BUG #14101: Postgres Service Crashes With Memory Error And Does Not Recover

The following bug has been logged on the website:

Bug reference: 14101
Logged by: Nathan Mascitelli
Email address: nathanmascitelli(at)geotab(dot)com
PostgreSQL version: 9.4.5
Operating system: Windows Server 2012 R2
Description:

Hello,

I am running Postgres 9.4 on Windows Server 2012. I have had postgres crash
a few times with the following error:

FATAL: could not reattach to shared memory (key=00000000000000D0,
addr=00000001405E0000): error code 1455

Looking around
(http://stackoverflow.com/questions/24614314/postgresql-8-3-7-fatal-could-not-reattach-to-shared-memory-and-warning-wor)
it looks like this error was supposed to be fixed back in 8.3.

Around the time of the crash it appears to have free RAM available.

My server specs:

OS: Windows Server 2012 x64
CPU: Intel Xeon CPU 2.30GHz (x2)
RAM: 52GB
Postgres: 9.4.5

Some settings from postgres:

shared_buffers = 512MB
effective_cache_size = 39GB
work_mem = 90MB
maintenance_work_mem = 2000MB

Can anyone suggest what might be causing the crash? If you need more info
please let me know.

Thanks,

Nathan