_decodeGhostPointEncoding中的EXC_BAD_ACCESS

Question

After updating to iOS 8.4 (2 days back) my app keeps crashing with the error below. All I am trying to do is zoom in/out a mapView. How do I debug this ? The crash doesn't seem to be coming from any part of my code. In addition to crash below in Xcode console I see

uncompress returned -3
uncompress returned -3
uncompress returned -3


Thread 7Queue : com.apple.root.default-qos (concurrent)
#0  0x000000018e70c0ec in _decodeGhostPointEncoding ()
#1  0x000000018e55bc08 in -[GEOVectorTile(VMP4) _readPolygons:ofType:] ()
#2  0x000000018e55ac48 in -[GEOVectorTile(VMP4) _readPolygons:] ()
#3  0x000000018e553564 in -[GEOVectorTile(VMP4) _initWithVMP4:localizationData:tileKey:] ()
#4  0x000000018e55220c in -[GEOVectorTile initWithTileData:localizationData:tileKey:] ()
#5  0x000000018e551ee8 in -[GEOVectorTileDecoder decodeTile:forKey:] ()
#6  0x000000018e586dc4 in __49-[GEOTileLoaderInternal _loadedTile:forKey:info:]_block_invoke419 ()
#7  0x0000000101580fd4 in _dispatch_call_block_and_release ()
#8  0x0000000101580f94 in _dispatch_client_callout ()
#9  0x000000010158eb54 in _dispatch_root_queue_drain ()
#10 0x0000000101590248 in _dispatch_worker_thread3 ()
#11 0x000000019745d22c in _pthread_wqthread ()
Enqueued from com.apple.geo.tile-loader.0x14754bd80 (Thread 8)Queue : com.apple.geo.tile-loader.0x14754bd80 (serial)
#0  0x0000000101582700 in dispatch_async ()
#1  0x000000018e550b7c in -[GEOTileLoaderInternal _loadedTile:forKey:info:] ()
#2  0x000000018e550608 in __40-[GEOTileServerRemoteProxy _handleTile:]_block_invoke ()
#3  0x0000000101580fd4 in _dispatch_call_block_and_release ()
#4  0x0000000101580f94 in _dispatch_client_callout ()
#5  0x000000010158bdb8 in _dispatch_queue_drain ()
#6  0x00000001015842c4 in _dispatch_queue_invoke ()
#7  0x000000010158e5d4 in _dispatch_root_queue_drain ()
#8  0x0000000101590248 in _dispatch_worker_thread3 ()
#9  0x000000019745d22c in _pthread_wqthread ()
#10 0x000000019745cef0 in start_wqthread ()
Enqueued from GEOTileServerRemoteProxy (Thread 8)Queue : GEOTileServerRemoteProxy (serial)
#0  0x000000010158a0bc in _dispatch_barrier_async_f ()
#1  0x000000018e54fd08 in -[GEOTileServerRemoteProxy _handleTile:] ()
#2  0x000000018e54f9d4 in -[GEOTileServerRemoteProxy _handleEvent:fromConnection:] ()
#3  0x0000000197484ccc in _xpc_connection_call_event_handler ()
#4  0x0000000197482bd0 in _xpc_connection_mach_event ()
#5  0x0000000101581068 in _dispatch_client_callout4 ()
#6  0x0000000101584a38 in _dispatch_mach_msg_invoke ()
#7  0x000000010158c384 in _dispatch_queue_drain ()
#8  0x0000000101583eac in _dispatch_mach_invoke ()
#9  0x000000010158c384 in _dispatch_queue_drain ()
#10 0x00000001015842c4 in _dispatch_queue_invoke ()
#11 0x000000010158e5d4 in _dispatch_root_queue_drain ()
#12 0x0000000101590248 in _dispatch_worker_thread3 ()
#13 0x000000019745d22c in _pthread_wqthread ()
#14 0x000000019745cef0 in start_wqthread ()

Answer 1

This seems like an exception coming from tile loader in iOS. I think this is a VectorKit framework issue. Don't think this is an app issue.

Answer 2

You are most probably trying to access an object which has been deallocated.

You could try to debug with the NSZombieEnabled

Edit your scheme and enable it.
Do not forget to disabled it, as it will not deallocate any objects while active.