Found this one this afternoon:
#0 0x3ff800d7154 in strcmp () from /usr/shlib/libc.so
#1 0x1200ba918 in smtp_transport_entry (tblock=0x140052eb8,
addrlist=0x140053948) at smtp.c:2080
#2 0x1200587fc in do_remote_deliveries (fallback=0) at deliver.c:3001
#3 0x12005c8a0 in deliver_message (id=0x11fffff78 "169E0U-0004OG-00",
forced=1, give_up=1073753024) at deliver.c:5116
#4 0x120066ae4 in main (argc=6, argv=0x11ffffea8) at exim.c:2642
smtp.c:
2080 if (continuing && (strcmp(continue_hostname, host->name) != 0 ||
2081 strcmp(continue_host_address, host->address) != 0))
2082 {
(gdb) p continue_hostname
$10 = 0x11fffff66 "smtp.taiwan.com"
(gdb) p host->name
$11 = 0x140053b18 "smtp.taiwan.com"
(gdb) p continue_host_address
$12 = 0x0
(gdb) p host->address
$13 = 0x140053b30 "210.59.146.177"
I've saved the core if there's any more I can provide. Thanks!