http://issues.apache.org/bugzilla/show_bug.cgi?id=36780

--- httpd-2.2.4/server/util_filter.c.oldflush

+++ httpd-2.2.4/server/util_filter.c

@@ -578,8 +578,18 @@ AP_DECLARE_NONSTD(apr_status_t) ap_filte

                                                 void *ctx)

 {

     ap_filter_t *f = ctx;

+    apr_status_t rv;

-    return ap_pass_brigade(f, bb);

+    rv = ap_pass_brigade(f, bb);

+

+    /* apr_brigade_write* require that the flush function ensures that

+     * the brigade is empty upon return; otherwise the brigade may be

+     * left with a transient bucket whose contents have fallen out of

+     * scope.  Call cleanup here unconditionally to avoid the issue in

+     * all cases. */

+    apr_brigade_cleanup(bb);

+

+    return rv;

 }

 AP_DECLARE(apr_status_t) ap_fflush(ap_filter_t *f, apr_bucket_brigade *bb)