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(gdb) up
#1  0xd2939805 in _ndoprnt () from /lib/libc.so.1
(gdb) up
#2  0xd293bc30 in vsnprintf () from /lib/libc.so.1
(gdb) up
#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
320       r = vsnprintf(str, size, format, args);
(gdb) up
#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
184       r = tor_vsnprintf(buf+n,buf_len-n,format,ap);