this report has been filed here: https://bugs.launchpad.net/ubuntu/+source/upower/+bug/870593 there's no specific steps on how to reproduce the crash, most of users are commenting that the crash appears just after login. Btw is this more like a libplist issue? Thanks!. ". Thread 3 (Thread 0x7f590e702700 (LWP 1489)): #0 0x00007f5911ecc0dd in read () at ../sysdeps/unix/syscall-template.S:82 No locals. #1 0x00007f591159ea83 in read (__nbytes=128, __buf=0x7f590e701d30, __fd=<optimized out>) at /usr/include/x86_64-linux-gnu/bits/unistd.h:45 No locals. #2 unix_signal_helper_thread (data=<optimized out>) at /build/buildd/glib2.0-2.30.0/./glib/gmain.c:4567 i = <optimized out> bytes_read = 140020529529296 b = '\000' <repeats 16 times>"\377, \377\377\377", '\000' <repeats 28 times>"\320, \200!", '\000' <repeats 21 times>, "\003\000\000\000\000\000\000\000\000\320\353\021Y\177\000\000\264\377\277\022Y\177\000\000\005", '\000' <repeats 23 times>"\220, &\332\020Y\177\000" sigterm_received = 0 sigint_received = 0 sighup_received = 0 #3 0x00007f59115c82b6 in g_thread_create_proxy (data=0x2290ea0) at /build/buildd/glib2.0-2.30.0/./glib/gthread.c:1962 thread = 0x2290ea0 __PRETTY_FUNCTION__ = "g_thread_create_proxy" #4 0x00007f5911ec4efc in start_thread (arg=0x7f590e702700) at pthread_create.c:304 __res = <optimized out> pd = 0x7f590e702700 now = <optimized out> unwind_buf = {cancel_jmp_buf = {{jmp_buf = {0, 6404682131891087322, 140734146252624, 140020471048640, 0, 3, -6462634030028757030, -6462626227677239334}, mask_was_saved = 0}}, priv = {pad = {0x0, 0x0, 0x0, 0x0}, data = {prev = 0x0, cleanup = 0x0, canceltype = 0}}} not_first_call = 0 robust = <optimized out> pagesize_m1 = <optimized out> sp = <optimized out> freesize = <optimized out> __PRETTY_FUNCTION__ = "start_thread" #5 0x00007f5910e7a89d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112 No locals. #6 0x0000000000000000 in ?? () No symbol table info available. . Thread 2 (Thread 0x7f590df01700 (LWP 1490)): #0 0x00007f5910e6e773 in __GI___poll (fds=<optimized out>, nfds=<optimized out>, timeout=<optimized out>) at ../sysdeps/unix/sysv/linux/poll.c:87 resultvar = <optimized out> oldtype = 0 result = <optimized out> #1 0x00007f59115a2f68 in g_main_context_poll (n_fds=3, fds=0x7f5908001100, timeout=-1, context=0x22a2aa0, priority=<optimized out>) at /build/buildd/glib2.0-2.30.0/./glib/gmain.c:3402 poll_func = 0x7f59115b14c0 <g_poll> #2 g_main_context_iterate (context=0x22a2aa0, block=<optimized out>, dispatch=1, self=<optimized out>) at /build/buildd/glib2.0-2.30.0/./glib/gmain.c:3084 max_priority = 2147483647 timeout = -1 some_ready = <optimized out> nfds = 3 allocated_nfds = <optimized out> fds = 0x7f5908001100 #3 0x00007f59115a3792 in g_main_loop_run (loop=0x22a2a50) at /build/buildd/glib2.0-2.30.0/./glib/gmain.c:3297 __PRETTY_FUNCTION__ = "g_main_loop_run" #4 0x00007f5910b15516 in gdbus_shared_thread_func (user_data=0x22a2a70) at /build/buildd/glib2.0-2.30.0/./gio/gdbusprivate.c:276 data = 0x22a2a70 #5 0x00007f59115c82b6 in g_thread_create_proxy (data=0x22a2b90) at /build/buildd/glib2.0-2.30.0/./glib/gthread.c:1962 thread = 0x22a2b90 __PRETTY_FUNCTION__ = "g_thread_create_proxy" #6 0x00007f5911ec4efc in start_thread (arg=0x7f590df01700) at pthread_create.c:304 __res = <optimized out> pd = 0x7f590df01700 now = <optimized out> unwind_buf = {cancel_jmp_buf = {{jmp_buf = {0, 6404682131891087322, 140734146249920, 140020462655936, 0, 3, -6462635129003513894, -6462626227677239334}, mask_was_saved = 0}}, priv = {pad = {0x0, 0x0, 0x0, 0x0}, data = {prev = 0x0, cleanup = 0x0, canceltype = 0}}} not_first_call = 0 robust = <optimized out> pagesize_m1 = <optimized out> sp = <optimized out> freesize = <optimized out> __PRETTY_FUNCTION__ = "start_thread" #7 0x00007f5910e7a89d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112 No locals. #8 0x0000000000000000 in ?? () No symbol table info available. . Thread 1 (Thread 0x7f5912de27c0 (LWP 1486)): #0 node_list_remove (list=0x1a74000000cab800, node=0x7f5911852840) at /build/buildd/libplist-1.6/libcnary/node_list.c:122 n = <optimized out> #1 0x00007f591113e80e in node_detach (parent=0x7f5911ec97f0, child=<optimized out>) at /build/buildd/libplist-1.6/libcnary/node.c:99 No locals. #2 0x00007f591113a315 in plist_free_node (node=0x7f5911852840) at /build/buildd/libplist-1.6/src/plist.c:73 data = 0x0 ni = <optimized out> ch = <optimized out> #3 0x0000000000412a0e in up_device_idevice_coldplug (device=0x22b3190) at up-device-idevice.c:117 idevice = 0x22b3190 native = 0x22c4450 uuid = 0x228d450 "d08f22fdf4f57e5cc090926e24282cede4eada1e" model = <optimized out> dict = 0x7f5911852840 node = <optimized out> poll_seconds = 60 dev = 0x228d670 client = 0x2292620 kind = <optimized out> #4 0x000000000040b2c9 in up_device_coldplug (device=0x22b3190, daemon=<optimized out>, native=0x22c4450) at up-device.c:548 ret = <optimized out> native_path = <optimized out> klass = 0x229b910 id = 0x0 __PRETTY_FUNCTION__ = "up_device_coldplug" #5 0x0000000000411548 in up_backend_device_new (native=0x22c4450, backend=0x22a6ed0) at up-backend.c:128 native_path = <optimized out> device = 0x22b3190 ret = <optimized out> subsys = <optimized out> input = <optimized out> #6 up_backend_device_add (backend=0x22a6ed0, native=0x22c4450) at up-backend.c:229 object = <optimized out> device = <optimized out> #7 0x00007f59118630a4 in g_closure_invoke (closure=0x229aff0, return_value=0x0, n_param_values=3, param_values=0x7f5908003de0, invocation_hint=<optimized out>) at /build/buildd/glib2.0-2.30.0/./gobject/gclosure.c:774 marshal = 0x7f5911aaadc8 <g_udev_marshal_VOID__STRING_OBJECT> marshal_data = <optimized out> in_marshal = <optimized out> __PRETTY_FUNCTION__ = "g_closure_invoke" #8 0x00007f591187502a in signal_emit_unlocked_R (node=<optimized out>, detail=0, instance=0x2294b40, emission_return=0x0, instance_and_params=0x7f5908003de0) at /build/buildd/glib2.0-2.30.0/./gobject/gsignal.c:3272 tmp = <optimized out> handler = 0x7f5908006ed0 accumulator = 0x0 emission = {next = 0x0, instance = 0x2294b40, ihint = {signal_id = 24, detail = 0, run_type = G_SIGNAL_RUN_FIRST}, state = EMISSION_RUN, chain_type = 4} class_closure = 0x22a8490 hlist = 0x7f5911ec81d0 handler_list = 0x7f5908006ed0 return_accu = 0x0 accu = {g_type = 0, 