Comments (3)
anantkamath
commented on August 16, 2024
Code to reproduce this issue (using dbus-python and python2):
from dbus.mainloop.glib import DBusGMainLoop
from gi.repository import GObject
import dbus
import time
def handler(arg1=None):
print "Found renderer %r" % arg1
r = bus.get_object('com.intel.dleyna-renderer',
arg1)
#time.sleep(1) #Uncommenting this line 'fixes' this bug
props_iface = dbus.Interface(r, 'org.freedesktop.DBus.Properties')
properties = props_iface.Get("com.intel.dLeynaRenderer.RendererDevice", "FriendlyName")
print properties
DBusGMainLoop(set_as_default=True)
bus = dbus.SessionBus()
manager = bus.get_object('com.intel.dleyna-renderer',
'/com/intel/dLeynaRenderer')
manager.connect_to_signal("FoundRenderer", handler, "com.intel.dLeynaRenderer.Manager")
loop = GObject.MainLoop()
loop.run()
Steps to reproduce:
Run the script above.
If a DLNA renderer device is already running or started after the script is started results in the
GetAll call blocking and finally returning "org.freedesktop.DBus.Error.NoReply: Did not receive a reply. Possible causes include: the remote application did not send a reply, the message bus security policy blocked the reply, the reply timeout expired, or the network connection was broken."
Output:
Found renderer dbus.ObjectPath('/com/intel/dLeynaRenderer/server/0')
ERROR:dbus.connection:Exception in handler for D-Bus signal:
Traceback (most recent call last):
File "/usr/lib/python2.7/site-packages/dbus/connection.py", line 230, in maybe_handle_message
self._handler(*args, **kwargs)
File "pyd.py", line 12, in handler
properties = props_iface.Get("com.intel.dLeynaRenderer.RendererDevice", "FriendlyName")
File "/usr/lib/python2.7/site-packages/dbus/proxies.py", line 70, in __call__
return self._proxy_method(*args, **keywords)
File "/usr/lib/python2.7/site-packages/dbus/proxies.py", line 145, in __call__
**keywords)
File "/usr/lib/python2.7/site-packages/dbus/connection.py", line 651, in call_blocking
message, timeout)
DBusException: org.freedesktop.DBus.Error.NoReply: Did not receive a reply. Possible causes include: the remote application did not send a reply, the message bus security policy blocked the reply, the reply timeout expired, or the network connection was broken.
Killing and restarting the script results in all calls to the dleyna-renderer service resulting in the same error.
Uncommenting the line which adds time.sleep(1) 'fixes' the issue.
from dleyna-renderer.
phako
commented on August 16, 2024
You can/should delay the signal handler through the mainloop, in Qt you can a use Qt::QueuedConnection for this. otherwise you're deadlocking yourself.
dLeyna sends the signal, waits for it to return while you in the signal handler wait do a DBus call to dLeyna which you wait for returning => deadlock
from dleyna-renderer.
