Description:
------------
Have built trunk r299837 on Mac OS X 10.6.3 machine running 
Apache 2.2.14 and PHP 5.3.1.

Get reproducable segfaults in apache upon some calls to 
fetch() when using setRSACertificate. Have loaded into a 
debug 
build of php, backtrace below.

Error from apache log:

[Thu May 27 15:30:03 2010] [notice] child pid 87030 exit 
signal Segmentation fault (11)

Similar symptom to bug #16853 but happens with both GET and 
POST, and still happens in trunk now so must be different 
cause.


Reproduce code:
---------------
// Create the oAuth connection object: we are using RSA_SHA1 signing here...
$nz = new OAuth( XERO_NZ_KEY, XERO_NZ_SECRET, OAUTH_SIG_METHOD_RSASHA1 );
$nz->setToken( XERO_NZ_KEY, XERO_NZ_SECRET );
$nz->setRSACertificate( file_get_contents( XERO_RSASHA1_PRIVATE ) );

foreach( $invoices as $data ){
$nz->fetch( API_XERO.'Invoices', $data, OAUTH_HTTP_METHOD_POST );
}

Expected result:
----------------
fetch() should return expected result, or throw an error... 
basically anything but crash apache :-)

Actual result:
--------------
#0  0x00000001012a6ad0 in zend_hash_destroy ()
#1  0x0000000101299567 in _zval_dtor_func ()
#2  0x0000000101034e9d in _zval_dtor ()
#3  0x000000010103f8dc in zif_openssl_sign ()
#4  0x000000010128e437 in zend_call_function ()
#5  0x000000010128ef3c in call_user_function_ex ()
#6  0x000000010128efae in call_user_function ()
#7  0x00000001005039ad in soo_sign ()
#8  0x0000000100509e56 in oauth_fetch ()
#9  0x000000010050ab7b in zim_oauth_fetch ()
#10 0x00000001012c1baa in zend_do_fcall_common_helper_SPEC 
()
#11 0x00000001012bdf4b in execute ()
#12 0x00000001012998ab in zend_execute_scripts ()
#13 0x00000001012423b2 in php_execute_script ()
#14 0x00000001013290c6 in php_handler ()
#15 0x00000001000012af in ap_run_handler ()
#16 0x0000000100001b8e in ap_invoke_handler ()
#17 0x000000010002f175 in ap_internal_redirect ()
#18 0x00000001003fbd02 in handler_redirect ()
#19 0x00000001000012af in ap_run_handler ()
#20 0x0000000100001b8e in ap_invoke_handler ()
#21 0x000000010002e784 in ap_process_request ()
#22 0x000000010002aff7 in ap_process_http_connection ()
#23 0x000000010001280b in ap_run_process_connection ()
#24 0x0000000100012ca5 in ap_process_connection ()
#25 0x00000001000353f2 in child_main ()
#26 0x00000001000354dc in make_child ()
#27 0x0000000100035aaf in ap_mpm_run ()
#28 0x00000001000098f5 in main ()