# HG changeset patch
# User Ruslan Ermilov <ru@nginx.com>
# Date 1353674638 0
# Node ID 72e11139760b1f30f0ef5b5fe2a293ebcf1f0406
# Parent  0fce5bb53b2d18137da1ed260f203e55c03d00f8
Core: don't reuse shared memory zone that changed ownership (ticket #210).

nginx doesn't allow the same shared memory zone to be used for different
purposes, but failed to check this on reconfiguration.  If a shared memory
zone was used for another purpose in the new configuration, nginx attempted
to reuse it and crashed.

diff --git a/src/core/ngx_cycle.c b/src/core/ngx_cycle.c
--- a/src/core/ngx_cycle.c
+++ b/src/core/ngx_cycle.c
@@ -447,7 +447,9 @@ ngx_init_cycle(ngx_cycle_t *old_cycle)
                 continue;
             }
 
-            if (shm_zone[i].shm.size == oshm_zone[n].shm.size) {
+            if (shm_zone[i].tag == oshm_zone[n].tag
+                && shm_zone[i].shm.size == oshm_zone[n].shm.size)
+            {
                 shm_zone[i].shm.addr = oshm_zone[n].shm.addr;
 
                 if (shm_zone[i].init(&shm_zone[i], oshm_zone[n].data)