Analysis for PHP #64635 bug stacktrace https://bugs.php.net/bug.php?id=64635

php-bug-64635-stacktrace.txt

Call:

https://github.com/php/php-src/blob/PHP-5.3.23/Zend/zend_API.c

Stack: 
zend_error (type=32, format=0x2aadd8a8f828 "Cannot load module '%s' because conflicting module '%s' is already loaded")

Code:
if (zend_hash_exists(&module_registry, lcname, name_len+1)) {
					efree(lcname);
					/* TODO: Check version relationship */
					zend_error(E_CORE_WARNING, "Cannot load module '%s' because conflicting module '%s' is already loaded", module->name, dep->name);
					return NULL;
				}

==Next call==

https://github.com/php/php-src/blob/PHP-5.3.23/Zend/zend.c#L1078

Stack: -

php_error_cb (type=32, error_filename=0x2aadd8a5f8d6 "Unknown", error_lineno=0, format=<value optimized out>, args=<value optimized out>)
Code:
case E_COMPILE_WARNING:
			/* The error may not be safe to handle in user-space */
			zend_error_cb(type, error_filename, error_lineno, format, args);
			break;
		default:
		
==Next call==

https://github.com/php/php-src/blob/PHP-5.3.23/main/main.c#L1031

Stack: 

php_log_err (log_message=0xa90fc38 "PHP Warning:  Cannot load module 'XCache' because conflicting module 'eAccelerator' is already loaded in Unknown on line 0")

Code:
			spprintf(&log_buffer, 0, "PHP %s:  %s in %s on line %d", error_type_str, buffer, error_filename, error_lineno);
			php_log_err(log_buffer TSRMLS_CC);
			efree(log_buffer);

==Next call==

https://github.com/php/php-src/blob/PHP-5.3.23/main/main.c#L610

Stack:

php_format_date (format=0x2aadd8a7cedc "d-M-Y H:i:s e", format_len=13, ts=1365708397, localtime=1)

Code:

#ifdef ZTS
			if (!php_during_module_startup()) {
				error_time_str = php_format_date("d-M-Y H:i:s e", 13, error_time, 1 TSRMLS_CC);
			} else {
				error_time_str = php_format_date("d-M-Y H:i:s e", 13, error_time, 0 TSRMLS_CC);
			}
#else
			error_time_str = php_format_date("d-M-Y H:i:s e", 13, error_time, 1 TSRMLS_CC); // HERE is the problem!!
#endif
			len = spprintf(&tmp, 0, "[%s] %s%s", error_time_str, log_message, PHP_EOL);

==Next call==

https://github.com/php/php-src/blob/PHP-5.3.23/ext/date/php_date.c#L1198

Stack:

get_timezone_info ()

Code:

if (localtime) {
		tzi = get_timezone_info(TSRMLS_C);
		t->tz_info = tzi;
		t->zone_type = TIMELIB_ZONETYPE_ID;
		timelib_unixtime2local(t, ts);
	}
	
==Next call==

https://github.com/php/php-src/blob/PHP-5.3.23/ext/date/php_date.c#L948

Stack: 

guess_timezone (tzdb=0x2aade0e9f500)

Code:

tz = guess_timezone(DATE_TIMEZONEDB TSRMLS_CC);

==Next Call==

https://github.com/php/php-src/blob/PHP-5.3.23/ext/date/php_date.c#L856

Stack:

timelib_timezone_id_is_valid (timezone=0xa3cb5f0 " \267<\n", tzdb=0x2aade0e9f500)

Code:

if (env && *env && timelib_timezone_id_is_valid(env, tzdb)) {
		return env;
	}

==Next call==
	
https://github.com/php/php-src/blob/PHP-5.3.23/ext/date/lib/parse_tz.c#L309

Stack:

inmem_seek_to_tz_position (tzf=0x7fff15df62f8, timezone=0xa3cb5f0 " \267<\n", tzdb=0x2aade0e9f500)

Code:
int timelib_timezone_id_is_valid(char *timezone, const timelib_tzdb *tzdb)
{
	const unsigned char *tzf;
	return (seek_to_tz_position(&tzf, timezone, tzdb));
}

==Next Call==

https://github.com/php/php-src/blob/PHP-5.3.23/ext/date/lib/parse_tz.c#L259

Stack:

CRASH

Code:
static int seek_to_tz_position(const unsigned char **tzf, char *timezone, const timelib_tzdb *tzdb)
{
	int left = 0, right = tzdb->index_size - 1;