(gdb) bt
#0  0xd28f92f0 in countbytes () from /lib/libc.so.1
#1  0xd2939805 in _ndoprnt () from /lib/libc.so.1
#2  0xd293bc30 in vsnprintf () from /lib/libc.so.1
#3  0x080aa2b4 in tor_vsnprintf (str=0x0, size=3533398016,
    format=0x80c9d68 "Unable to parse '%s', or no nameservers in '%s'",
    args=0x8047c44 "") at compat.c:320
#4  0x080a68da in logv (severity=4, domain=65536,
    funcname=0x80c9839 "configure_nameservers",
    format=0x80c9d68 "Unable to parse '%s', or no nameservers in '%s'",
    ap=0x8047c44 "") at log.c:184
#5  0x080a6a53 in _log_fn (severity=0, domain=0,
    fn=0x80c9d7b "', or no nameservers in '%s'",
    format=0x80c9d68 "Unable to parse '%s', or no nameservers in '%s'")
    at log.c:277
#6  0x08080575 in configure_nameservers (force=0) at dns.c:1547
#7  0x08087ca3 in tor_main (argc=1, argv=0x8047e80) at main.c:1212
#8  0x0804c700 in _start ()