Program received signal SIGSEGV, Segmentation fault.
0xb750b7eb in zval_addref_p (pz=0xebfa2031) at /usr/include/php5/Zend/zend.h:381
381		return ++pz->refcount__gc;
(gdb) bt
#0  0xb750b7eb in zval_addref_p (pz=0xebfa2031) at /usr/include/php5/Zend/zend.h:381
#1  php_phongo_writeconcernerror_get_debug_info (object=0x898d53c, is_temp=0xbfffd17c) at /tmp/phongo/src/MongoDB/WriteConcernError.c:173
#2  0x0827ec63 in php_var_dump (struc=0x827f0a2, level=144340388) at /build/buildd/php5-5.3.10/ext/standard/var.c:129
#3  0x0827f0a2 in zif_var_dump (ht=144233916, return_value=0x0, return_value_ptr=0x0, this_ptr=0x0, return_value_used=-1214768127) at /build/buildd/php5-5.3.10/ext/standard/var.c:181
#4  0x083972da in zend_do_fcall_common_helper_SPEC (execute_data=0x89a7364) at /build/buildd/php5-5.3.10/Zend/zend_vm_execute.h:320
#5  0x0834668e in execute (op_array=0x831f359) at /build/buildd/php5-5.3.10/Zend/zend_vm_execute.h:107
#6  0x0831f359 in zend_execute_scripts (type=0, retval=0xbffff684, file_count=0) at /build/buildd/php5-5.3.10/Zend/zend.c:1308
#7  0x082c5a1e in php_execute_script (primary_file=0xbffff684) at /build/buildd/php5-5.3.10/main/main.c:2323
#8  0x0806b7a1 in main (argc=2, argv=0xbffff7b4) at /build/buildd/php5-5.3.10/sapi/cli/php_cli.c:1188