[STICKY] xcb_xlib_too_much_data_requested workaround

[eean]

I was getting errors like this on startup:

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mono: xcb_io.c:736: _XRead: Assertion `!xcb_xlib_too_much_data_requested' failed.
Stacktrace:

  at <unknown> <0xffffffff>
  at (wrapper managed-to-native) System.Windows.Forms.X11Keyboard.XCreateFontSet (intptr,string,intptr&,int&,intptr) <0xffffffff>
  at System.Windows.Forms.X11Keyboard.CreateOverTheSpotXic (intptr,intptr) <0x000bb>
  at System.Windows.Forms.X11Keyboard.CreateXic (intptr,intptr) <0x000d7>
  at System.Windows.Forms.X11Keyboard.CreateXicForWindow (intptr) <0x00033>
  at System.Windows.Forms.X11Keyboard.FocusIn (intptr) <0x00097>
  at System.Windows.Forms.XplatUIX11.SetFocus (intptr) <0x000bb>
  at System.Windows.Forms.XplatUI.SetFocus (intptr) <0x0001f>
  at System.Windows.Forms.ContainerControl.SendControlFocus (System.Windows.Forms.Control) <0x00097>
  at System.Windows.Forms.Form.SetVisibleCore (bool) <0x00757>
  at System.Windows.Forms.Control.set_Visible (bool) <0x00032>
  at (wrapper remoting-invoke-with-check) System.Windows.Forms.Control.set_Visible (bool) <0xffffffff>
  at System.Windows.Forms.Application.RunLoop (bool,System.Windows.Forms.ApplicationContext) <0x00327>
  at System.Windows.Forms.Form.ShowDialog (System.Windows.Forms.IWin32Window) <0x008d7>
  at System.Windows.Forms.Form.ShowDialog () <0x0000f>
  at System.Windows.Forms.MessageBox/MessageBoxForm.RunDialog () <0x00073>
  at (wrapper remoting-invoke-with-check) System.Windows.Forms.MessageBox/MessageBoxForm.RunDialog () <0xffffffff>
  at System.Windows.Forms.MessageBox.Show (string,string) <0x0004b>
  at VirtualRadar.WinForms.SplashView.ReportProblem (string,string,bool) <0x0001f>
  at VirtualRadar.Library.Presenter.SplashPresenter.LoadStandingData () <0x001d1>
  at VirtualRadar.Library.Presenter.SplashPresenter.StartApplication () <0x000cb>
  at VirtualRadar.WinForms.SplashView.backgroundWorker_DoWork (object,System.ComponentModel.DoWorkEventArgs) <0x00047>
  at System.ComponentModel.BackgroundWorker.OnDoWork (System.ComponentModel.DoWorkEventArgs) <0x0002f>
  at System.ComponentModel.BackgroundWorker.ProcessWorker (object,System.ComponentModel.AsyncOperation,System.Threading.SendOrPostCallback) <0x000ae>
  at (wrapper runtime-invoke) <Module>.runtime_invoke_void__this___object_object_object (object,intptr,intptr,intptr) <0xffffffff>

xcb_xlib_too_much_data_requested looked like the relevant bit, so I googled around a bit and it seems to be a not-so-uncommon problem with Mono in general. The 'too-much' made me think it might be due to my CPU being too fast with too many cores and creating a race condition. And I think that was the case because pinning it to one CPU "solved" the problem:

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taskset -c 0 mono VirtualRadar.exe 

And then it just started working flawlessly. It was actually kind of confusing, I had started up Virtual Radar, went and started dump1090 and played with its web interface, and then I came back and found Virtual Radar tracking airplanes already lol.

[agw]

Thanks for that - I've taken the liberty of turning this post into a sticky and changing the title. I've a feeling that this has been reported before without any satisfactory solution, if forcing it onto a single processor does the job then that'll be handy.

[pakon]

Hey,

what was the error (the missbehavior) of VRS, when the stacktrace occur? In some cases the data feeds of some satelite stations are not shown. In this case, I've to restart the executable.

Cheers,
Pakon