iOS 6 Maps occasional Crash - iphone

Question

I'm getting occasionally crash with iOS 6 MapKit. Can't really reproduce it. What can cause this?
Exception Type: EXC_BAD_ACCESS (SIGSEGV)
Exception Codes: KERN_INVALID_ADDRESS at 0x00000044
Crashed Thread: 0
Thread 0 name: Dispatch queue: com.apple.main-thread
Thread 0 Crashed:
0 IMGSGX543GLDriver 0x38f231b4 sgxTextureGetImageRowBytes(GLDTextureRec*, unsigned int, unsigned int) + 8
1 IMGSGX543GLDriver 0x38f23160 CalculateChunkPlaneSizes(GLDTextureRec*, int, unsigned int*, unsigned int*, unsigned int*, unsigned int*) + 104
2 IMGSGX543GLDriver 0x38f25906 sgxConfigureTexturePrivate(GLDTextureRec*) + 82
3 IMGSGX543GLDriver 0x38f24584 glrUpdateTexture + 616
4 libGPUSupportMercury.dylib 0x342c76b6 gldLoadFramebuffer + 102
5 GLEngine 0x31b50e52 gleUpdateDrawFramebufferState + 178
6 GLEngine 0x31b52556 gleDoDrawDispatchCoreES2 + 126
7 GLEngine 0x31aedbc0 gleDrawArraysOrElements_Entries_Body + 140
8 GLEngine 0x31aea5ec glDrawArrays_ES2Exec + 160
9 VectorKit 0x3780dcd6 -[VKSkyModel drawScene:withContext:] + 326
10 VectorKit 0x377e76d6 -[VKModelObject recursiveDrawScene:whenReadyWithContext:] + 118
11 VectorKit 0x377621ea -[VKMapModel recursiveDrawScene:withContext:] + 278
12 VectorKit 0x37762096 -[VKModelObject recursiveDrawScene:withContext:] + 186
13 VectorKit 0x3775d4da -[VKScreenCanvas onTimerFired:] + 1014
14 VectorKit 0x3775b548 -[VKMapCanvas onTimerFired:] + 500
15 VectorKit 0x3775a3d2 -[VKMainLoop displayTimerFired:] + 610
16 QuartzCore 0x3095b06c CA::Display::DisplayLink::dispatch(unsigned long long, unsigned long long) + 156
17 QuartzCore 0x3095afc4 CA::Display::IOMFBDisplayLink::callback(__IOMobileFramebuffer*, unsigned long long, unsigned long long, unsigned long long, void*) + 60
18 IOMobileFramebuffer 0x331e4fd4 IOMobileFramebufferVsyncNotifyFunc + 152
19 IOKit 0x36fc4446 IODispatchCalloutFromCFMessage + 190
20 CoreFoundation 0x382a95d8 __CFMachPortPerform + 116
21 CoreFoundation 0x382b4170 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE1_PERFORM_FUNCTION__ + 32
22 CoreFoundation 0x382b4112 __CFRunLoopDoSource1 + 134
23 CoreFoundation 0x382b2f94 __CFRunLoopRun + 1380
24 CoreFoundation 0x38225eb8 CFRunLoopRunSpecific + 352
25 CoreFoundation 0x38225d44 CFRunLoopRunInMode + 100
26 GraphicsServices 0x3415f2e6 GSEventRunModal + 70
27 UIKit 0x351b72fc UIApplicationMain + 1116
28 MyApp 0x0005d78a main (main.m:14)
29 MyApp 0x0005d744 start + 36

Answer 1

I found this. It may help you fix your problem.
"Issue: An OpenGL ES-based application displays “flashing” or “stale” frames after a call to presentRenderBuffer.
This symptom can occur when an OpenGL ES application calls the EAGL presentRenderbuffer method without first drawing anything. What is seen on screen may contain uninitialized pixels or previously rendered frames. To correct this issue, you should always draw something to your framebuffer before calling presentRenderbuffer. Also note that unless you set the RetainedBackbuffer property on your CAEAGLLayer to enable retained backbuffer mode, the contents of your renderbuffer are not guaranteed to remain valid after a call to presentRenderbuffer".
-Lewis

Answer 2

I actually found the issue with the iOS version. The user was running on iPad 4, iOS 6.1.2, as soon as I upgraded to 6.1.3 the problem went away. Hope this helps someone.
Thanks, Tim

Answer 3

I had this exact issue and it turned out to be a memory pressure related crash. It was consistently crashing for me when the map appeared with a black background instead of any tiles or grid backgrounds like normal on the fourth or fifth time the map was shown. This occurred on iOS 6.0 and 6.1 and beta of 7.0.
My view controller with the map view wasn't being deallocated after it was removed from the Navigation stack and it had a strong reference to the map view which kept it in memory.
After fixing my leak, the problem disappeared.

Answer 4

I just experienced this testing an App on my iPad. It's always run with no problems in simulator and also on the device but just now it crashed at the same point with the same error.
Here's my method - very simple map showing user location and no annotations:
- (void)mapView:(MKMapView *)mapView regionDidChangeAnimated:(BOOL)animated {
MKCoordinateSpan span = self.mapView.region.span;
zoomLevel = span.latitudeDelta;
shouldAdjustZoom = NO;
}
Here's the crash log
Incident Identifier: 01AE9C88-1F56-44D4-92A1-C6B5938DEBD4
CrashReporter Key: f372f86613043286b74e70a8d1f9d7b1b5313cf5
Hardware Model: iPad3,4
Process: MyApp [1247]
Path: /var/mobile/Applications/C39AEC49-8DB1-45DE-B175-A6AEC19D533F/MyApp.app/MyApp
Identifier: MyApp
Version: ??? (???)
Code Type: ARM (Native)
Parent Process: launchd [1]
Date/Time: 2013-07-15 08:25:16.390 +0200
OS Version: iOS 6.1.3 (10B329)
Report Version: 104
Exception Type: EXC_BAD_ACCESS (SIGSEGV)
Exception Codes: KERN_INVALID_ADDRESS at 0x00000044
Crashed Thread: 0
Thread 0 name: Dispatch queue: com.apple.main-thread
Thread 0 Crashed:
0 IMGSGX554GLDriver 0x32ea6be0 0x32e99000 + 56288
1 IMGSGX554GLDriver 0x32ea6b8e 0x32e99000 + 56206
2 IMGSGX554GLDriver 0x32ea92f2 0x32e99000 + 66290
3 IMGSGX554GLDriver 0x32ea7f44 0x32e99000 + 61252
I ended a whole bunch of apps (mostly kids games) running in the background on the device and relaunched it and it then ran fine. Maybe helps someone pinpoint the exact problem and whether any changes in our Apps can prevent the crash.