src/http/modules/ngx_http_upstream_hash_module.c:182: error: Integer Overflow L2
  ([0, +oo] - 1):unsigned64 by call to `ngx_rwlock_unlock`.

src/http/modules/ngx_http_upstream_hash_module.c:182:9: Call
180. 
181.     if (hp->tries > 20 || hp->rrp.peers->single || hp->key.len == 0) {
182.         ngx_http_upstream_rr_peers_unlock(hp->rrp.peers);
             ^
183.         return hp->get_rr_peer(pc, &hp->rrp);
184.     }

src/core/ngx_rwlock.c:89:1: <LHS trace>
87. 
88. 
89. void
    ^
90. ngx_rwlock_unlock(ngx_atomic_t *lock)
91. {

src/core/ngx_rwlock.c:89:1: Parameter `*lock`
  87. 
  88. 
  89. void
      ^
  90. ngx_rwlock_unlock(ngx_atomic_t *lock)
  91. {

src/core/ngx_rwlock.c:94:5: Assignment
  92.     ngx_atomic_uint_t  readers;
  93. 
  94.     readers = *lock;
          ^
  95. 
  96.     if (readers == NGX_RWLOCK_WLOCK) {

src/core/ngx_rwlock.c:103:13: Binary operation: ([0, +oo] - 1):unsigned64 by call to `ngx_rwlock_unlock` 
  101.     for ( ;; ) {
  102. 
  103.         if (ngx_atomic_cmp_set(lock, readers, readers - 1)) {
                   ^
  104.             return;
  105.         }
