Yes, we're trying to open the ruby.stats file twice due to the "Stats::getDumpQueue().process();" in src/base/stats/text.cc:151 that I added in the patch, see below. I'm updating the patch without these three lines. If anybody things we should do the check for any file (.gz or not) we can add these three lines again at the beginning of the method, outside the if block, just as Ali suggests.

You're right, the stats are dumped twice now. This is why in src/base/output.cc:89-91 it was needed to check that the file was not already opened. I'm updating the patch removing this line so that it only happens once, in the python path.