Crash with in libGPUSupportMercury.dylib

[justinanderson]

One report from the App Store. Seems pretty rare. Happened on an iOS 8.1.2 device.

Exception Type:  EXC_BAD_ACCESS (SIGSEGV)
Exception Subtype: KERN_INVALID_ADDRESS at 0x00000001
Triggered by Thread:  26

Thread 26 name:  Dispatch queue: com.apple.mapdisplay.dispatch.tiledecodequeue
Thread 26 Crashed:
0   libGPUSupportMercury.dylib      0x31bf68fe gpus_ReturnNotPermittedKillClient + 10
1   libGPUSupportMercury.dylib      0x31bf73c8 gpusSubmitDataBuffers + 108
2   libGPUSupportMercury.dylib      0x31bf7244 gldCreateContext + 204
3   GLEngine                        0x2d7fa938 gliCreateContextWithShared + 600
4   OpenGLES                        0x2d8d6ab0 -[EAGLContext initWithAPI:properties:] + 404
5   OpenGLES                        0x2d8d68fa -[EAGLContext initWithAPI:sharegroup:] + 110
6   VectorKit                       0x35d2ce60 ggl::OESContext::OESContext(ggl::GLDevice*, std::__1::shared_ptr<ggl::OESSharegroup>) + 488
7   VectorKit                       0x35d26458 ggl::GLDevice::vendLoader() + 200
8   VectorKit                       0x35d015c2 -[VKRoadTile buildGglMeshesWithDevice:] + 2030
9   VectorKit                       0x35d000c4 -[VKRoadTile initWithKey:modelTile:styleManager:sharedResources:contentScale:device:] + 80
10  VectorKit                       0x359b388e -[VKRoadTileSource tileForData:downloadKey:sourceKey:] + 150
11  VectorKit                       0x359adbc0 __49-[VKTileSource decodeData:downloadKey:sourceKey:]_block_invoke + 80
12  libdispatch.dylib               0x38c0b7b8 _dispatch_call_block_and_release + 8
13  libdispatch.dylib               0x38c12572 _dispatch_async_redirect_invoke + 546
14  libdispatch.dylib               0x38c14da6 _dispatch_root_queue_drain + 862
15  libdispatch.dylib               0x38c149a4 _dispatch_worker_thread + 68
16  libsystem_pthread.dylib         0x38d6ee90 _pthread_body + 136
17  libsystem_pthread.dylib         0x38d6ee02 _pthread_start + 114
18  libsystem_pthread.dylib         0x38d6cb8c thread_start + 4

[loganwright]

Possibly related to this thread: http://stackoverflow.com/a/15814933/2611971

It suggests that this type of crash could be a result of drawing a map on a background thread.