In Fedora 20 when trying to mount an archive using the Archive Mounter, several users reported a crash. I get it 100% of times when trying to mount a LiveCD of F20 Alpha.

udisks2-2.1.1-1.fc20

https://bugzilla.redhat.com/show_bug.cgi?id=1007223

Thread 1 (Thread 0x7fdc82480700 (LWP 5888)):
#0  0x00007fdc84fbb6ff in g_dbus_object_get_interface (object=0x0, interface_name=0x7fdc85296ab1 "org.freedesktop.UDisks2.Block") at gdbusobject.c:144
        iface = <optimized out>
        __PRETTY_FUNCTION__ = "g_dbus_object_get_interface"
#1  0x00007fdc8528f2b3 in udisks_object_peek_block (object=0x0) at udisks-generated.c:31007
        ret = <optimized out>
#2  0x00007fdc86358e37 in wait_for_loop_object (daemon=0x7fdc879cd640, user_data=0x7fdc8247d500) at udiskslinuxmanager.c:233
        ret = 0x0
        object = 0x0
        block = <optimized out>
        loop = <optimized out>
        device = 0x0
        dir = <optimized out>
#3  0x00007fdc8633ba3f in udisks_daemon_wait_for_object_sync (daemon=0x7fdc879cd640, wait_func=wait_func@entry=0x7fdc86358df0 <wait_for_loop_object>, user_data=user_data@entry=0x7fdc8247d500, user_data_free_func=user_data_free_func@entry=0x0, timeout_seconds=timeout_seconds@entry=10, error=error@entry=0x7fdc8247d4e8) at udisksdaemon.c:884
        ret = <optimized out>
        data = {context = 0x0, loop = 0x0, timed_out = 0}
        __PRETTY_FUNCTION__ = "udisks_daemon_wait_for_object_sync"
#4  0x00007fdc8635a002 in handle_loop_setup (object=0x7fdc74005ea0, invocation=0x7fdc7400ae70, fd_list=<optimized out>, fd_index=<optimized out>, options=<optimized out>) at udiskslinuxmanager.c:450
        manager = 0x7fdc74005ea0
        error = 0x0
        fd_num = <optimized out>
        fd = 15
        proc_path = "/proc/1552/fd/15\000\000\000\000\000\000\000\000\002", '\000' <repeats 31 times>, "\002\000\000\000\000\000\000"
        path = "/home/rizvan/Downloads/Fedora-20-Nightly-x86_64-Live-desktop-20130828.08-1.iso", '\000' <repeats 674 times>...
        loop_fd = 17
        loop_control_fd = <optimized out>
        allocated_loop_number = <optimized out>
        loop_device = 0x7fdc7401c130 "/dev/loop0"
        li64 = {lo_device = 0, lo_inode = 0, lo_rdevice = 0, lo_offset = 0, lo_sizelimit = 0, lo_number = 0, lo_encrypt_type = 0, lo_encrypt_key_size = 0, lo_flags = 9, lo_file_name = "/home/rizvan/Downloads/Fedora-20-Nightly-x86_64-Live-desktop-20", lo_crypt_name = '\000' <repeats 63 times>, lo_encrypt_key = '\000' <repeats 31 times>, lo_init = {0, 0}}
        loop_object = 0x0
        option_read_only = 1
        option_no_part_scan = 0
        option_offset = 0
        option_size = 0
        caller_uid = 1000
        fd_statbuf = {st_dev = 64773, st_ino = 262980, st_nlink = 1, st_mode = 33184, st_uid = 1000, st_gid = 1000, __pad0 = 0, st_rdev = 0, st_size = 1044381696, st_blksize = 4096, st_blocks = 2039816, st_atim = {tv_sec = 1377762146, tv_nsec = 3029282}, st_mtim = {tv_sec = 1377762075, tv_nsec = 203231809}, st_ctim = {tv_sec = 1377762096, tv_nsec = 131876774}, __unused = {0, 0, 0}}
        fd_statbuf_valid = <optimized out>
        wait_data = {loop_device = 0x7fdc7401c130 "/dev/loop0", path = 0x7fdc8247d6d0 "/home/rizvan/Downloads/Fedora-20-Nightly-x86_64-Live-desktop-20130828.08-1.iso"}
        __FUNCTION__ = "handle_loop_setup"
#5  0x00007fdc8331dd8c in ffi_call_unix64 () at ../src/x86/unix64.S:76
No locals.