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 = 208 return_value_altered = 0 #9 0x00007f591187e6b1 in g_signal_emit_valist (instance=<optimized out>, signal_id=<optimized out>, detail=<optimized out>, var_args=<optimized out>) at /build/buildd/glib2.0-2.30.0/./gobject/gsignal.c:3003 instance_and_params = 0x7f5908003de0 signal_return_type = 4 param_values = 0x7f5908003df8 node = 0x22a7d20 i = <optimized out> n_params = 2 __PRETTY_FUNCTION__ = "g_signal_emit_valist" #10 0x00007f591187e852 in g_signal_emit (instance=<optimized out>, signal_id=<optimized out>, detail=<optimized out>) at /build/buildd/glib2.0-2.30.0/./gobject/gsignal.c:3060 var_args = {{gp_offset = 40, fp_offset = 48, overflow_arg_area = 0x7fff38cb9030, reg_save_area = 0x7fff38cb8f70}} #11 0x00007f5911aa8aac in ?? () from /tmp/tmpXgDO0d/usr/lib/x86_64-linux-gnu/libgudev-1.0.so.0 No symbol table info available. #12 0x00007f59115a2a5d in g_main_dispatch (context=0x228ff30) at /build/buildd/glib2.0-2.30.0/./glib/gmain.c:2441 dispatch = 0x7f59115e5160 <g_io_unix_dispatch> was_in_call = 0 user_data = 0x2294b40 callback = 0x7f5911aa8a58 cb_funcs = 0x7f5911852670 cb_data = 0x229b0f0 current_source_link = {data = 0x229b5d0, next = 0x0} need_destroy = <optimized out> source = 0x229b5d0 current = 0x229fe00 i = <optimized out> #13 g_main_context_dispatch (context=0x228ff30) at /build/buildd/glib2.0-2.30.0/./glib/gmain.c:3011 No locals. #14 0x00007f59115a3258 in g_main_context_iterate (context=0x228ff30, block=<optimized out>, dispatch=1, self=<optimized out>) at /build/buildd/glib2.0-2.30.0/./glib/gmain.c:3089 max_priority = 2147483647 timeout = -1 some_ready = 1 nfds = 4 allocated_nfds = <optimized out> fds = <optimized out> #15 0x00007f59115a3792 in g_main_loop_run (loop=0x22a8030) at /build/buildd/glib2.0-2.30.0/./glib/gmain.c:3297 __PRETTY_FUNCTION__ = "g_main_loop_run" #16 0x0000000000406a2b in main (argc=1, argv=0x7fff38cb9398) at up-main.c:241 error = 0x0 daemon = 0x22a18e0 qos = 0x2291240 kbd_backlight = 0x2294b00 wakeups = 0x229eb20 context = <optimized out> bus_proxy = <optimized out> bus = <optimized out> ret = <optimized out> retval = 1 timed_exit = 0 immediate_exit = 0 session_bus = 0 timer_id = <optimized out> options = {{long_name = 0x41b9a8 "timed-exit", short_name = 0 '\000', flags = 0, arg = G_OPTION_ARG_NONE, arg_data = 0x7fff38cb9280, description = 0x41b9b3 "Exit after a small delay", arg_description = 0x0}, {long_name = 0x41b9cc "immediate-exit", short_name = 0 '\000', flags = 0, arg = G_OPTION_ARG_NONE, arg_data = 0x7fff38cb9284, description = 0x41ba70 "Exit after the engine has loaded", arg_description = 0x0}, {long_name = 0x41b9db "test", short_name = 0 '\000', flags = 0, arg = G_OPTION_ARG_NONE, arg_data = 0x7fff38cb9288, description = 0x41ba98 "Run on the session bus (only for testing)", 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}}"
It's either a bug in libimobiledevice, or our use of it. I cannot reproduce the problem locally, and the last bug dates back from 2012. As nothing changed on the UPower side, it's likely a problem lower down the stack.
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