=17847==ERROR: AddressSanitizer: stack-buffer-overflow on address ... at pc ...
#0 0x10f7f5d44 in fill(int*) (a.out:x86_64+0x100000d44)
#1 0x10f7f5b81 in main (a.out:x86_64+0x100000b81)
#2 0x7fff5f490014 in start (libdyld.dylib:x86_64+0x1014)
...
AddressSanitizer is a fast memory error detector. It consists of a compiler instrumentation module and a run-time library. The tool can detect the following types of bugs: