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