LOG: munmap(0x7fff80000000) failed: Invalid argument

Howdy.

I have an Ubuntu 14.04 LTS, configured with huge pages (4x1GB, disabled
transparent) and a later kernel than what ships with 14.04.

root(at)ff2:~# uname -a
Linux ff2 3.16.7-ckt11-061515+ #1 SMP Mon Jun 15 18:47:13 CDT 2015 x86_64
x86_64 x86_64 GNU/Linux

It had postgresql-9.3 on it and I installed postgresql-9.5 via these steps:

aptitude remove -y postgresql-9.3
echo "deb http://apt.postgresql.org/pub/repos/apt/ trusty-pgdg main 9.5" >
/etc/apt/sources.list.d/postgresql.list
apt-key adv --keyserver keyserver.ubuntu.com --recv-keys 7FCC7D46ACCC4CF8
apt-get update
apt-get install -y postgresql-client-9.5 postgresql-common postgresql-9.5

At the end of the install, these were emitted to the screen:

Setting up postgresql-9.5 (9.5.4-1.pgdg14.04+2) ...
Creating new cluster 9.5/main ...
config /etc/postgresql/9.5/main
data /var/lib/postgresql/9.5/main
locale en_US.UTF-8
LOG: munmap(0x7fff80000000) failed: Invalid argument
[... snip 14 or so repeats ...]
LOG: munmap(0x7fff80000000) failed: Invalid argument
socket /var/run/postgresql
port 5433
update-alternatives: using
/usr/share/postgresql/9.5/man/man1/postmaster.1.gz to provide
/usr/share/man/man1/postmaster.1.gz (postmaster.1.gz) in auto mode
* Starting PostgreSQL 9.5 database server
[ OK ]
Processing triggers for libc-bin (2.19-0ubuntu6.6) ...

I'm able to connect and I dumped a few default relations.

Is the munmap error of concern? It remains upon rebooting / restarting the
server.

Thanks,
Chris