diff --git a/src/core/channel/client_channel.c b/src/core/channel/client_channel.c
index da0fdba6435..9f993b39d64 100644
--- a/src/core/channel/client_channel.c
+++ b/src/core/channel/client_channel.c
@@ -124,6 +124,8 @@ static void on_lb_policy_state_changed_locked(
       w->chand->resolver != NULL) {
     publish_state = GRPC_CHANNEL_TRANSIENT_FAILURE;
     grpc_resolver_channel_saw_error(exec_ctx, w->chand->resolver);
+    GRPC_LB_POLICY_UNREF(exec_ctx, w->chand->lb_policy, "channel");
+    w->chand->lb_policy = NULL;
   }
   grpc_connectivity_state_set(exec_ctx, &w->chand->state_tracker, publish_state,
                               "lb_changed");
diff --git a/src/core/security/credentials.c b/src/core/security/credentials.c
index 543c75044b9..38a6710cd47 100644
--- a/src/core/security/credentials.c
+++ b/src/core/security/credentials.c
@@ -39,7 +39,7 @@
 #include "src/core/channel/channel_args.h"
 #include "src/core/channel/http_client_filter.h"
 #include "src/core/httpcli/httpcli.h"
-#include "src/core/iomgr/iomgr.h"
+#include "src/core/iomgr/executor.h"
 #include "src/core/json/json.h"
 #include "src/core/support/string.h"
 #include "src/core/surface/api_trace.h"
@@ -48,7 +48,6 @@
 #include <grpc/support/log.h>
 #include <grpc/support/string_util.h>
 #include <grpc/support/sync.h>
-#include <grpc/support/thd.h>
 #include <grpc/support/time.h>
 
 /* -- Common. -- */
@@ -792,15 +791,14 @@ static void md_only_test_destruct(grpc_call_credentials *creds) {
   grpc_credentials_md_store_unref(c->md_store);
 }
 
-static void on_simulated_token_fetch_done(void *user_data) {
+static void on_simulated_token_fetch_done(grpc_exec_ctx *exec_ctx,
+                                          void *user_data, int success) {
   grpc_credentials_metadata_request *r =
       (grpc_credentials_metadata_request *)user_data;
   grpc_md_only_test_credentials *c = (grpc_md_only_test_credentials *)r->creds;
-  grpc_exec_ctx exec_ctx = GRPC_EXEC_CTX_INIT;
-  r->cb(&exec_ctx, r->user_data, c->md_store->entries, c->md_store->num_entries,
+  r->cb(exec_ctx, r->user_data, c->md_store->entries, c->md_store->num_entries,
         GRPC_CREDENTIALS_OK);
   grpc_credentials_metadata_request_destroy(r);
-  grpc_exec_ctx_finish(&exec_ctx);
 }
 
 static void md_only_test_get_request_metadata(
@@ -810,10 +808,10 @@ static void md_only_test_get_request_metadata(
   grpc_md_only_test_credentials *c = (grpc_md_only_test_credentials *)creds;
 
   if (c->is_async) {
-    gpr_thd_id thd_id;
     grpc_credentials_metadata_request *cb_arg =
         grpc_credentials_metadata_request_create(creds, cb, user_data);
-    gpr_thd_new(&thd_id, on_simulated_token_fetch_done, cb_arg, NULL);
+    grpc_executor_enqueue(
+        grpc_closure_create(on_simulated_token_fetch_done, cb_arg), 1);
   } else {
     cb(exec_ctx, user_data, c->md_store->entries, 1, GRPC_CREDENTIALS_OK);
   }
diff --git a/test/core/end2end/tests/high_initial_seqno.c b/test/core/end2end/tests/high_initial_seqno.c
index 578fdf7b350..399b6e21837 100644
--- a/test/core/end2end/tests/high_initial_seqno.c
+++ b/test/core/end2end/tests/high_initial_seqno.c
@@ -36,13 +36,15 @@
 #include <stdio.h>
 #include <string.h>
 
-#include "src/core/support/string.h"
 #include <grpc/byte_buffer.h>
 #include <grpc/grpc.h>
 #include <grpc/support/alloc.h>
 #include <grpc/support/log.h>
+#include <grpc/support/string_util.h>
 #include <grpc/support/time.h>
 #include <grpc/support/useful.h>
+
+#include "src/core/support/string.h"
 #include "test/core/end2end/cq_verifier.h"
 
 enum { TIMEOUT = 200000 };
@@ -208,6 +210,7 @@ static void test_invoke_10_simple_requests(grpc_end2end_test_config config,
   grpc_end2end_test_fixture f;
   grpc_arg client_arg;
   grpc_channel_args client_args;
+  char *name;
 
   client_arg.type = GRPC_ARG_INTEGER;
   client_arg.key = GRPC_ARG_HTTP2_INITIAL_SEQUENCE_NUMBER;
@@ -216,13 +219,16 @@ static void test_invoke_10_simple_requests(grpc_end2end_test_config config,
   client_args.num_args = 1;
   client_args.args = &client_arg;
 
-  f = begin_test(config, "test_invoke_10_simple_requests", &client_args, NULL);
+  gpr_asprintf(&name, "test_invoke_requests first_seqno=%d",
+               initial_sequence_number);
+  f = begin_test(config, name, &client_args, NULL);
   for (i = 0; i < 10; i++) {
     simple_request_body(f);
     gpr_log(GPR_INFO, "Passed simple request %d", i);
   }
   end_test(&f);
   config.tear_down_data(&f);
+  gpr_free(name);
 }
 
 void grpc_end2end_tests(grpc_end2end_test_config config) {