Perpetually Downloading Resources (Even for empty Worlds) Garden Gazebo

[Bezalelohim]

OS Version: Ubuntu 22.04 LTS
Gazebo Garden Version 7.2.0
Binary Build(SAME ISSUE WITH SOURCE BUILD
Intel Core i3
Integrated Graphic Card

MAIN REPEATING ERROR
[GUI] [Dbg] [Gui.cc:340] GUI requesting list of world names. The server may be busy downloading resources. Please be patient.

• The GUI is unreponsive when opened using gz command taking a look using the verbose command.
• I found an error log from the terminal.
• One line keeps repeating, " the requesting list of world names and the server maybe busy downloading them" .
• Even tried this with a locally downloaded world and same result.

Measures Taken

• Tried reopening with and without network connectivity [same result] .
• Reinstalled gazebo garden and ros2 humble multiple times.

FULL ERROR LOG FROM TERMINAL

joerops@joerops:~$ gz sim empty.sdf -v 4
[Msg] Gazebo Sim GUI    v7.2.0
[Dbg] [gz.cc:162] Subscribing to [/gazebo/starting_world].
[Dbg] [gz.cc:164] Waiting for a world to be set from the GUI...
[Dbg] [Gui.cc:260] Waiting for subscribers to [/gazebo/starting_world]...
[Wrn] [Gui.cc:268] Waited for 10s for a subscriber to [/gazebo/starting_world] and got none.
[Dbg] [Application.cc:96] Initializing application.
[Dbg] [Application.cc:122] Qt using OpenGL graphics interface
[GUI] [Dbg] [Application.cc:596] Create main window
[GUI] [Wrn] [Application.cc:845] [QT] qrc:/qml/StyleDialog.qml:112:3: QML Connections: Implicitly defined onFoo properties in Connections are deprecated. Use this syntax instead: function onFoo(<arguments>) { ... }
[GUI] [Wrn] [Application.cc:845] [QT] qrc:/qml/StyleDialog.qml:105:3: QML Connections: Implicitly defined onFoo properties in Connections are deprecated. Use this syntax instead: function onFoo(<arguments>) { ... }
[GUI] [Wrn] [Application.cc:845] [QT] qrc:/qml/StyleDialog.qml:98:3: QML Connections: Implicitly defined onFoo properties in Connections are deprecated. Use this syntax instead: function onFoo(<arguments>) { ... }
[GUI] [Wrn] [Application.cc:845] [QT] qrc:qml/Main.qml:102:3: QML Connections: Implicitly defined onFoo properties in Connections are deprecated. Use this syntax instead: function onFoo(<arguments>) { ... }
[GUI] [Wrn] [Application.cc:845] [QT] qrc:/qml/PluginMenu.qml:27:3: QML Connections: Implicitly defined onFoo properties in Connections are deprecated. Use this syntax instead: function onFoo(<arguments>) { ... }
[GUI] [Dbg] [PathManager.cc:67] Requesting resource paths through [/gazebo/resource_paths/get]
[GUI] [Wrn] [Application.cc:845] [QT] file::/Gazebo/GazeboDrawer.qml:241:3: QML Connections: Implicitly defined onFoo properties in Connections are deprecated. Use this syntax instead: function onFoo(<arguments>) { ... }
[GUI] [Wrn] [Application.cc:845] [QT] file::/Gazebo/GazeboDrawer.qml:147:3: QML Dialog: Binding loop detected for property "implicitHeight"
[GUI] [Wrn] [Application.cc:845] [QT] file::/Gazebo/GazeboDrawer.qml:147:3: QML Dialog: Binding loop detected for property "implicitHeight"
[GUI] [Dbg] [Gui.cc:340] GUI requesting list of world names. The server may be busy downloading resources. Please be patient.
[GUI] [Dbg] [Gui.cc:340] GUI requesting list of world names. The server may be busy downloading resources. Please be patient.
[GUI] [Dbg] [Gui.cc:340] GUI requesting list of world names. The server may be busy downloading resources. Please be patient.
[GUI] [Dbg] [Gui.cc:340] GUI requesting list of world names. The server may be busy downloading resources. Please be patient.
[GUI] [Dbg] [Gui.cc:340] GUI requesting list of world names. The server may be busy downloading resources. Please be patient.
[GUI] [Dbg] [Gui.cc:340] GUI requesting list of world names. The server may be busy downloading resources. Please be patient.
[GUI] [Dbg] [Gui.cc:340] GUI requesting list of world names. The server may be busy downloading resources. Please be patient.
[GUI] [Dbg] [Gui.cc:340] GUI requesting list of world names. The server may be busy downloading resources. Please be patient.
[GUI] [Dbg] [Gui.cc:340] GUI requesting list of world names. The server may be busy downloading resources. Please be patient.

