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php5-fpm segfault error 6 in libpcre.so.3.13.1

Hi all,

I've a problem with a stretch/amd64 web server. Since two hours ago, I get the following in dmesg and syslog:

Jun 9 11:21:01 weber kernel: [ 331.716831] php5-fpm[1245]: segfault at 7ffcb4febf70 ip 00007f2e5e8d629a sp 00007ffcb4febf60 error 6 in libpcre.so.3.13.3[7f2e5e8c2000+72000]

which in turn results in a http 503 status code. However that happens only for one of the two VirtualHosts that make use of php5-fpm.

I've already tried lowering  pcre values in /etc/php5/fpm/php.ini:


and restarting php5-fpm (and the whole server for that matter), but nothing changed. The server has 8GB of RAM memory and

# ulimit -s

What could I do to find the cause?