From 1341e18cacd526f4aca831e5ce633d02f93df5a5 Mon Sep 17 00:00:00 2001
From: Robin Gareus <robin@gareus.org>
Date: Fri, 14 Feb 2020 18:42:45 +0100
Subject: [PATCH] Fix potential deadlock (session-template with latent procs)

---
 libs/ardour/session_state.cc | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/libs/ardour/session_state.cc b/libs/ardour/session_state.cc
index 87584ce89c..73d65ba7b6 100644
--- a/libs/ardour/session_state.cc
+++ b/libs/ardour/session_state.cc
@@ -325,6 +325,9 @@ Session::post_engine_init ()
 			for (RouteList::iterator i = r->begin(); i != r->end(); ++i) {
 				(*i)->configure_processors (0);
 			}
+			/* release process-lock, ProcessorChangeBlocker may trigger
+			 * latency-callback from non-rt thread which may take the lock */
+			lx.release ();
 		}
 
 		/* Reset all panners */