Index: channels/chan_iax2.c
===================================================================
--- channels/chan_iax2.c	(revision 128639)
+++ channels/chan_iax2.c	(working copy)
@@ -3766,11 +3766,12 @@
 	ast_mutex_unlock(&iaxsl[callno]);
 	tmp = ast_channel_alloc(1, state, i->cid_num, i->cid_name, i->accountcode, i->exten, i->context, i->amaflags, "IAX2/%s-%d", i->host, i->callno);
 	ast_mutex_lock(&iaxsl[callno]);
-	if (!iaxs[callno]) {
+	if (i != iaxs[callno]) {
+		ast_log(LOG_WARNING, "IAX2 pvt for callno %d was %s while not locked\n",
+				callno, iaxs[callno] ? "replaced" : "destroyed");
 		if (tmp) {
 			ast_channel_free(tmp);
 		}
-		ast_mutex_unlock(&iaxsl[callno]);
 		return NULL;
 	}