src/http/ngx_http_file_cache.c:1911: error: Integer Overflow L2
  ([0, +oo] - 1):unsigned64 by call to `ngx_slab_free_locked`.

src/http/ngx_http_file_cache.c:1911:9: Call
1909.         ngx_queue_remove(q);
1910.         ngx_rbtree_delete(&cache->sh->rbtree, &fcn->node);
1911.         ngx_slab_free_locked(cache->shpool, fcn);
              ^
1912.         cache->sh->count--;
1913.     }

src/core/ngx_slab.c:451:1: <LHS trace>
449. 
450. 
451. void
     ^
452. ngx_slab_free_locked(ngx_slab_pool_t *pool, void *p)
453. {

src/core/ngx_slab.c:451:1: Global `ngx_pagesize`
  449. 
  450. 
  451. void
       ^
  452. ngx_slab_free_locked(ngx_slab_pool_t *pool, void *p)
  453. {

src/core/ngx_slab.c:482:9: Binary operation: ([0, +oo] - 1):unsigned64 by call to `ngx_slab_free_locked` 
  480.         }
  481. 
  482.         n = ((uintptr_t) p & (ngx_pagesize - 1)) >> shift;
               ^
  483.         m = (uintptr_t) 1 << (n % (sizeof(uintptr_t) * 8));
  484.         n /= sizeof(uintptr_t) * 8;
