I just had a #FFD700 moment.
A quick Google of memcpy SIGBUS lead me on a wild goose chase about alignment errors.
However, the problem for me was an extremely simple one - the kind that you might expect -Wall -Werror should catch.
int main(int argc, char* argv[])
{
char* str = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ"; // 36 + 1
memcpy(str, "abcdef", 3);
printf("%s\n", str);
// abcdef6789...
return 0;
}
What's the issue here? Well, str is actually a const char* because it's loaded into read-only memory!
int main(int argc, char* argv[])
{
const char* str_const = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ"; // 36 + 1
char* str = malloc(strlen(str_const) + 1);
memcpy(str, str_const, strlen(str_const) + 1);
memcpy(str, "abcdef", 3);
printf("%s\n", str);
// abcdef6789...
return 0;
}