[Mono-dev] WinForm Crash: null reference or invalid value was found [GDI+ status: InvalidParameter]

[rgclickit]

I am working on a WinForms application that gets shut down/crashes with the
exception noted below. The exception details are captured from
CurrentDomain.UnhandledException. I am running Mono 4.6.2 (Stable
4.6.2.16/ac9e222) on Ubuntu 16.04 LTS.

This is difficult to reproduce and seems to occur at random (the best kind
of problem eh?) The stack trace shows no user code is involved. This
exception always bubbles up with:

System.ArgumentException: A null reference or invalid value was found [GDI+
status: InvalidParameter]
  at System.Drawing.GDIPlus.CheckStatus (System.Drawing.Status status)
[0x0009b] in <1917aa1c39d94b1a91807b8cd9f03350>:0 
  at System.Drawing.Font.GetHeight (System.Single dpi) [0x0000f] in
<1917aa1c39d94b1a91807b8cd9f03350>:0 
  at System.Drawing.Font.GetHeight () [0x00006] in
<1917aa1c39d94b1a91807b8cd9f03350>:0 

Any ideas on how to troubleshoot this crash?

Full exception Details:
System.ArgumentException: A null reference or invalid value was found [GDI+
status: InvalidParameter]
  at System.Drawing.GDIPlus.CheckStatus (System.Drawing.Status status)
[0x0009b] in <1917aa1c39d94b1a91807b8cd9f03350>:0 
  at System.Drawing.Font.GetHeight (System.Single dpi) [0x0000f] in
<1917aa1c39d94b1a91807b8cd9f03350>:0 
  at System.Drawing.Font.GetHeight () [0x00006] in
<1917aa1c39d94b1a91807b8cd9f03350>:0 
  at System.Drawing.Font.get_Height () [0x00000] in
<1917aa1c39d94b1a91807b8cd9f03350>:0 
  at (wrapper remoting-invoke-with-check) System.Drawing.Font:get_Height ()
  at System.Windows.Forms.Label.InternalGetPreferredSize
(System.Drawing.Size proposed) [0x0001e] in
<d5b72d15d4f7424c8a1538e3f19ec2e3>:0 
  at System.Windows.Forms.Label.GetPreferredSize (System.Drawing.Size
proposedSize) [0x00000] in <d5b72d15d4f7424c8a1538e3f19ec2e3>:0 
  at System.Windows.Forms.Control.get_PreferredSize () [0x00000] in
<d5b72d15d4f7424c8a1538e3f19ec2e3>:0 
  at (wrapper remoting-invoke-with-check)
System.Windows.Forms.Control:get_PreferredSize ()
  at System.Windows.Forms.Layout.DefaultLayout.GetPreferredControlSize
(System.Windows.Forms.Control child) [0x00000] in
<d5b72d15d4f7424c8a1538e3f19ec2e3>:0 
  at System.Windows.Forms.Layout.DefaultLayout.LayoutDockedChildren
(System.Windows.Forms.Control parent, System.Windows.Forms.Control[]
controls) [0x0002b] in <d5b72d15d4f7424c8a1538e3f19ec2e3>:0 
  at System.Windows.Forms.Layout.DefaultLayout.Layout (System.Object
container, System.Windows.Forms.LayoutEventArgs args) [0x00013] in
<d5b72d15d4f7424c8a1538e3f19ec2e3>:0 
  at System.Windows.Forms.Control.OnLayout
(System.Windows.Forms.LayoutEventArgs levent) [0x0007c] in
<d5b72d15d4f7424c8a1538e3f19ec2e3>:0 
  at System.Windows.Forms.ScrollableControl.OnLayout
(System.Windows.Forms.LayoutEventArgs levent) [0x00013] in
<d5b72d15d4f7424c8a1538e3f19ec2e3>:0 
  at System.Windows.Forms.ContainerControl.OnLayout
(System.Windows.Forms.LayoutEventArgs e) [0x00000] in
<d5b72d15d4f7424c8a1538e3f19ec2e3>:0 
  at System.Windows.Forms.Form.OnLayout
(System.Windows.Forms.LayoutEventArgs levent) [0x00000] in
<d5b72d15d4f7424c8a1538e3f19ec2e3>:0 
  at System.Windows.Forms.Control.PerformLayout
(System.Windows.Forms.Control affectedControl, System.String
affectedProperty) [0x00066] in <d5b72d15d4f7424c8a1538e3f19ec2e3>:0 
  at (wrapper remoting-invoke-with-check)
System.Windows.Forms.Control:PerformLayout
(System.Windows.Forms.Control,string)
  at System.Windows.Forms.Control+ControlCollection.Remove
(System.Windows.Forms.Control value) [0x0002b] in
<d5b72d15d4f7424c8a1538e3f19ec2e3>:0 
  at System.Windows.Forms.Form+ControlCollection.Remove
(System.Windows.Forms.Control value) [0x0000c] in
<d5b72d15d4f7424c8a1538e3f19ec2e3>:0 
  at System.Windows.Forms.Form.RemoveOwnedForm (System.Windows.Forms.Form
ownedForm) [0x00000] in <d5b72d15d4f7424c8a1538e3f19ec2e3>:0 
  at (wrapper remoting-invoke-with-check)
System.Windows.Forms.Form:RemoveOwnedForm (System.Windows.Forms.Form)
  at System.Windows.Forms.Form.set_Owner (System.Windows.Forms.Form value)
[0x00017] in <d5b72d15d4f7424c8a1538e3f19ec2e3>:0 
  at System.Windows.Forms.Form.Dispose (System.Boolean disposing) [0x00049]
in <d5b72d15d4f7424c8a1538e3f19ec2e3>:0 
  at System.ComponentModel.Component.Finalize () [0x00000] in
<5071a6e4a4564e19a2eda0f53e42f9bd>:0 




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