#6  0x00007fdc8331d6bc in ffi_call (cif=cif@entry=0x7fdc8247f940, fn=0x7fdc86359b80 <handle_loop_setup>, rvalue=0x7fdc8247f8b0, avalue=avalue@entry=0x7fdc8247f830) at ../src/x86/ffi64.c:522
        classes = {X86_64_INTEGER_CLASS, 32732, 2185754944, 32732}
        stack = 0x7fdc8247f670 "\240^"
        argp = 0x7fdc8247f720 "\n"
        arg_types = <optimized out>
        gprcount = 6
        ssecount = <optimized out>
        ngpr = 1
        nsse = 0
        i = <optimized out>
        avn = <optimized out>
        ret_in_memory = <optimized out>
        reg_args = 0x7fdc8247f670
#7  0x00007fdc84c99c48 in g_cclosure_marshal_generic (closure=0x7fdc879e09e0, return_gvalue=0x7fdc8247faa0, n_param_values=<optimized out>, param_values=<optimized out>, invocation_hint=<optimized out>, marshal_data=0x7fdc86359b80 <handle_loop_setup>) at gclosure.c:1454
        rtype = <optimized out>
        rvalue = 0x7fdc8247f8b0
        n_args = 6
        atypes = <optimized out>
        i = <optimized out>
        cif = {abi = FFI_UNIX64, nargs = 6, arg_types = 0x7fdc8247f870, rtype = 0x7fdc8331e0c0 <ffi_type_sint32>, bytes = 0, flags = 10}
        cc = 0x7fdc879e09e0
        enum_tmpval = <optimized out>
        tmpval_used = 0
#8  0x00007fdc84c99408 in g_closure_invoke (closure=closure@entry=0x7fdc879e09e0, return_value=return_value@entry=0x7fdc8247faa0, n_param_values=5, param_values=param_values@entry=0x7fdc74011b30, invocation_hint=invocation_hint@entry=0x7fdc8247faf0) at gclosure.c:777
        marshal = 0x7fdc84c97d70 <g_type_iface_meta_marshal>
        marshal_data = 0x10
        in_marshal = 0
        real_closure = 0x7fdc879e09c0
        __PRETTY_FUNCTION__ = "g_closure_invoke"
#9  0x00007fdc84cabd6b in signal_emit_unlocked_R (node=node@entry=0x7fdc879f0cf0, detail=detail@entry=0, instance=instance@entry=0x7fdc74005ea0, emission_return=emission_return@entry=0x7fdc8247fc50, instance_and_params=instance_and_params@entry=0x7fdc74011b30) at gsignal.c:3624
        accumulator = 0x7fdc879f0d90
        emission = {next = 0x0, instance = 0x7fdc74005ea0, ihint = {signal_id = 24, detail = 0, run_type = G_SIGNAL_RUN_LAST}, state = EMISSION_RUN, chain_type = 140585144887680}
        handler_list = 0x0
        return_accu = 0x7fdc8247faa0
        accu = {g_type = 20, data = {{v_int = 0, v_uint = 0, v_long = 0, v_ulong = 0, v_int64 = 0, v_uint64 = 0, v_float = 0, v_double = 0, v_pointer = 0x0}, {v_int = 0, v_uint = 0, v_long = 0, v_ulong = 0, v_int64 = 0, v_uint64 = 0, v_float = 0, v_double = 0, v_pointer = 0x0}}}
        signal_id = 24
        max_sequential_handler_number = 103
        return_value_altered = 0
#10 0x00007fdc84cb3147 in g_signal_emitv (instance_and_params=instance_and_params@entry=0x7fdc74011b30, signal_id=signal_id@entry=24, detail=detail@entry=0, return_value=return_value@entry=0x7fdc8247fc50) at gsignal.c:3063
        instance = 0x7fdc74005ea0
        node = 0x7fdc879f0cf0
