Description:
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Bug #69293 happens on 7.0.0RC4. Note it works on 7.0.0RC3
SOAP Client generates Segfault

Ubuntu 14.03 LTS 3.19.0-28-generic
configure --prefix=/usr/local/php/7.0.0RC4 --enable-libxml --enable-soap --with-openssl --with-curl=/usr

GDB
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Core was generated by `/usr/local/php/7.0.0RC4/bin/php -q ./tmp/sfdc.php'.
Program terminated with signal SIGSEGV, Segmentation fault.
#0  0x000000000052c510 in zend_string_realloc (s=0x0, len=665, persistent=0) at /home/edsradmin/software/php-7.0.0RC4/Zend/zend_string.h:185
185             if (!ZSTR_IS_INTERNED(s)) {

Test script:
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<?php
// Create Security header
$secns = "http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-wssecurity-secext-1.0.xsd";
$token = new stdClass;
$token->Username = new SOAPVar('bugs_php_net_test', XSD_STRING, null, null, null, $secns);
$token->Password = new SOAPVar('bugs_php_net_test', XSD_STRING, null, null, null, $secns);
$wsec = new stdClass;
$wsec->UsernameToken = new SoapVar($token, SOAP_ENC_OBJECT, null, null, null, $secns);
$headers = new SOAPHeader($secns, 'Security', $wsec, true);

// Go go go
$client = new SoapClient("http://www.webservicex.net/periodictable.asmx?WSDL", array('exceptions' => true, 'trace' => 1));
$client->__setSOAPHeaders($headers);
$client->GetAtomicNumber(array('ElementName' => 'Vanadium'));

Expected result:
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Expected output would be a fatal SoapFault

Fatal error: Uncaught SoapFault exception: [soap:MustUnderstand] System.Web.Services.Protocols.SoapHeaderException: SOAP header Security was not understood.

Actual result:
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Segmentation Fault (core dumped)