error 14從未見過。誰能幫我解答什么情況才會出現這個，而且怎么定位崩潰函數地址？
備忘：
segfault at 引起故障的地址
ip 指令的內存地址
sp 堆棧指針地址, 及棧頂指針
err is not an errno nor a signal numbe, but page fault error code
[400000+13000] 對象崩潰時映射的虛擬內存起始地址和大小
error code是位運算，說明：
* bit 0 == 0: no page found1: protection fault
* bit 1 == 0: read access1: write access
* bit 2 == 0: kernel-mode access1: user-mode access
* bit 3 == 1: use of reserved bit detected
* bit 4 == 1: fault was an instruction fetch