#0  __opendirat (dfd=-100, name=0x0) at ../sysdeps/unix/opendir.c:87
        fd = 0
#1  0x00007f993e24a7de in usbfs_get_device_list (_discdevs=0x7fffe41573d8, ctx=0x733040) at ../../libusb/os/linux_usbfs.c:1088
        entry = <optimized out>
        buses = <optimized out>
        discdevs = <optimized out>
        r = <optimized out>
#2  op_get_device_list (ctx=0x733040, _discdevs=0x7fffe41573d8) at ../../libusb/os/linux_usbfs.c:1280
No locals.
#3  0x00007f993e2431dc in libusb_get_device_list (ctx=0x733040, list=0x7fffe41574a8) at ../../libusb/core.c:604
        discdevs = 0x728090
        ret = <optimized out>
        r = 0
        i = <optimized out>
        len = <optimized out>
        __FUNCTION__ = "libusb_get_device_list"
#4  0x00007f993e98a9f8 in ?? () from /tmp/tmpbinQiQ/usr/lib/libhpmud.so.0
No symbol table info available.
#5  0x00007f993e97f196 in hpmud_probe_devices () from /tmp/tmpbinQiQ/usr/lib/libhpmud.so.0
No symbol table info available.
#6  0x00007f993ef5f05d in ?? () from /tmp/tmpbinQiQ/usr/lib/sane/libsane-hpaio.so.1
No symbol table info available.
#7  0x00007f993ef5f610 in sane_hpaio_get_devices () from /tmp/tmpbinQiQ/usr/lib/sane/libsane-hpaio.so.1
No symbol table info available.
#8  0x00007f9955f843d6 in sane_dll_get_devices (device_list=device_list@entry=0x7fffe415bc88, local_only=local_only@entry=1) at dll.c:1056
        be_list = 0x7f9940206300
        be = 0x6e6e30
        status = <optimized out>
        full_name = <optimized out>
        i = <optimized out>
        num_devs = <optimized out>
        len = <optimized out>
#9  0x00007f9955f81d25 in sane_get_devices (dl=dl@entry=0x7fffe415bc88, local=local@entry=1) at dll-s.c:17
No locals.
#10 0x0000000000402474 in cd_sane_client_refresh (priv=priv@entry=0x6d01c0) at cd-main.c:303
        tmp = <optimized out>
        device_list = 0x0
        i = <optimized out>
        status = <optimized out>
#11 0x000000000040281a in cd_main_colord_connect_cb (source_object=<optimized out>, res=<optimized out>, user_data=user_data@entry=0x6d01c0) at cd-main.c:446
        priv = 0x6d01c0
        ret = <optimized out>
        error = 0x0
#12 0x00007f9955c9174e in g_simple_async_result_complete (simple=0x6d8d70) at /build/buildd/glib2.0-2.33.10/./gio/gsimpleasyncresult.c:775
        current_source = <optimized out>
        current_context = <optimized out>
        __PRETTY_FUNCTION__ = "g_simple_async_result_complete"
#13 0x00007f9955c9187c in complete_in_idle_cb (data=0x6d8d70) at /build/buildd/glib2.0-2.33.10/./gio/gsimpleasyncresult.c:787
        simple = <optimized out>
#14 0x00007f995571fdb5 in g_main_dispatch (context=0x6d0200) at /build/buildd/glib2.0-2.33.10/./glib/gmain.c:2707
        dispatch = 0x7f995571d200 <g_idle_dispatch>
        was_in_call = 0
        user_data = 0x6d8d70
        callback = 0x7f9955c91860 <complete_in_idle_cb>
        cb_funcs = 0x7f99559cd9a0
        cb_data = 0x6e6e00
        current_source_link = {data = 0x6e6cb0, next = 0x0}
        need_destroy = <optimized out>
        source = 0x6e6cb0
        current = 0x6ce540
        i = <optimized out>
#15 g_main_context_dispatch (context=context@entry=0x6d0200) at /build/buildd/glib2.0-2.33.10/./glib/gmain.c:3211
No locals.
#16 0x00007f99557200e8 in g_main_context_iterate (context=0x6d0200, block=block@entry=1, dispatch=dispatch@entry=1, self=<error reading variable: Unhandled dwarf expression opcode 0xfa>) at /build/buildd/glib2.0-2.33.10/./glib/gmain.c:3282
        max_priority = 0
        timeout = 0
        some_ready = 1
        nfds = <optimized out>
        allocated_nfds = <optimized out>
        fds = 0x6ddca0
#17 0x00007f99557204e2 in g_main_loop_run (loop=0x6d0180) at /build/buildd/glib2.0-2.33.10/./glib/gmain.c:3476
        __PRETTY_FUNCTION__ = "g_main_loop_run"
#18 0x0000000000401ee5 in main (argc=1, argv=0x7fffe415bfd8) at cd-main.c:617
        priv = 0x6d01c0
        immediate_exit = 0
        timed_exit = 0
        error = 0x0
        context = <optimized out>
        retval = 1
        options = {{long_name = 0x402c05 "timed-exit", short_name = 0 '\000', flags = 0, arg = G_OPTION_ARG_NONE, arg_data = 0x7fffe415be3c, description = 0x402c10 "Exit after a small delay", arg_description = 0x0}, {long_name = 0x402c29 "immediate-exit", short_name = 0 '\000', flags = 0, arg = G_OPTION_ARG_NONE, arg_data = 0x7fffe415be38, description = 0x402ce8 "Exit after the engine has loaded", arg_description = 0x0}, {long_name = 0x0, short_name = 0 '\000', flags = 0, arg = G_OPTION_ARG_NONE, arg_data = 0x0, description = 0x0, arg_description = 0x0}}