[Bf-blender-cvs] [6e6954ac834] blender-v2.83-release: Fix T77734: random crash when rendering animation

[Vincent Blankfield]

Commit: 6e6954ac834c69c4fdc51703125d9d0fe2931868
Author: Vincent Blankfield
Date:   Tue Jun 30 14:43:00 2020 +0200
Branches: blender-v2.83-release
https://developer.blender.org/rB6e6954ac834c69c4fdc51703125d9d0fe2931868

Fix T77734: random crash when rendering animation

Differential Revision: https://developer.blender.org/D7986

===================================================================

M	source/blender/render/intern/source/external_engine.c

===================================================================

diff --git a/source/blender/render/intern/source/external_engine.c b/source/blender/render/intern/source/external_engine.c
index 4770e98bd20..44565d1317b 100644
--- a/source/blender/render/intern/source/external_engine.c
+++ b/source/blender/render/intern/source/external_engine.c
@@ -746,9 +746,11 @@ 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);