[postgis-tickets] [PostGIS] #2382: Can't upgrade postgis ERROR: attempt to redefine parameter "postgis.backend"

[PostGIS]

#2382: Can't upgrade postgis ERROR: attempt to redefine parameter
"postgis.backend"
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 Reporter:  robe                   |       Owner:  robe         
     Type:  defect                 |      Status:  new          
 Priority:  medium                 |   Milestone:  PostGIS 2.2.0
Component:  build/upgrade/install  |     Version:  trunk        
 Keywords:                         |  
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Comment(by robe):

 Just tried running the rtpostgis_upgrade.sql script and that actually runs
 just dandy. No problems.  Though the gdal_path GUC is new in 2.2 so 2.1
 wouldn't have it anyway so it could have the same issue but one we won't
 see until someone tries to upgrade to 2.3 that has raster.

 The note that nicklas put in seems to suggest it's not just on upgrade.
 " The database has lived for some months and I have just updated the
 source code (svn trunk), compiled and installed.

 Now I get this message quite randomly when I run queries involving
 postgis. "

 Nicklas if you are around, how did you upgrade?  wondering if maybe you
 just had some code left pointing at old 2.1 lib and when 2.1 and 2.2 run
 is when you get that error.

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Ticket URL: <http://trac.osgeo.org/postgis/ticket/2382#comment:16>
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