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diff src/http/ngx_http_file_cache.c @ 4340:4533d7684e14

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Cache: only complain on long locked entries. There have been multiple reports of cases where a real locked entry was removed, resulting in a segmentation fault later in a worker which locked the entry. It looks like default inactive timeout isn't enough in real life. For now just ignore such locked entries, and move them to the top of the inactive queue to allow processing of other entries.
author Maxim Dounin <mdounin@mdounin.ru>
date Mon, 12 Dec 2011 10:49:14 +0000
parents 6f97afc238de
children 70ba81827472
line wrap: on
line diff
--- a/src/http/ngx_http_file_cache.c
+++ b/src/http/ngx_http_file_cache.c
@@ -1113,12 +1113,12 @@ ngx_http_file_cache_expire(ngx_http_file
         /*
          * abnormally exited workers may leave locked cache entries,
          * and although it may be safe to remove them completely,
-         * we prefer to remove them from inactive queue and rbtree
-         * only, and to allow other leaks
+         * we prefer to just move them to the top of the inactive queue
          */
 
         ngx_queue_remove(q);
-        ngx_rbtree_delete(&cache->sh->rbtree, &fcn->node);
+        fcn->expire = ngx_time() + cache->inactive;
+        ngx_queue_insert_head(&cache->sh->queue, &fcn->queue);
 
         ngx_log_error(NGX_LOG_ALERT, ngx_cycle->log, 0,
                       "ignore long locked inactive cache entry %*s, count:%d",