seg fault when using mod_dbd

["dnt" <dnt@xxxxxxx>]

Hi,

I want to use mod_dbd with MySQL on a system with CentOS 6.4 (x86_64).
I can execute a select statement, but getting a row fails. Finally I get a segmentation fault.
Attached is a simple test module which leads to the error.
The log output until apr_dbd_get_row is as expected.
Line 57 writes the last line into the log before I get the seg fault.

If I disable random access in the call of apr_dbd_select the seg fault already happens in line 56 when calling apr_dbd_get_row.

Do you have an idea whats wrong?

Installed are the current packages of CentOS 6.4
httpd-2.2.15
apr-util-1.3.9
apr-util-mysql-1.3.9
mysql-5.1.69

Thanks in advance
Dominic

#include <apr-1/apr_optional.h>
#include <apr-1/apr_dbd.h>
#include <apr-1/apr_hooks.h>

#include <httpd/httpd.h>
#include <httpd/http_config.h>
#include <httpd/http_log.h>
#include <httpd/mod_dbd.h>

module AP_MODULE_DECLARE_DATA test_module;

static ap_dbd_t *(*test_dbd_acquire_fn)(request_rec *) = NULL;

static int test_post_config(apr_pool_t *pconf, apr_pool_t *plog, apr_pool_t *ptemp, server_rec *s)
{
	if (test_dbd_acquire_fn == NULL) {
		test_dbd_acquire_fn = APR_RETRIEVE_OPTIONAL_FN(ap_dbd_acquire);
		if (test_dbd_acquire_fn == NULL) {
			ap_log_error(APLOG_MARK, APLOG_ERR, 0, s,
			             "You must load mod_dbd to enable mod_test");
			return HTTP_INTERNAL_SERVER_ERROR;
		}
	}

	return OK;
}

static apr_status_t test_handler(request_rec *r)
{
	if (strcmp(r->handler, "test"))
		return DECLINED;

	ap_dbd_t *dbd = test_dbd_acquire_fn(r);
	if (dbd == NULL) {
		ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, "Failed to acquire database connection");
		return HTTP_INTERNAL_SERVER_ERROR;
	}

	char* sql = "select 1 from information_schema.tables limit 5";
	apr_dbd_results_t *res;
	int errnum = apr_dbd_select(dbd->driver, r->pool, dbd->handle, &res, sql, 1);
	if (errnum) {
		ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, "Failed to select: %s", apr_dbd_error(dbd->driver, dbd->handle, errnum));
		return HTTP_INTERNAL_SERVER_ERROR;
	}
	
	int rows = apr_dbd_num_tuples(dbd->driver, res);
	ap_log_rerror(APLOG_MARK, APLOG_WARNING, 0, r, "%d rows selected", rows);
	int cols = apr_dbd_num_cols(dbd->driver, res);
	ap_log_rerror(APLOG_MARK, APLOG_WARNING, 0, r, "%d cols selected", cols);
	
	apr_dbd_row_t *row;
	if (apr_dbd_get_row(dbd->driver, r->pool, res, &row, -1)) {
		ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, "Failed to get row");
		return HTTP_INTERNAL_SERVER_ERROR;
	}
	
	ap_log_rerror(APLOG_MARK, APLOG_WARNING, 0, r, "row fetched");
	
	return OK;
}

static void register_hooks(apr_pool_t *p)
{
	ap_hook_post_config(test_post_config, NULL, NULL, APR_HOOK_MIDDLE);
	ap_hook_handler(test_handler, NULL, NULL, APR_HOOK_FIRST);
}

module AP_MODULE_DECLARE_DATA test_module = {
	STANDARD20_MODULE_STUFF,
	NULL,
	NULL,
	NULL,
	NULL,
	NULL,
	register_hooks,
};

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