nginx 0.5.7 *) Feature: the ssl_session_cache storage optimization. *) Bugfixes in the "ssl_session_cache" and "limit_zone" directives. *) Bugfix: the segmentation fault was occurred on start or while reconfiguration if the "ssl_session_cache" or "limit_zone" directives were used on 64-bit platforms. *) Bugfix: a segmentation fault occurred if the "add_before_body" or "add_after_body" directives were used and there was no "Content-Type" header line in response. *) Bugfix: the OpenSSL library was always built with the threads support. Thanks to Den Ivanov. *) Bugfix: the PCRE-6.5+ library and the icc compiler compatibility.

--- a/src/core/ngx_cycle.c
+++ b/src/core/ngx_cycle.c
@@ -373,6 +373,11 @@ ngx_init_cycle(ngx_cycle_t *old_cycle)
             goto failed;
         }
 
+        if (shm_zone[i].init == NULL) {
+            /* unused shared zone */
+            continue;
+        }
+
         shm_zone[i].shm.log = cycle->log;
 
         opart = &old_cycle->shared_memory.part;