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diff src/http/ngx_http_file_cache.c @ 3755:76e3a93821b1

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fix race condition if during reconfiguration two cache managers try to delete old inactive entries: one of them removes a entry just locked by other manager from the queue and the rbtree as long inactive entry, causes the latter manager to segfault leaving cache mutex locked, the bug has been introduced in r3727
author Igor Sysoev <igor@sysoev.ru>
date Thu, 02 Sep 2010 14:31:47 +0000
parents 77b18d36d123
children 46938b7418c6
line wrap: on
line diff
--- a/src/http/ngx_http_file_cache.c
+++ b/src/http/ngx_http_file_cache.c
@@ -582,6 +582,7 @@ ngx_http_file_cache_exists(ngx_http_file
     fcn->uses = 1;
     fcn->count = 1;
     fcn->updating = 0;
+    fcn->deleting = 0;
 
 renew:
 
@@ -1102,6 +1103,10 @@ ngx_http_file_cache_expire(ngx_http_file
             continue;
         }
 
+        if (fcn->deleting) {
+            continue;
+        }
+
         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);
@@ -1153,6 +1158,7 @@ ngx_http_file_cache_delete(ngx_http_file
         *p = '\0';
 
         fcn->count++;
+        fcn->deleting = 1;
         ngx_shmtx_unlock(&cache->shpool->mutex);
 
         len = path->name.len + 1 + path->len + 2 * NGX_HTTP_CACHE_KEY_LEN;
@@ -1168,6 +1174,7 @@ ngx_http_file_cache_delete(ngx_http_file
 
         ngx_shmtx_lock(&cache->shpool->mutex);
         fcn->count--;
+        fcn->deleting = 0;
     }
 
     if (fcn->count == 0) {
@@ -1431,6 +1438,7 @@ ngx_http_file_cache_add(ngx_http_file_ca
         fcn->error = 0;
         fcn->exists = 1;
         fcn->updating = 0;
+        fcn->deleting = 0;
         fcn->uniq = c->uniq;
         fcn->valid_sec = c->valid_sec;
         fcn->body_start = c->body_start;