dir auth segfault on master
``` (gdb) bt #0 0x00007ffff77327db in event_del () from /usr/lib/libevent-1.4.so.2 #1 0x000000000040a347 in connection_stop_reading (conn=0x24d7c80) at main.c:510 #2 0x00000000004907b9 in connection_or_close_connection_cb ( _conn=0xcccccccccccccccc) at connection_or.c:1165 #3 0x00007ffff7733344 in event_base_loop () from /usr/lib/libevent-1.4.so.2 #4 0x0000000000409cf1 in do_main_loop () at main.c:1923 #5 0x000000000040a02d in tor_main (argc=<value optimized out>, argv=0x7fffffffe1d8) at main.c:2614 #6 0x00007ffff69e7c4d in __libc_start_main (main=<value optimized out>, argc=<value optimized out>, ubp_av=<value optimized out>, init=<value optimized out>, fini=<value optimized out>, rtld_fini=<value optimized out>, stack_end=0x7fffffffe1c8) at libc-start.c:228 #7 0x0000000000408519 in _start () ``` Not quite sure if only dirauths are affected
issue