Description:
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This is continuation of #71492. I tried to set it to Re-Opened as instructed, but it kept saying I'm not allowed to change the bug to that state.

Hi! Sorry for late reply, got a bit occupied.
I've been monitoring the situation and the segmentation faults are not entirely gone. There is a lot less of them now though, however, they now occur at very fixed intervals: there's a series of seg faults happening after every 24 hours and ~1 second. First it's 10 seg fault errors, then 35 minutes later 11 seg fault errors and then some individual cases over the night. This all repeats every 24 hours and it always starts almost exactly at the same time.
The web service experience is better though as I no longer experience ERR_NO_RESPONSE messages during loading and I haven't heard any complaints from users either.
Unfortunately I'm no longer able to produce stacktraces, because after installing PHP7, the instructions I got from here back when I made another bug report simply do not work anymore. The first trace I posted here was generated via a dirty method (which's instructions I also got from here) by running httpd via gdb. However, the web service becomes pretty much unusable during this, because loading a simple page can take 2 minutes or even longer and I can't keep  it this way for hours.
PCRE Library version according to phpinfo(): 8.37 2015-04-28