[azeey]

I'm unable to reproduce this error locally. " The server may be busy downloading resources...." message can be misleading because it is printed any time gz sim GUI (the client) is trying to communicate with the gz sim server and fails. The majority of the time, this communication failure happens because the server is downloading models from Fuel, but that's probably not the case here because you're loading empty.sdf.

Is it possible you have other instances of gz sim running? In my logs I see both "[Msg] Gazebo Sim GUI " and "[Msg] Gazebo Sim Server", but in yours I only see the former.

[Bezalelohim]

I have deleted gazebo sim and command gz is not recognized in the terminal now
Also is there a process I should kill in system monitor/htop ?

[Bezalelohim]

This seems to be the start of error from error log

    [GUI] [Dbg] [Gui.cc:260] Waiting for subscribers to [/gazebo/starting_world]...
    [GUI] [Wrn] [Gui.cc:268] Waited for 10s for a subscriber to [/gazebo/starting_world] and got none.

Usually the message should be that subsribers should be recieved. And the world (empty.sdf) just begins loading.

You can cross check with my logs and the logs of the working gz sim on your system.

[Bezalelohim]

Is it possible you have other instances of gz sim running? In my logs I see both "[Msg] Gazebo Sim GUI " and "[Msg] Gazebo Sim Server", but in yours I only see the former.

I have made sure to kill all other instances gone deleted all traces of gazebo (to my knowledge) and still the error remains

[Bezalelohim]

In my logs I see both "[Msg] Gazebo Sim GUI " and "[Msg] Gazebo Sim Server", but in yours I only see the former.

Yeah probably as the gazebo gui doesn't connect with gazebo server and tries to initialize that connection with the server over and over again

[ShevaDavid]

Have the same problem on mac OS Ventura
Gazebo Sim GUI v7.4.0

gz sim -v4 -r -g shapes.sdf

[Msg] Gazebo Sim GUI v7.4.0
[Dbg] [Application.cc:96] Initializing application.
[Dbg] [Application.cc:104] Qt using Metal graphics interface
[GUI] [Dbg] [Application.cc:596] Create main window
[GUI] [Wrn] [Application.cc:845] [QT] Populating font family aliases took 129 ms. Replace uses of missing font family "Roboto" with one that exists to avoid this cost.
[GUI] [Wrn] [Application.cc:845] [QT] qrc:/qml/StyleDialog.qml:112:3: QML Connections: Implicitly defined onFoo properties in Connections are deprecated. Use this syntax instead: function onFoo() { ... }
[GUI] [Wrn] [Application.cc:845] [QT] qrc:/qml/StyleDialog.qml:105:3: QML Connections: Implicitly defined onFoo properties in Connections are deprecated. Use this syntax instead: function onFoo() { ... }
[GUI] [Wrn] [Application.cc:845] [QT] qrc:/qml/StyleDialog.qml:98:3: QML Connections: Implicitly defined onFoo properties in Connections are deprecated. Use this syntax instead: function onFoo() { ... }
[GUI] [Wrn] [Application.cc:845] [QT] qrc:qml/Main.qml:102:3: QML Connections: Implicitly defined onFoo properties in Connections are deprecated. Use this syntax instead: function onFoo() { ... }
[GUI] [Wrn] [Application.cc:845] [QT] qrc:/qml/PluginMenu.qml:27:3: QML Connections: Implicitly defined onFoo properties in Connections are deprecated. Use this syntax instead: function onFoo() { ... }
[GUI] [Dbg] [PathManager.cc:67] Requesting resource paths through [/gazebo/resource_paths/get]
[GUI] [Wrn] [Application.cc:845] [QT] file::/Gazebo/GazeboDrawer.qml:241:3: QML Connections: Implicitly defined onFoo properties in Connections are deprecated. Use this syntax instead: function onFoo() { ... }
[GUI] [Wrn] [Application.cc:845] [QT] file::/Gazebo/GazeboDrawer.qml:147:3: QML Dialog: Binding loop detected for property "implicitHeight"
[GUI] [Wrn] [Application.cc:845] [QT] file::/Gazebo/GazeboDrawer.qml:147:3: QML Dialog: Binding loop detected for property "implicitHeight"
[GUI] [Dbg] [Gui.cc:340] GUI requesting list of world names. The server may be busy downloading resources. Please be patient.
[GUI] [Dbg] [Gui.cc:340] GUI requesting list of world names. The server may be busy downloading resources. Please be patient.
[GUI] [Dbg] [Gui.cc:340] GUI requesting list of world names. The server may be busy downloading resources. Please be patient.
[GUI] [Dbg] [Gui.cc:340] GUI requesting list of world names. The server may be

[azeey]

@Bezalelohim can you run just the server with -s and see the logs, i.e., gz sim -v4 -s -r empty.world? Once that starts, you can inspect the services advertised by the server with gz service -l.

