segfault when using persistent connections

When configuring the PHP client for persistent connections, a segmentation fault is seen upon the second request for a connection within an Apache MPM environment.

The test script is as follows:

<?php

$iterations = 1;
$time_start = microtime(true);
//$cb = new Couchbase("192.168.1.200:8091"); // uses the default bucket
$cb = new Couchbase("192.168.1.200:8091", "newcachebucket", "password", "newcachebucket", true); // uses the default bucket

for ($i = 1; $i <=$iterations; $i++)

{ $cb->set("a" . $i, 1); //var_dump($cb->get("a" . $i)); $cb->get("a" . $i); }

$time_end = microtime(true);
$time = $time_end - $time_start;

echo "Did $iterations iterations in $time seconds\n";

If making a request of this script with curl, I see the following:
[root@centosb httpd]# for i in

{1..16}

; do curl http://localhost/;done
Did 1 iterations in 0.009458065032959 seconds

Did 1 iterations in 0.0088930130004883 seconds

Did 1 iterations in 0.0089321136474609 seconds

Did 1 iterations in 0.0089690685272217 seconds

Did 1 iterations in 0.0090639591217041 seconds

Did 1 iterations in 0.0095789432525635 seconds

Did 1 iterations in 0.0090429782867432 seconds

Did 1 iterations in 0.0094709396362305 seconds

curl: (52) Empty reply from server
curl: (52) Empty reply from server
curl: (52) Empty reply from server
curl: (52) Empty reply from server
curl: (52) Empty reply from server
curl: (52) Empty reply from server
curl: (52) Empty reply from server
curl: (52) Empty reply from server

The error_log shows lots of:
[Sun Jun 17 19:22:32 2012] [notice] child pid 2031 exit signal Segmentation fault (11)