SEGV_MAPERR

SEGV_MAPERR or SIGSEGV

segmentation fault， 一般由a dangling pointer issue, or some sort of buffer overflow

有两种SEGV，由一次无效内存访问错误引起。

1，A page was accessed which had the wrong permissions. 如某块内存区域是只读的，而程序尝试去写该块内存。SEGV_ACCERR

2，A page was accessed that is not even mapped into the address space of the application at all.

一般会dereferencing a null pointer or a pointer that was corrupted with a small integer value

SEGV_MAPERR