[postgis-tickets] [PostGIS] #3429: upgrade from 2.1.3 to 2.3.0dev enters infinite loop

[PostGIS]

#3429: upgrade from 2.1.3 to 2.3.0dev enters infinite loop
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  Reporter:  strk                   |      Owner:  strk
      Type:  defect                 |     Status:  new
  Priority:  critical               |  Milestone:  PostGIS 2.2.2
 Component:  build/upgrade/install  |    Version:  2.2.x
Resolution:                         |   Keywords:
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Comment (by Talkless):

 We had same problem on Debian Wheezy with PostgreSQL 9.4 and Postgis 2.1
 from pgdg repository.

 Package updates where installed on which new postgresql-9.4-postgis-2.2
 package was installed automatically.

 Our DBA tried to update Postgis extension, but some strange errors
 occurred, like something about changing "postgis.backed" and this infinite
 loop mentioned in bug report.

 perf top showed that postgres process is executing init_rt_allocator,
 rt_something_allocator functions from both postgis-2.1.so and
 postgis-2.2.so. Had to sigkill (sigterm, hup, int did not work). Only
 after removing Postgis 2.1 extension update was successfull.

 Problem is I do not how to reproduces it, because if I install
 postgresql-9.4-postigs-2.1, 2.2 packages is also automatically installed,
 so I get Postgis 2.2 extension by default, if I understand correctly.

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Ticket URL: <https://trac.osgeo.org/postgis/ticket/3429#comment:15>
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