https://issues.apache.org/bugzilla/show_bug.cgi?id=45374
Summary: Shared memory error on starting httpd with mod_ldap
Product: Apache httpd-2
Version: 2.2.9
Platform: PC
OS/Version: Windows Server 2003
Status: NEW
Keywords: PatchAvailable
Severity: blocker
Priority: P4
Component: mod_ldap
AssignedTo: [email protected]
ReportedBy: [EMAIL PROTECTED]
The shared cache can be enable in httpd 2.2.8 and 2.2.9.
Steps to reproduce:
==========================================
httpd.conf:
ServerRoot "D:/Apache2"
ServerName myserver.org
PidFile run/httpd.pid
ErrorLog logs/error.log
LogLevel warn
LoadModule ldap_module modules/mod_ldap.so
LDAPSharedCacheFile logs/ldap_cache
listen 80
The server stops immediatly with those logs :
[notice] Server built: May 16 2008 18:51:09
[notice] Parent: Created child process 4844
[error] (17)File exists: LDAP cache: could not create shared memory segment
Configuration Failed
[crit] master_main: create child process failed. Exiting.
[error] (OS 6)Descripteur non valide : Parent: SetEvent for child process 0
failed
After investigation, the problem come from a fix in libapr (commit 570289, line
140 of apr/shmem/win32/shm.c)
To correct the problem you should apply the following patch :
Index: modules/ldap/util_ldap_cache.c
===================================================================
--- modules/ldap/util_ldap_cache.c (revision 666274)
+++ modules/ldap/util_ldap_cache.c (working copy)
@@ -404,6 +404,12 @@
size = APR_ALIGN_DEFAULT(st->cache_bytes);
result = apr_shm_create(&st->cache_shm, size, st->cache_file, st->pool);
+ if (result == APR_EEXIST) {
+ /* In case of existing cache file the apr_shm_create failed
returning APR_EEXIST
+ * So in this case, try to attach the existing file
+ */
+ result = apr_shm_attach(&st->cache_shm, st->cache_file, st->pool);
+ }
if (result != APR_SUCCESS) {
return result;
}
--
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