iOS:com.apple.root.default-overcommit-priority

我收到Crashlytics的崩溃:

Crashed: com.apple.root.default-overcommit-priority
EXC_BAD_ACCESS KERN_INVALID_ADDRESS at 0x8b2b0353

Thread : Crashed: com.apple.root.default-overcommit-priority
0  myApplication                  0x0028f0c4 Parse
1  ???                            0xffffffc9 
2  myApplic                       0x00291073 ukeylist_get_scan
3  libsystem_pthread.dylib        0x3aac9c5d _pthread_body + 140
4  libsystem_pthread.dylib        0x3aac9bcf _pthread_start + 102

我的问题:

com.apple.root.default-overcommit-priority手段？(也许记忆？)

为什么第二行是???

如何解决这个问题？

感谢您抽出宝贵时间来帮我解决这个问题.