最近从 crashlytics 中，我们的应用程序出现了一些崩溃，日志如下。还有其他人面临同样的问题吗？任何帮助，将不胜感激。
Exception Type: EXC_BAD_ACCESS (SIGBUS)
Exception Subtype: KERN_PROTECTION_FAILURE at 0x000000010000000c
Triggered by Thread: 0
Thread 0 name:
Thread 0 Crashed:
0 libdispatch.dylib 0x0000000197ed257c _dispatch_barrier_async_f_slow + 116 (atomic_llsc.h:3811)
1 libdispatch.dylib 0x0000000197ed2530 _dispatch_barrier_async_f_slow + 40 (queue.c:2251)
2 CoreText 0x0000000187c7cfd8 CTFontTransformGlyphs + 400 (CTFont.cpp:2189)
3 UIFoundation 0x000000019415aba8 __NSStringDrawingEngine + 13312 (NSStringDrawing.m:866)
4 UIFoundation 0x0000000194157690 -[NSString(NSExtendedStringDrawing) drawWithRect:options:attributes:context:] + 180 (NSStringDrawing.m:2046)
5 UIKit 0x000000018ba31bd4 -[UILabel _drawTextInRect:baselineCalculationOnly:] + 3516 (UILabel.m:2100)
6 UIKit 0x000000018ba9e8e8 -[UILabel drawTextInRect:] + 512 (UILabel.m:1734)
7 UIKit 0x000000018ba9e684 -[UIView(CALayerDelegate) drawLayer:inContext:] + 388 (UIView.m:9551)
8 QuartzCore 0x000000018b3a1fdc -[CALayer drawInContext:] + 280 (CALayer.mm:8214)
9 QuartzCore 0x000000018b38b584 CA::Layer::display_() + 528 (CALayer.mm:7994)
10 QuartzCore 0x000000018b36cb38 CA::Layer::display_if_needed(CA::Transaction*) + 240 (CALayer.mm:2335)
11 QuartzCore 0x000000018b36c7f0 CA::Layer::layout_and_display_if_needed(CA::Transaction*) + 40 (CALayer.mm:2358)
12 QuartzCore 0x000000018b36bfe4 CA::Context::commit_transaction(CA::Transaction*) + 272 (CAContextInternal.cpp:1535)
13 QuartzCore 0x000000018b36bd68 CA::Transaction::commit() + 432 (CATransactionInternal.cpp:393)
14 QuartzCore 0x000000018b365798 CA::Transaction::observer_callback(__CFRunLoopObserver*, unsigned long, void*) + 76 (CATransactionInternal.cpp:735)
15 CoreFoundation 0x0000000187252384 __CFRUNLOOP_IS_CALLING_OUT_TO_AN_OBSERVER_CALLBACK_FUNCTION__ + 28 (CFRunLoop.c:1622)
16 CoreFoundation 0x000000018724f310 __CFRunLoopDoObservers + 356 (CFRunLoop.c:1718)
17 CoreFoundation 0x000000018724f6f0 __CFRunLoopRun + 832 (CFRunLoop.c:2548)
18 CoreFoundation 0x000000018717d660 CFRunLoopRunSpecific + 392 (CFRunLoop.c:2795)
19 GraphicsServices 0x00000001902bf5a0 GSEventRunModal + 164 (GSEvent.c:2245)
20 UIKit 0x000000018ba824f4 UIApplicationMain + 1484 (UIApplication.m:2926)
21 TestApp 0x000000010004ffa0 main + 88 (main.m:16)
22 libdyld.dylib 0x0000000197eeea04 start + 0 (start_glue.s:78)
谢谢 ！
