# https://svn.apache.org/r1855406
--- apache2.orig/modules/http2/h2_conn.c
+++ apache2/modules/http2/h2_conn.c
@@ -305,6 +305,10 @@ conn_rec *h2_slave_create(conn_rec *mast
     c->notes                  = apr_table_make(pool, 5);
     c->input_filters          = NULL;
     c->output_filters         = NULL;
+    c->keepalives             = 0;
+#if AP_MODULE_MAGIC_AT_LEAST(20180903, 1)
+    c->filter_conn_ctx        = NULL;
+#endif
     c->bucket_alloc           = apr_bucket_alloc_create(pool);
     c->data_in_input_filters  = 0;
     c->data_in_output_filters = 0;
@@ -332,16 +336,15 @@ conn_rec *h2_slave_create(conn_rec *mast
         ap_set_module_config(c->conn_config, mpm, cfg);
     }
 
-    ap_log_cerror(APLOG_MARK, APLOG_TRACE2, 0, c, 
-                  "h2_stream(%ld-%d): created slave", master->id, slave_id);
+    ap_log_cerror(APLOG_MARK, APLOG_TRACE3, 0, c, 
+                  "h2_slave(%s): created", c->log_id);
     return c;
 }
 
 void h2_slave_destroy(conn_rec *slave)
 {
-    ap_log_cerror(APLOG_MARK, APLOG_TRACE1, 0, slave,
-                  "h2_stream(%s): destroy slave", 
-                  apr_table_get(slave->notes, H2_TASK_ID_NOTE));
+    ap_log_cerror(APLOG_MARK, APLOG_TRACE3, 0, slave,
+                  "h2_slave(%s): destroy", slave->log_id);
     slave->sbh = NULL;
     apr_pool_destroy(slave->pool);
 }
@@ -365,6 +368,7 @@ apr_status_t h2_slave_run_pre_connection
         slave->keepalive = AP_CONN_CLOSE;
         return ap_run_pre_connection(slave, csd);
     }
+    ap_assert(slave->output_filters);
     return APR_SUCCESS;
 }
 
--- apache2.orig/modules/http2/h2_mplx.c
+++ apache2/modules/http2/h2_mplx.c
@@ -327,7 +327,8 @@ static int stream_destroy_iter(void *ctx
                                && !task->rst_error);
             }
             
-            if (reuse_slave && slave->keepalive == AP_CONN_KEEPALIVE) {
+            task->c = NULL;
+            if (reuse_slave) {
                 h2_beam_log(task->output.beam, m->c, APLOG_DEBUG, 
                             APLOGNO(03385) "h2_task_destroy, reuse slave");    
                 h2_task_destroy(task);
@@ -437,6 +438,8 @@ void h2_mplx_release_and_join(h2_mplx *m
     apr_status_t status;
     int i, wait_secs = 60;
 
+    ap_log_cerror(APLOG_MARK, APLOG_TRACE2, 0, m->c,
+                  "h2_mplx(%ld): start release", m->id);
     /* How to shut down a h2 connection:
      * 0. abort and tell the workers that no more tasks will come from us */
     m->aborted = 1;
@@ -977,6 +980,9 @@ static apr_status_t unschedule_slow_task
      */
     n = (m->tasks_active - m->limit_active - (int)h2_ihash_count(m->sredo));
     while (n > 0 && (stream = get_latest_repeatable_unsubmitted_stream(m))) {
+        ap_log_cerror(APLOG_MARK, APLOG_TRACE2, 0, m->c, 
+                      "h2_mplx(%s): unschedule, resetting task for redo later",
+                      stream->task->id);
         h2_task_rst(stream->task, H2_ERR_CANCEL);
         h2_ihash_add(m->sredo, stream);
         --n;
--- apache2.orig/modules/http2/h2_task.c
+++ apache2/modules/http2/h2_task.c
@@ -504,7 +504,7 @@ static int h2_task_pre_conn(conn_rec* c,
     (void)arg;
     if (h2_ctx_is_task(ctx)) {
         ap_log_cerror(APLOG_MARK, APLOG_TRACE2, 0, c,
-                      "h2_h2, pre_connection, found stream task");
+                      "h2_slave(%s), pre_connection, adding filters", c->log_id);
         ap_add_input_filter("H2_SLAVE_IN", NULL, NULL, c);
         ap_add_output_filter("H2_PARSE_H1", NULL, NULL, c);
         ap_add_output_filter("H2_SLAVE_OUT", NULL, NULL, c);
@@ -545,7 +545,6 @@ h2_task *h2_task_create(conn_rec *slave,
 void h2_task_destroy(h2_task *task)
 {
     if (task->output.beam) {
-        h2_beam_log(task->output.beam, task->c, APLOG_TRACE2, "task_destroy");
         h2_beam_destroy(task->output.beam);
         task->output.beam = NULL;
     }