phako
commented on August 16, 2024
Although this might be related to the use of gupnp_service_info_get_introspection:
#0 0x0000003897ae4cc9 in syscall () from /export/target/bxt/f20/RFS1/lib64/libc.so.6
#1 0x000000389a28c5ff in g_cond_wait (cond=cond@entry=0x14b0358, mutex=mutex@entry=0x14b0350) at /usr/src/debug/glib-2.0/1_2.44.1-r0/glib-2.44.1/glib/gthread-posix.c:1412
#2 0x000000389c873ea4 in get_connection (should_cleanup=<optimized out>, item=0x16aa9a0) at /usr/src/debug/libsoup-2.4/2.50.0-r0/libsoup-2.50.0/libsoup/soup-session.c:1957
#3 soup_session_process_queue_item (session=<optimized out>, item=0x16aa9a0, should_cleanup=<optimized out>, loop=<optimized out>)
at /usr/src/debug/libsoup-2.4/2.50.0-r0/libsoup-2.50.0/libsoup/soup-session.c:2007
#4 0x000000389c87479e in soup_session_real_send_message (session=0x14b03a0, msg=0x14bcd50) at /usr/src/debug/libsoup-2.4/2.50.0-r0/libsoup-2.50.0/libsoup/soup-session.c:2257
#5 0x0000003899a1ce75 in gupnp_service_info_get_introspection (info=0x16c32d0, error=0x7fffbd93e8c8) at /usr/src/debug/gupnp/0.20.16-r0/gupnp-0.20.16/libgupnp/gupnp-service-info.c:599
#6 0x00007fad781d65f7 in prv_get_av_service_states_values (can_get_byte_pos=0x16af8d8, max_rate=0x16af8d0, min_rate=0x16af8c8, upnp_tp_speeds=0x16af8a8, mpris_tp_speeds=0x16af8b8,
av_proxy=0x16c32d0) at /build/tmp/work/corei7-64-mel-linux/dleyna-renderer/0.6.0-r0/git/libdleyna/renderer/device.c:2156
#7 prv_props_update (device=0x16af850, task=0x14dd500)
at /build/tmp/work/corei7-64-mel-linux/dleyna-renderer/0.6.0-r0/git/libdleyna/renderer/device.c:2391
#8 0x00007fad781d7c51 in dlr_device_get_prop (device=<optimized out>, task=0x14dd500, cb=<optimized out>)
at /build/tmp/work/corei7-64-mel-linux/dleyna-renderer/0.6.0-r0/git/libdleyna/renderer/device.c:2722
#9 0x00007fad77fbfbcf in prv_process_task (user_data=0x14e8380) at /usr/src/debug/dleyna-core/0.6.0-r0/git/libdleyna/core/task-processor.c:382
#10 0x000000389a24873a in g_main_dispatch (context=0x145f130) at /usr/src/debug/glib-2.0/1_2.44.1-r0/glib-2.44.1/glib/gmain.c:3122
#11 g_main_context_dispatch (context=context@entry=0x145f130) at /usr/src/debug/glib-2.0/1_2.44.1-r0/glib-2.44.1/glib/gmain.c:3737
#12 0x000000389a248ab8 in g_main_context_iterate (context=0x145f130, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>)
at /usr/src/debug/glib-2.0/1_2.44.1-r0/glib-2.44.1/glib/gmain.c:3808
#13 0x000000389a248dd2 in g_main_loop_run (loop=0x1478140) at /usr/src/debug/glib-2.0/1_2.44.1-r0/glib-2.44.1/glib/gmain.c:4002
#14 0x00007fad77fbedbc in dleyna_main_loop_start (server=<optimized out>, control_point=<optimized out>, user_data=0x0) at /usr/src/debug/dleyna-core/0.6.0-r0/git/libdleyna/core/main-loop.c:158
#15 0x0000003897a205e0 in __libc_start_main () from /export/target/bxt/f20/RFS1/lib64/libc.so.6
#16 0x0000000000400979 in _start ()
from dleyna-renderer.
Related Issues (20)
- Move code to GUPnP
- Changes to properties such as CanPlay, CanPause are not notified HOT 1
- org.mpris.MediaPlayer2.Player.Rate change should change playspeed
- Dleyna Renderer doesnt notify when the DMR properties changes HOT 5
- rendererconsole.py does not handle errors when calling dbus methods
- Don't use deprecated gupnp_context_get_host_ip
- unknown crash SIGSEGV (#0 0x0000003e51238df4 in g_hash_table_lookup_node (hash_return=<synthetic pointer>, key=0xfe10f0, hash_table=0x752d73616d656863) at ghash.c:368) HOT 22
- crash in dlr_host_service_lost_client() HOT 5
- Failed to access the hosted files when they are big
- No way to access album art or thumbnails HOT 4
- Renderer sends empty xsesam:artist or xsesam:albumArtist
- Please fix use of gupnp_service_info_get_introspection HOT 1
- Uninitialized argument value in prv_open_uri_cb HOT 2
- dleyna-renderer crash very often HOT 2
- Not shutting down on SIGTERM HOT 27
- possible memory leak on function dlr_device_construct, libdleyna/renderer/device.c HOT 6
- 0.6.0: does not build against gupnp 1.2 HOT 5
- Is one-to-one communication supported? HOT 1
- Missing TLS certificate verification
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