Log audit lock name in case of problem

Author: Marc Stern

apache2/msc_logging.c

@@ -1474,7 +1474,8 @@ void sec_audit_logger_json(modsec_rec *msr) {
         /* Unlock the mutex we used to serialise access to the audit log file. */
         rc = apr_global_mutex_unlock(msr->modsecurity->auditlog_lock);
         if (rc != APR_SUCCESS) {
-            msr_log(msr, 1, "Audit log: Failed to unlock global mutex: %s",
+            msr_log(msr, 1, "Audit log: Failed to unlock global mutex '%s': %s",
+                    apr_global_mutex_lockfile(msr->modsecurity->auditlog_lock),
                     get_apr_error(msr->mp, rc));
         }
 
@@ -2254,7 +2255,8 @@ void sec_audit_logger_native(modsec_rec *msr) {
         /* Unlock the mutex we used to serialise access to the audit log file. */
         rc = apr_global_mutex_unlock(msr->modsecurity->auditlog_lock);
         if (rc != APR_SUCCESS) {
-            msr_log(msr, 1, "Audit log: Failed to unlock global mutex: %s",
+            msr_log(msr, 1, "Audit log: Failed to unlock global mutex '%s': %s",
+                    apr_global_mutex_lockfile(msr->modsecurity->auditlog_lock),
                     get_apr_error(msr->mp, rc));
         }