diff -rup nginx-1.17.4/src/core/nginx.c nginx-1.17.4-patched/src/core/nginx.c
--- nginx-1.17.4/src/core/nginx.c	2017-12-17 00:00:38.136470108 -0800
+++ nginx-1.17.4-patched/src/core/nginx.c	2017-12-16 23:59:51.680958322 -0800
@@ -186,6 +186,7 @@ static u_char      *ngx_prefix;
 static u_char      *ngx_conf_file;
 static u_char      *ngx_conf_params;
 static char        *ngx_signal;
+ngx_pool_t         *saved_init_cycle_pool = NULL;
 
 
 static char **ngx_os_environ;
@@ -253,6 +254,8 @@ main(int argc, char *const *argv)
         return 1;
     }
 
+    saved_init_cycle_pool = init_cycle.pool;
+
     if (ngx_save_argv(&init_cycle, argc, argv) != NGX_OK) {
         return 1;
     }
diff -rup nginx-1.17.4/src/core/ngx_core.h nginx-1.17.4-patched/src/core/ngx_core.h
--- nginx-1.17.4/src/core/ngx_core.h	2017-10-10 08:22:51.000000000 -0700
+++ nginx-1.17.4-patched/src/core/ngx_core.h	2017-12-16 23:59:51.679958370 -0800
@@ -108,4 +108,6 @@ void ngx_cpuinfo(void);
 #define NGX_DISABLE_SYMLINKS_NOTOWNER   2
 #endif
 
+extern ngx_pool_t        *saved_init_cycle_pool;
+
 #endif /* _NGX_CORE_H_INCLUDED_ */
diff -rup nginx-1.17.4/src/core/ngx_cycle.c nginx-1.17.4-patched/src/core/ngx_cycle.c
--- nginx-1.17.4/src/core/ngx_cycle.c	2017-10-10 08:22:51.000000000 -0700
+++ nginx-1.17.4-patched/src/core/ngx_cycle.c	2017-12-16 23:59:51.678958419 -0800
@@ -748,6 +748,10 @@ old_shm_zone_done:
 
     if (ngx_process == NGX_PROCESS_MASTER || ngx_is_init_cycle(old_cycle)) {
 
+        if (ngx_is_init_cycle(old_cycle)) {
+            saved_init_cycle_pool = NULL;
+        }
+
         ngx_destroy_pool(old_cycle->pool);
         cycle->old_cycle = NULL;
 
diff -rup nginx-1.17.4/src/os/unix/ngx_process_cycle.c nginx-1.17.4-patched/src/os/unix/ngx_process_cycle.c
--- nginx-1.17.4/src/os/unix/ngx_process_cycle.c	2017-12-17 00:00:38.142469762 -0800
+++ nginx-1.17.4-patched/src/os/unix/ngx_process_cycle.c	2017-12-16 23:59:51.691957791 -0800
@@ -783,6 +783,11 @@ ngx_master_process_exit(ngx_cycle_t *cyc
     ngx_exit_cycle.files_n = ngx_cycle->files_n;
     ngx_cycle = &ngx_exit_cycle;
 
+    if (saved_init_cycle_pool != NULL && saved_init_cycle_pool != cycle->pool) {
+        ngx_destroy_pool(saved_init_cycle_pool);
+        saved_init_cycle_pool = NULL;
+    }
+
     ngx_destroy_pool(cycle->pool);
 
     exit(0);
