segfault in pcbnew when changing canvas

[Cirilo Bernardo]

rev: 6138

A condition relating to the Ratsnest can cause pcbnew to segfault when switching from OpenGL to default canvas.
This one is a little tricky to reproduce; what I do is:
1. select the OpenGL canvas
2. select a component with at least 3 ratsnest lines (I cannot reproduce a segfault if a component has only 2 lines)
3. hover over the component and press 'M' to move, then 'R' to rotate, then move the component a small amount
4. press ctrl-z to undo, then F9 to switch to default canvas

I'll see if I can produce a small PCB file which can reproduce the problem easily.

[Cirilo Bernardo (cirilo-bernardo)]

Something is not quite right with the ratsnest when switching between OpenGL and Default. The attached images show a case of what the screen looks like when switching from OpenGL to Default in a scenario where no segfault occurs. Some other strange behavior occurs when switching from Default to OpenGL - the ratsnest lines remain the same even though a component has moved. However, so far I can only produce a segfault switching from OpenGL to Default so these problems may be different but related issues.

To reproduce the bug using the attached PCB file:
1. switch to OpenGL
2. hover over CN1 and press 'M', then move CN1 so that the pads are just *above* the pads of CN2
3. press 'R' once to rotate then move CN1 so that the top pin is just *below* the center pin on CN2, then place the footprint
4. ctrl-z to undo
5. F9 and you should get a segfault

The segfault also occurs if I start out in Default instead of OpenGL at (1), then perform 2-3, then:
4. F11 for OpenGL (note that the original move was in Default)
5. ctrl-z to undo the move
6. F9 and segfault

For some reason I can't reproduce the fault without a Rotate operation, but this may only be a concidence.

[Cirilo Bernardo (cirilo-bernardo)]

Hi Orson,

 I still have the same problem in rev 6145.

[Maciej Suminski (orsonmmz)]

Hi CIrilo,

Apparently I had a few lucky shots and thought the problem is gone. Would you try 6147?

Regards,
Orson

[Cirilo Bernardo (cirilo-bernardo)]

Thanks Orson - I can no longer trigger the segfault and the ratsnest lines remain synchronized between OpenGL and Default canvas.