src/core/ngx_slab.c:406: error: Integer Overflow L2
  ([0, +oo] - 1):unsigned64 by call to `ngx_slab_free_locked`.

src/core/ngx_slab.c:406:5: Call
404.     ngx_shmtx_lock(&pool->mutex);
405. 
406.     ngx_slab_free_locked(pool, p);
         ^
407. 
408.     ngx_shmtx_unlock(&pool->mutex);

src/core/ngx_slab.c:412:1: <LHS trace>
410. 
411. 
412. void
     ^
413. ngx_slab_free_locked(ngx_slab_pool_t *pool, void *p)
414. {

src/core/ngx_slab.c:412:1: Global `ngx_pagesize`
  410. 
  411. 
  412. void
       ^
  413. ngx_slab_free_locked(ngx_slab_pool_t *pool, void *p)
  414. {

src/core/ngx_slab.c:491:9: Binary operation: ([0, +oo] - 1):unsigned64 by call to `ngx_slab_free_locked` 
  489.     case NGX_SLAB_EXACT:
  490. 
  491.         m = (uintptr_t) 1 <<
               ^
  492.                 (((uintptr_t) p & (ngx_pagesize - 1)) >> ngx_slab_exact_shift);
  493.         size = ngx_slab_exact_size;
