* James Yonan: >> >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> >> Program terminated with signal 10, Bus error. >> #0 0x120023904 in mroute_extract_addr_from_packet >> (src=0x1ffffb220, dest=0x1ffffb208, buf=0x1, tunnel_type=-20292) at >> mroute.c:113 >> 113 memcpy (src->addr, &ip->saddr, 4); >> >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> >> >> I think my system choke on the 'ip->saddr' address in the memcpy statement. > > That's strange that it would hit an alignment fault on a memcpy. memcpy > is supposed to operate at byte granularity.
I suspect this statement is the problem: const struct openvpn_iphdr *ip = (const struct openvpn_iphdr *) BPTR (buf); The cast results in undefined behavior if BPTR (buf) has the wrong alignment. Recent versions of GCC know this and therefore conclude that BPTR must be properly aligned. As a result, it is possible to replace memcpy() with something that copies word-wise. The char * casts in your other message won't fix this, they come too late. It's a common misconception that char pointers behave like machine addresses. They don't. Just to be clear, this is not a bug in GCC. Your code is not valid C.
