Under some circumstances, loading history in libedit by history(H_LOAD)
causes abnormal program termination due to invalid memory access on line
693 of /usr/src/lib/libedit/history.c.

Fix: 

Compile the following program with ElectricFence
#include <histedit.h>
int main(int argc, char* argv[])
{
    History* h = history_init();
    HistEvent ev;
    history(h, &ev, H_LOAD, argv[1]);
    return 0;
}
and run it with a history file 4096 bytes long containing
_HiStOrY_V2_
def0123456789abcdef0123456789abcdef0123456789abcde
followed by 63 copies of line:
0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcde