BUG #13490: Segmentation fault on pg_stat_activity

The following bug has been logged on the website:

Bug reference:      13490
Logged by:          Michael Bommarito
Email address:      michael@bommaritollc.com
PostgreSQL version: 9.5alpha1
Operating system:   Ubuntu 14.04.2 LTS
Description:

Environment: Up-to-date instance running Trusty and using apt.postgresql.org
postgresql-9.5-alpha1.  Database was upgraded using pg_dump/restore.  All
other application behavior as expected.

Not sure if this is related to #13286 or #12918, but if so, still affecting
the binaries in apt.  Pretty critical to fly blind without access to this.

Crash example 1:
2015-07-07 16:42:45 UTC [26785-2] LOG:  server process (PID 11836) was
terminated by signal 11: Segmentation fault
2015-07-07 16:42:45 UTC [26785-3] DETAIL:  Failed process was running:
select * from pg_stat_activity ;

Crash example 2:
https://github.com/ankane/pghero/issues/30