reliable varnish crash using pcre

[Jason Price]

Given the following vcl:

vcl 4.0;
import std;
backend localhost {
    .host = "127.0.0.1";
    .port = "8080";
}
sub vcl_recv {
    if (req.url ~ "^((?!_product).)*$") {
        std.log("made it");
    }
}

The following request causes the crash:

curl "
http://localhost/internal/v2/location?geocode=33.33,44.44&apiKey=hithere"

This ticket discusses the issue:
https://www.varnish-cache.org/trac/ticket/1576   It's closed, however the
remedies mentioned don't help ("-p thread_pool_stack=64k").  The ticket did
mention a request for minimal VCL to replicate.

Version is 4.0.3.  Rpm's come from EPEL.  I tried to get the repo from
varnish-cache.org to work, but they blew up on dependencies around
libpcre.so.0 (despite pcre and pcre-devel being installed).

OS is CentOS 7.1
PCRE version is pcre-8.32-14

-Jason
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