Here’s the setup: Start the program as

fgfs  --airport=KLXV  --metar="XXXX 012345Z 00000KT 99SM CLR 15/M01 A2992" 

Let the aircraft sit on the runway. There is no need to start the engine. Use 
the "v" key to cycle through the available views. The scenery looks normal 
until you get to the last view, i.e. the "model view". Then you will see that 
most (perhaps all) of the terrain is gone. Normally this view would show the 
aircraft sitting on the runway, but what you get instead is shown in figure 2. 
Cycling through the other views shows that their terrain is now gone, too, and 
does not come back.
  http://www.av8n.com/fly/fgfs/htm/bug-list.htm#fig-erosion-day

If you do it at night, you find that the entire planet has been eaten away; the 
sun and stars are visible below the horizon, as shown in figure 3.
  http://www.av8n.com/fly/fgfs/htm/bug-list.htm#fig-erosion-night

This type of failure is 100% reproducible chez moi. The degree of failure is 
somewhat variable, in the sense that sometimes all the terrain is gone but 
sometimes scattered remnants can be seen.

Sometimes if you let the aircraft sit on the eroded terrain for a while, it 
goes through its “crash” ritual, wiggling and tumbling, which is pretty silly 
given that the engine was never started.

It is common to get segfaults. I can provide detailed logs if anybody is 
interested.

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