# HG changeset patch
# User Maxim Dounin <mdounin@mdounin.ru>
# Date 1643722168 -10800
# Node ID dd718d1cef3c2ca2754a21176be3318b00be9e62
# Parent  c0a432c0301b89816ec379a7e5a754a4777008b2
Cache: fixed race in ngx_http_file_cache_forced_expire().

During configuration reload two cache managers might exist for a short
time.  If both tried to delete the same cache node, the "ignore long locked
inactive cache entry" alert appeared in logs.  Additionally,
ngx_http_file_cache_forced_expire() might be also called by worker
processes, with similar results.

Fix is to ignore cache nodes being deleted, similarly to how it is
done in ngx_http_file_cache_expire() since 3755:76e3a93821b1.  This
was somehow missed in 7002:ab199f0eb8e8, when ignoring long locked
cache entries was introduced in ngx_http_file_cache_forced_expire().

diff --git a/src/http/ngx_http_file_cache.c b/src/http/ngx_http_file_cache.c
--- a/src/http/ngx_http_file_cache.c
+++ b/src/http/ngx_http_file_cache.c
@@ -1756,6 +1756,11 @@ ngx_http_file_cache_forced_expire(ngx_ht
             break;
         }
 
+        if (fcn->deleting) {
+            wait = 1;
+            break;
+        }
+
         p = ngx_hex_dump(key, (u_char *) &fcn->node.key,
                          sizeof(ngx_rbtree_key_t));
         len = NGX_HTTP_CACHE_KEY_LEN - sizeof(ngx_rbtree_key_t);