        param_values = 0x7fdc74011b48
        i = <optimized out>
        __PRETTY_FUNCTION__ = "g_signal_emitv"
#11 0x00007fdc8526f861 in _udisks_manager_skeleton_handle_method_call (connection=<optimized out>, sender=sender@entry=0x7fdc78002d40 ":1.125", object_path=object_path@entry=0x7fdc78002f10 "/org/freedesktop/UDisks2/Manager", interface_name=interface_name@entry=0x7fdc780054a0 "org.freedesktop.UDisks2.Manager", method_name=method_name@entry=0x7fdc78004d40 "LoopSetup", parameters=parameters@entry=0x7fdc87a8e920, invocation=invocation@entry=0x7fdc7400ae70, user_data=user_data@entry=0x7fdc74005ea0) at udisks-generated.c:1305
        skeleton = <optimized out>
        info = 0x7fdc854b3f80 <_udisks_manager_method_info_loop_setup>
        iter = {x = {140585145526560, 2, 2, 0, 2032, 140584815734384, 140585055288692, 3579507750, 0, 140585094511491, 140584815691968, 140585094053223, 27, 140585088326346, 2032, 140584815691968}}
        child = 0x0
        paramv = 0x7fdc74011b30
        num_params = <optimized out>
        num_extra = <optimized out>
        n = <optimized out>
        signal_id = 24
        return_value = {g_type = 20, data = {{v_int = 0, v_uint = 0, v_long = 0, v_ulong = 0, v_int64 = 0, v_uint64 = 0, v_float = 0, v_double = 0, v_pointer = 0x0}, {v_int = 0, v_uint = 0, v_long = 0, v_ulong = 0, v_int64 = 0, v_uint64 = 0, v_float = 0, v_double = 0, v_pointer = 0x0}}}
        __FUNCTION__ = "_udisks_manager_skeleton_handle_method_call"
#12 0x00007fdc84fba1d0 in dispatch_in_thread_func (task=<optimized out>, source_object=<optimized out>, task_data=<optimized out>, cancellable=<optimized out>) at gdbusinterfaceskeleton.c:536
        run_in_thread = <optimized out>
        data = <optimized out>
        flags = <optimized out>
        object = 0x7fdc879d4470
        authorized = 1
#13 0x00007fdc84f5b415 in g_task_thread_pool_thread (thread_data=0x7fdc87ab9100, pool_data=<optimized out>) at gtask.c:1245
        task = 0x7fdc87ab9100
#14 0x00007fdc849cc5f6 in g_thread_pool_thread_proxy (data=<optimized out>) at gthreadpool.c:309
        task = 0x7fdc87ab9100
        pool = 0x7fdc879dacc0
#15 0x00007fdc849cbc35 in g_thread_proxy (data=0x7fdc879f9720) at gthread.c:798
        thread = 0x7fdc879f9720
#16 0x00007fdc84747f33 in start_thread (arg=0x7fdc82480700) at pthread_create.c:309
        __res = <optimized out>
        pd = 0x7fdc82480700
        now = <optimized out>
        unwind_buf = {cancel_jmp_buf = {{jmp_buf = {140585055291136, 3908043725653368695, 0, 0, 140585055291840, 140585055291136, -3925681335267270793, -3925694147126009993}, mask_was_saved = 0}}, priv = {pad = {0x0, 0x0, 0x0, 0x0}, data = {prev = 0x0, cleanup = 0x0, canceltype = 0}}}
        not_first_call = <optimized out>
        pagesize_m1 = <optimized out>
        sp = <optimized out>
        freesize = <optimized out>
#17 0x00007fdc84475ddd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:111