@ShevaDavid not sure why you're running with -g. That runs just the gui without the server. You need both to be running. Can you try without the -g?

[azeey]

Any update on this @Bezalelohim ?

[Bezalelohim]

Log
When running gz sim -v4 -s -r empty.sdf

[Msg] Loading SDF world file[/usr/share/gz/gz-sim7/worlds/empty.sdf].
[Msg] Serving entity system service on [/entity/system/add]
[Dbg] [Physics.cc:869] Loaded [gz::physics::dartsim::Plugin] from library [/usr/lib/x86_64-linux-gnu/gz-physics-6/engine-plugins/libgz-physics-dartsim-plugin.so]
[Dbg] [SystemManager.cc:74] Loaded system [gz::sim::systems::Physics] for entity [1]
[Msg] Create service on [/world/empty/create]
[Msg] Remove service on [/world/empty/remove]
[Msg] Pose service on [/world/empty/set_pose]
[Msg] Pose service on [/world/empty/set_pose_vector]
[Msg] Light configuration service on [/world/empty/light_config]
[Msg] Physics service on [/world/empty/set_physics]
[Msg] SphericalCoordinates service on [/world/empty/set_spherical_coordinates]
[Msg] Enable collision service on [/world/empty/enable_collision]
[Msg] Disable collision service on [/world/empty/disable_collision]
[Msg] Material service on [/world/empty/visual_config]
[Msg] Material service on [/world/empty/wheel_slip]
[Dbg] [SystemManager.cc:74] Loaded system [gz::sim::systems::UserCommands] for entity [1]
[Dbg] [SystemManager.cc:74] Loaded system [gz::sim::systems::SceneBroadcaster] for entity [1]
[Dbg] [SystemManager.cc:74] Loaded system [gz::sim::systems::Contact] for entity [1]
[Msg] Loaded level [3]
[Msg] Serving world controls on [/world/empty/control], [/world/empty/control/state] and [/world/empty/playback/control]
[Msg] Serving GUI information on [/world/empty/gui/info]
[Msg] World [empty] initialized with [1ms] physics profile.
[Msg] Serving world SDF generation service on [/world/empty/generate_world_sdf]
[Msg] Serving world names on [/gazebo/worlds]
[Msg] Resource path add service on [/gazebo/resource_paths/add].
[Msg] Resource path get service on [/gazebo/resource_paths/get].
[Msg] Resource path resolve service on [/gazebo/resource_paths/resolve].
[Msg] Resource paths published on [/gazebo/resource_paths].
[Msg] Server control service on [/server_control].
[Msg] Found no publishers on /stats, adding root stats topic
[Msg] Found no publishers on /clock, adding root clock topic
[Dbg] [SimulationRunner.cc:513] Creating PostUpdate worker threads: 3
[Dbg] [SimulationRunner.cc:524] Creating postupdate worker thread (0)
[Dbg] [SimulationRunner.cc:524] Creating postupdate worker thread (1)
[Msg] Serving scene information on [/world/empty/scene/info]
[Msg] Serving graph information on [/world/empty/scene/graph]
[Msg] Serving full state on [/world/empty/state]
[Msg] Serving full state (async) on [/world/empty/state_async]
[Msg] Publishing scene information on [/world/empty/scene/info]
[Msg] Publishing entity deletions on [/world/empty/scene/deletion]
[Msg] Publishing state changes on [/world/empty/state]
[Msg] Publishing pose messages on [/world/empty/pose/info]
[Msg] Publishing dynamic pose messages on [/world/empty/dynamic_pose/info]

Exception sending a multicast message : Network is unreachable (after a long period of running)

[Bezalelohim]

When running gz service -l while the above gz sim command runs yields no services.
No service name is output

[Bezalelohim]

@azeey Sorry for the late response.

[azeey]

It looks like you have a network configuration issue. Do you have a firewall that disables multicast messages? Can you try disabling it?

[azeey]

Any luck testing it with my suggestion above? If it is working for you, please go ahead and close the issue.

[Bezalelohim]

Yes @azeey the Ubuntu firewall was the culprit
Solution was simply
~$ sudo ufw disable
Thank You @azeey its fixed :)

[Bezalelohim]

Can I use gz sim without disabling ufw ?
Is there a fix for that ?

[azeey]

I think it's possible to allow multicast without disabling ufw. See https://docs.ros.org/en/rolling/How-To-Guides/Installation-Troubleshooting.html#enable-multicast

[vudala]

Running Gazebo Garden on a fresh Ubuntu 22.04 causes this issue.
As suggested by @azeey:

I think it's possible to allow multicast without disabling ufw. See https://docs.ros.org/en/rolling/How-To-Guides/Installation-Troubleshooting.html#enable-multicast

Doing these steps will solve the problem.