iOS 6 Maps occasional Crash

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