach_msg_trap + 8
1 QuartzCore 0x0000000188b02a18 CA::Render::Server::server_thread(void*) + 236
2 QuartzCore 0x0000000188b9422c thread_fun + 24
3 libsystem_pthread.dylib 0x0000000192b17e18 _pthread_body + 164
4 libsystem_pthread.dylib 0x0000000192b17d70 _pthread_start + 136
5 libsystem_pthread.dylib 0x0000000192b15550 thread_start + 0
Thread 3:
0 libsystem_kernel.dylib 0x0000000192a7dca0 mach_msg_trap + 8
1 CoreFoundation 0x0000000185e5ed20 __CFRunLoopServiceMachPort + 180
2 CoreFoundation 0x0000000185e5ceb0 __CFRunLoopRun + 832
3 CoreFoundation 0x0000000185d9ddcc CFRunLoopRunSpecific + 448
4 CoreFoundation 0x0000000185df3454 CFRunLoopRun + 108
5 IOMobileFramebuffer 0x000000018bf3e484 iomfb_runloop_thread + 312
6 libsystem_pthread.dylib 0x0000000192b17e18 _pthread_body + 164
7 libsystem_pthread.dylib 0x0000000192b17d70 _pthread_start + 136
8 libsystem_pthread.dylib 0x0000000192b15550 thread_start + 0
Thread 4 name: com.apple.CoreAnimation.IOMFB.wireless
Thread 4:
0 libsystem_kernel.dylib 0x0000000192a7dca0 mach_msg_trap + 8
1 CoreFoundation 0x0000000185e5ed20 __CFRunLoopServiceMachPort + 180
2 CoreFoundation 0x0000000185e5ceb0 __CFRunLoopRun + 832
3 CoreFoundation 0x0000000185d9ddcc CFRunLoopRunSpecific + 448
4 CoreFoundation 0x0000000185df3454 CFRunLoopRun + 108
5 QuartzCore 0x0000000188b58a20 CA::WindowServer::IOMFBServer::thread_body(void*) + 344
6 QuartzCore 0x0000000188b9422c thread_fun + 24
7 libsystem_pthread.dylib 0x0000000192b17e18 _pthread_body + 164
8 libsystem_pthread.dylib 0x0000000192b17d70 _pthread_start + 136
9 libsystem_pthread.dylib 0x0000000192b15550 thread_start + 0
Thread 5 name: com.apple.CoreAnimation.IOMFB.primary
Thread 5 Crashed:
0 libGPUSupportMercury.dylib 0x000000018b658694 gpus_ReturnContextErrorKillClient + 12
1 AGXGLDriver 0x0000000184a77248 SubmitPackets + 196
2 AGXGLDriver 0x0000000184a6c3a0 glrSetPrivateInteger + 284
3 GLEngine 0x000000018870427c gliSetInteger + 4592
4 OpenGLES 0x00000001887f11e8 -[EAGLContext swapNotification:forTransaction:onLayer:] + 152
5 QuartzCore 0x0000000188b562c0 CA::WindowServer::IOMFBDisplay::finish_update(CA::Render::Update*, unsigned int) + 1348
6 QuartzCore 0x0000000188b5c0a8 CA::WindowServer::Server::render_for_time(double, CVTimeStamp const*) + 1536
7 QuartzCore 0x0000000188b58bf4 CA::WindowServer::IOMFBServer::vsync_callback(__IOMobileFramebuffer*, unsigned long long, unsigned long long, unsigned long long, void*) + 220
8 IOKit 0x0000000186d9fe70 IODispatchCalloutFromCFMessage + 360
9 CoreFoundation 0x0000000185e50a8c __CFMachPortPerform + 188
10 CoreFoundation 0x0000000185e5f03c __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE1_PERFORM_FUNCTION__ + 52
11 CoreFoundation 0x0000000185e5ef9c __CFRunLoopDoSource1 + 440
12 CoreFoundation 0x0000000185e5d1c0 __CFRunLoopRun + 1616
13 CoreFoundation 0x0000000185d9ddcc CFRunLoopRunSpecific + 448
14 CoreFoundation 0x0000000185df3454 CFRunLoopRun + 108
15 QuartzCore 0x0000000188b58a20 CA::WindowServer::IOMFBServer::thread_body(void*) + 344
16 QuartzCore 0x0000000188b9422c thread_fun + 24
17 libsystem_pthread.dylib 0x0000000192b17e18 _pthread_body + 164
18 libsystem_pthread.dylib 0x0000000192b17d70 _pthread_start + 136
19 libsystem_pthread.dylib 0x0000000192b15550 thread_start + 0
Thread 6 name: IOHIDService - RunLoopCompatibilityThread
Thread 6:
0 libsystem_kernel.dylib 0x0000000192a7dca0 mach_msg_trap + 8
1 CoreFoundation 0x0000000185e5ed20 __CFRunLoopServiceMachPort + 180
2 CoreFoundation 0x0000000185e5ceb0 __CFRunLoopRun + 832
3 CoreFoundation 0x0000000185d9ddcc CFRunLoopRunSpecific + 448
4 CoreFoundation 0x0000000185df3454 CFRunLoopRun + 108
5 IOKit 0x0000000186dc23bc __IOHIDServiceRunLoopCompatibilityThread + 184
6 libsystem_pthread.dylib 0x0000000192b17e18 _pthread_body + 164
7 libsystem_pthread.dylib 0x0000000192b17d70 _pthread_start + 136
8 libsystem_pthread.dylib 0x0000000192b15550 thread_start + 0
Totally what causes this issue and also kindly suggest me how to debug this issue..

Answer 1

Your app gets terminated by the ios for any one of the reason below,
High memory usage or the springboard crashes( springboard is application that manages the other applications like home screen, app icon etc).
Testing your application in jail broken devices.
Try to pause your animation stuff while resigning the application and resume them while user entering back to the application. Something like this,
- (void)applicationWillResignActive:(UIApplication *)application
{
// pause sprite kit
SKView *view = (SKView *)self.window.rootViewController.view;
view.paused = YES;
}
- (void)applicationDidBecomeActive:(UIApplication *)application
{
// resume sprite kit
SKView *view = (SKView *)self.window.rootViewController.view;
view.paused = NO;
}

Answer 2

Do you use OpenGL? Or some kind of framework, that works with camera.
Rendering surfaces is forbidden in background.
Try to handle background/foreground state changes to pause/resume rendering.
You can user UIApplicationDidEnterBackgroundNotification and UIApplicationWillEnterForegroundNotification for this.