(gdb) thread apply all bt

Thread 2 (Thread 0x7f25fb187700 (LWP 869)):
#0  0x00000039e08e85c3 in __GI___poll (fds=<optimized out>, 
    nfds=<optimized out>, timeout=<optimized out>)
    at ../sysdeps/unix/sysv/linux/poll.c:87
#1  0x00000039e340c287 in avc_netlink_receive (buf=0x7f25fb1869d0 "", 
    blocking=1, buflen=1024) at avc_internal.c:105
#2  0x00000039e340c696 in avc_netlink_loop () at avc_internal.c:254
#3  0x00000039e1407d90 in start_thread (arg=0x7f25fb187700)
    at pthread_create.c:309
#4  0x00000039e08f0f5d in clone ()
    at ../sysdeps/unix/sysv/linux/x86_64/clone.S:115

Thread 1 (Thread 0x7f25fb395800 (LWP 865)):
#0  0x00000039e0836285 in __GI_raise (sig=6)
    at ../nptl/sysdeps/unix/sysv/linux/raise.c:64
#1  0x00000039e0837b9b in __GI_abort () at abort.c:91
#2  0x000000000042ff25 in _dbus_abort () at dbus-sysdeps.c:94
#3  0x0000000000428ae1 in _dbus_warn_check_failed (
    format=0x442400 "arguments to %s() were incorrect, assertion \"%s\" failed in file %s line %d.\nThis is normally a bug in some application using the D-Bus library.\n") at dbus-internals.c:289
#4  0x000000000041f2dc in dbus_message_set_reply_serial (
---Type <return> to continue, or q <return> to quit---
    message=<optimized out>, reply_serial=0) at dbus-message.c:1008
#5  0x0000000000421714 in dbus_message_new_error (reply_to=0x1ae30d0, 
    error_name=0x1b41930 "org.freedesktop.DBus.Error.TimedOut", 
    error_message=0x1b41810 "Activation of org.freedesktop.systemd1 timed out")
    at dbus-message.c:1357
#6  0x000000000040dc63 in bus_transaction_send_error_reply (
    transaction=0x1af88e0, connection=0x1ab80f0, error=<optimized out>, 
    in_reply_to=<optimized out>) at connection.c:2262
#7  0x000000000040471e in try_send_activation_failure (how=0x7fff56a1e760, 
    pending_activation=0x1ae1500) at activation.c:1248
#8  pending_activation_failed (pending_activation=0x1ae1500, 
    how=0x7fff56a1e760) at activation.c:1277
#9  0x000000000040481b in pending_activation_timed_out (data=0x1ae1500)
    at activation.c:1479
#10 0x0000000000404bbe in handle_timeout_callback (timeout=<optimized out>, 
    data=0x1ae1500) at activation.c:152
#11 0x00000000004310c0 in _dbus_loop_iterate (loop=0x1aac1f0, block=1)
    at dbus-mainloop.c:758
#12 0x000000000043148d in _dbus_loop_run (loop=0x1aac1f0)
    at dbus-mainloop.c:893
#13 0x00000000004041cc in main (argc=<optimized out>, argv=0x7fff56a1eea8)
    at main.c:520
(gdb)