问题描述

本人在Manjaro下运行ROS机器人的仿真Gazebo，但是发现Gazebo无法启动GUI，而且有以下的报错：

[gzclient   -2] 
[gzclient   -2] (process:9324): Gtk-CRITICAL **: 22:09:14.280: _gtk_style_provider_private_get_settings: assertion 'GTK_IS_STYLE_PROVIDER_PRIVATE (provider)' failed
[gzclient   -2] 
[gzclient   -2] (process:9324): Gtk-CRITICAL **: 22:09:14.280: _gtk_style_provider_private_get_settings: assertion 'GTK_IS_STYLE_PROVIDER_PRIVATE (provider)' failed
[gzclient   -2] 
[gzclient   -2] (process:9324): Gtk-CRITICAL **: 22:09:14.280: _gtk_style_provider_private_get_settings: assertion 'GTK_IS_STYLE_PROVIDER_PRIVATE (provider)' failed
[ERROR] [gzclient   -2]: process has died [pid 9324, exit code -11, cmd 'gzclient   '].

Crash发生在gzclient线程下，这个问题一度卡了我好几个小时，差点就去调试Gazebo的代码了。

问题分析

首先，我们可以查看程序的调用栈：

journalctl

按shift+G到最后，可以看到：

Stack trace of thread 10463:
             #0  0x00007fab2161799b g_logv (libglib-2.0.so.0 + 0x5c99b)
             #1  0x00007fab21617c70 g_log (libglib-2.0.so.0 + 0x5cc70)
             #2  0x00007faae1cf9b53 n/a (libgtk-3.so.0 + 0x290b53)
             #3  0x00007faae1b821e0 n/a (libgtk-3.so.0 + 0x1191e0)
             #4  0x00007faae1b97074 n/a (libgtk-3.so.0 + 0x12e074)
             #5  0x00007faae1b88f55 n/a (libgtk-3.so.0 + 0x11ff55)
             #6  0x00007fab1e9f0833 g_type_create_instance (libgobject-2.0.so.0 + 0x39833)
             #7  0x00007fab1e9d82f6 n/a (libgobject-2.0.so.0 + 0x212f6)
             #8  0x00007fab1e9d932d g_object_new_with_properties (libgobject-2.0.so.0 + 0x2232d)
             #9  0x00007fab1e9d9d12 g_object_new (libgobject-2.0.so.0 + 0x22d12)
             #10 0x00007faae1d92eff n/a (libgtk-3.so.0 + 0x329eff)
             #11 0x00007fab1e9f0833 g_type_create_instance (libgobject-2.0.so.0 + 0x39833)
             #12 0x00007fab1e9d82f6 n/a (libgobject-2.0.so.0 + 0x212f6)
             #13 0x00007fab1e9d978b g_object_new_valist (libgobject-2.0.so.0 + 0x2278b)
             #14 0x00007fab1e9d9cea g_object_new (libgobject-2.0.so.0 + 0x22cea)
             #15 0x00007faaf01c0f9c _ZN22QGtk3ColorDialogHelperC1Ev (libqgnomeplatformtheme.so + 0x18f9c)
             #16 0x00007faaf01be9e7 _ZNK19QGnomePlatformTheme26createPlatformDialogHelperEN14QPlatformTheme10DialogTypeE (libqgnomeplatformtheme.so + 0x169e7)
             #17 0x00007fab24fbc7a6 _ZNK14QDialogPrivate14platformHelperEv (libQt5Widgets.so.5 + 0x3567a6)
             #18 0x00007fab24fc2b2c _ZN12QColorDialogC1ERK6QColorP7QWidget (libQt5Widgets.so.5 + 0x35cb2c)
             #19 0x00007fab26953949 _ZN6gazebo3gui21BuildingEditorPaletteC2EP7QWidget (libgazebo_gui.so.11 + 0x2a5949)
             #20 0x00007fab2694d32a _ZN6gazebo3gui14BuildingEditorC1EPNS0_10MainWindowE (libgazebo_gui.so.11 + 0x29f32a)
             #21 0x00007fab268b2ca9 _ZN6gazebo3gui10MainWindow13CreateEditorsEv (libgazebo_gui.so.11 + 0x204ca9)
             #22 0x00007fab268bed30 _ZN6gazebo3gui10MainWindowC1Ev (libgazebo_gui.so.11 + 0x210d30)
             #23 0x00007fab2687ecab _ZN6gazebo3gui4loadEv (libgazebo_gui.so.11 + 0x1d0cab)
             #24 0x00007fab2687ee6d _ZN6gazebo3gui3runEiPPc (libgazebo_gui.so.11 + 0x1d0e6d)
             #25 0x000055b61493952c n/a (gzclient-11.9.1 + 0x552c)
             #26 0x00007fab2565cb25 __libc_start_main (libc.so.6 + 0x27b25)
             #27 0x000055b6149395ee n/a (gzclient-11.9.1 + 0x55ee)

我们可以看到，出现这个问题肯定不是Gazebo的锅，错误发生在libQt5Widgets向下调用gtk过程中。
所以，我在Google上尝试搜索libQt5Widgets和GTK_IS_STYLE_PROVIDER_PRIVATE两个关键词，好家伙，这个时候发现很多Manjaro用户在网上求助相同的问题。

问题解决

参考Manjaro论坛中的帖子
删除.config下的qt5ct文件夹

rm -rf ~/.config/qt5ct

问题便解决了，我的Gazebo也成功打开了:)