From e93663363ea11e2baa7518498abae3073b48a8b4 Mon Sep 17 00:00:00 2001
From: Vincent Blankfield <vvv>
Date: Tue, 30 Jun 2020 14:43:00 +0200
Subject: Fix T77734: random crash when rendering animation

Differential Revision: https://developer.blender.org/D7986
---
 source/blender/render/intern/source/external_engine.c | 2 ++
 1 file changed, 2 insertions(+)

(limited to 'source/blender/render')

diff --git a/source/blender/render/intern/source/external_engine.c b/source/blender/render/intern/source/external_engine.c
index af3a6fdd384..5391775cab8 100644
--- a/source/blender/render/intern/source/external_engine.c
+++ b/source/blender/render/intern/source/external_engine.c
@@ -838,9 +838,11 @@ int RE_engine_render(Render *re, int do_all)
   engine->resolution_x = re->winx;
   engine->resolution_y = re->winy;
 
+  BLI_rw_mutex_lock(&re->partsmutex, THREAD_LOCK_WRITE);
   RE_parts_init(re);
   engine->tile_x = re->partx;
   engine->tile_y = re->party;
+  BLI_rw_mutex_unlock(&re->partsmutex);
 
   if (re->result->do_exr_tile) {
     render_result_exr_file_begin(re, engine);
-- 
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