[PostGIS] #5684: Segfault from _RegisterMissingFaces

[PostGIS]

#5684: Segfault from _RegisterMissingFaces
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  Reporter:  strk      |      Owner:  strk
      Type:  defect    |     Status:  new
  Priority:  blocker   |  Milestone:  PostGIS 3.5.0
 Component:  topology  |    Version:  master
Resolution:            |   Keywords:
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Comment (by strk):

 Instructions to reproduce:
 1. Download the attached issue5684.pgtopo
 2. Import with: pgtopo_import -f issue5684.pgtopo issue5684 | psql
 postgis_reg
 3. select topology._registermissingfaces('issue5684'); -- 3 times

 Here's the dance performance:
 {{{
 strk=# select topology._registermissingfaces('issue5684');
 ERROR:  Polygonize: face table is not empty.
 strk=# select topology._registermissingfaces('issue5684');
 ERROR:  Polygonize: face table is not empty.
 strk=# select topology._registermissingfaces('issue5684');
 server closed the connection unexpectedly
         This probably means the server terminated abnormally
         before or while processing the request.
 The connection to the server was lost. Attempting reset: Failed.
 The connection to the server was lost. Attempting reset: Failed.
 !?>
 }}}
-- 
Ticket URL: <https://trac.osgeo.org/postgis/ticket/5684#comment:2>
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