After updating my 1.5_ALPHA2 and rebuilding everything on the 18th,
dhcpd has started to dump core at some random time after it starts
up. It didn't do this previously with binaries built (I think) around
Oct. 3. Here's the stack trace from a gdb of the corefile says (it's
the same for two different cores):

    #0  0x807fd16 in dns_zone_lookup ()
    #1  0x80800e2 in cache_found_zone ()
    #2  0x80861eb in MRres_findzonecut ()
    #3  0x8083dcf in minires_nupdate ()
    #4  0x80722be in evaluate_numeric_expression ()
    #5  0x806f05e in find_matching_case ()
    #6  0x806dfd2 in execute_statements ()
    #7  0x806e088 in execute_statements ()
    #8  0x806e088 in execute_statements ()
    #9  0x804e198 in ack_lease ()
    #10 0x804b7de in dhcprequest ()
    #11 0x804b0e3 in dhcp ()
    #12 0x8082e60 in do_packet ()
    #13 0x806cd95 in got_one ()
    #14 0x8067c43 in omapi_one_dispatch ()
    #15 0x806bc32 in dispatch ()
    #16 0x804aceb in main ()
    #17 0x8049ca9 in ___start ()

What now?