[postgis-tickets] [PostGIS] #4709: Backend crash with TopoGeo_addLinestring against an invalid topology (2)

[PostGIS]

#4709: Backend crash with TopoGeo_addLinestring against an invalid topology (2)
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  Reporter:  strk      |      Owner:  strk
      Type:  defect    |     Status:  new
  Priority:  blocker   |  Milestone:
 Component:  topology  |    Version:  master
Resolution:            |   Keywords:
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Comment (by strk):

 The fix seems easy, but we need to find out how it is possible to think
 more edges than available when that's not the case. Theoretically we have
 a referencial integrity in place so it should NOT be possible for an edge
 to reference non-existing edges, but maybe such constraint is verified
 only at the end of the transaction thus leaving the door open to such
 occurrence. For a test we might intentionally lift the referencial
 integrity constraint, corrupt the topolody, call the function.

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Ticket URL: <https://trac.osgeo.org/postgis/ticket/4709#comment:2>
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