On 03/02/2018 08:23 AM, Eliot Miranda wrote:

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That's strange. Can you put a breakpoint in write or exit so that gdb does stop rather than exit? Martin, if I were trying t debug this I would be trying to get the error to occur within gdb said I could poke around. I don't know any better way if solving problems like this than by first because no able to examine the exception in situ. I get that it's frustrating but there's no magic bullet. One has the keep trying until one can find out what caused the crash.

By putting a breakpoint in exit I was able to get the stack below. I hope this gives you a clue as to where to look next. Once again, what I'm doing at the point of failure is dragging the corner of the X window to resize it larger.

Great.  It's a problem in the X server, not in the VM (even if it's the VM's fault).  So any X11 experts want to weigh in on how to proceed?  I hate to say it but I would at least try restarting the X server.

I'm afraid that the problem does reproduce on a different system, configured similarly but with a slightly newer X server version (xorg-server-1.19.5-r1) that has been rebooted much more recently.

-Martin