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#0  0x00000000004704ae in circuit_expire_building () at circuituse.c:559
559           log_info(LD_CIRC,"Marking circ %s:%d:%d (state %d:%s, purpose %d) "
(gdb) where
#0  0x00000000004704ae in circuit_expire_building () at circuituse.c:559
#1  0x000000000040c8cc in run_scheduled_events (timer=<value optimized out>,
    arg=<value optimized out>) at main.c:1416
#2  second_elapsed_callback (timer=<value optimized out>,
    arg=<value optimized out>) at main.c:1636
#3  0x00007f97ea023344 in event_base_loop () from /usr/lib/libevent-1.4.so.2
#4  0x0000000000409fa1 in do_main_loop () at main.c:1924
#5  0x000000000040a2dd in tor_main (argc=<value optimized out>,
    argv=0x7fff65475318) at main.c:2619
#6  0x00007f97e92d7c4d 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=0x7fff65475308)
    at libc-start.c:228                                   
#7  0x00000000004087c9 in _start ()                       

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This was Tor 0.2.3.10-alpha-dev (git-53d88eb1ecf77147)