src/http/modules/ngx_http_upstream_hash_module.c:599: error: Uninitialized Value
  The value read from best_i was never initialized.

src/http/modules/ngx_http_upstream_hash_module.c:599:5: 
597. 
598.     n = best_i / (8 * sizeof(uintptr_t));
599.     m = (uintptr_t) 1 << best_i % (8 * sizeof(uintptr_t));
         ^
600. 
601.     hp->rrp.tried[n] |= m;
