Remove call from sibling list when it is not first child.

src/core/lib/surface/call.c

@@ -504,9 +504,9 @@ void grpc_call_destroy(grpc_call *c) {
       if (c == parent->first_child) {
         parent->first_child = NULL;
       }
-      c->sibling_prev->sibling_next = c->sibling_next;
-      c->sibling_next->sibling_prev = c->sibling_prev;
     }
+    c->sibling_prev->sibling_next = c->sibling_next;
+    c->sibling_next->sibling_prev = c->sibling_prev;
     gpr_mu_unlock(&parent->child_list_mu);
     GRPC_CALL_INTERNAL_UNREF(&exec_ctx, parent, "child");
   }

tools/run_tests/generated/tests.json

@@ -82088,6 +82088,29 @@
     ], 
     "uses_polling": false
   }, 
+  {
+    "args": [
+      "test/core/end2end/fuzzers/api_fuzzer_corpus/clusterfuzz-testcase-5965570207907840"
+    ], 
+    "ci_platforms": [
+      "linux"
+    ], 
+    "cpu_cost": 0.1, 
+    "exclude_configs": [
+      "tsan"
+    ], 
+    "exclude_iomgrs": [
+      "uv"
+    ], 
+    "flaky": false, 
+    "language": "c", 
+    "name": "api_fuzzer_one_entry", 
+    "platforms": [
+      "mac", 
+      "linux"
+    ], 
+    "uses_polling": false
+  }, 
   {
     "args": [
       "test/core/end2end/fuzzers/api_fuzzer_corpus/clusterfuzz-testcase-6520142139752448"