Test "tablespace" fails during `make installcheck` on master-replica setup

Hello.

I noticed, that `make installcheck` fails on my laptop with following
errors:

http://afiskon.ru/s/98/6f94ce2cfa_regression.out.txt
http://afiskon.ru/s/b3/d0da05597e_regression.diffs.txt

My first idea was to use `git bisect`. It turned out that this issue
reproduces on commits back from 2015 as well (older versions don't compile
on my laptop). However it reproduces rarely and with different errors:

http://afiskon.ru/s/8e/1ad2c8ed2b_regression.diffs-8c48375.txt

Here are scripts I use to compile and test PostgreSQL:

https://github.com/afiskon/pgscripts

Exact steps to reproduce are:

```
./quick-build.sh && ./install.sh && make installcheck
```

Completely removing all `configure` flags doesn't make any difference.
Issue reproduces only on master-replica setup i.e. if instead of
install.sh you run ./single-install.sh all tests pass.

I'm using Arch Linux and GCC 6.2.1.

Any ideas what can cause this issue?

--
Best regards,
Aleksander Alekseev