BUG #16831: Idle postgres processes on Linux consumes huge amount of memory

The following bug has been logged on the website:

Bug reference:      16831
Logged by:          Yaqing Li
Email address:      yli@rsa.com
PostgreSQL version: Unsupported/Unknown
Operating system:   Suse Linux
Description:

We are still using postgresql 9.4.1, however, it looks the same issue as in
9.5 as someone reported:
https://www.postgresql.org/account/reset/NzAyMjY-5ng-2bb43dc39c9c2c644a7a/

We have some client side read only user run report against the database
using ADODB. On a 16GB system, when the memory setting for database is as
following.
    shared_buffers       = 3840MB
    effective_cache_size = 8GB
    max_connections      = 200
    work_mem             = 80MB
     maintenance_work_mem = 960MB
The memory consumption for each postgres process is like this:
    PID=11152 - Swap used: 3736 KB - (postgres)
   PID=3380 - Swap used: 1580 KB - (postgres)
   PID=11150 - Swap used: 1568 KB - (postgres)
   PID=11147 - Swap used: 1352 KB - (postgres)
    PID=3382 - Swap used: 660 KB - (postgres)

The system works fine with that,
But after we changed the system memory to 32GB, and adjusted the database
memory to the following:
   shared_buffers       = 7680MB
   effective_cache_size = 16GB
   max_connections      = 200
   work_mem             = 160MB
   maintenance_work_mem = 1920MB

The postgres process consume huge memory as following for the same database
size
   PID=6840 - Swap used: 145860 KB - (postgres)

   PID=6842 - Swap used: 142564 KB - (postgres)

    PID=6841 - Swap used: 141620 KB - (postgres)

So it looks to me there is a bug in PostgresSql about the memory allocation,
is it fixed in any version?