From 8c3d1bf61171c848a849b40f28458b26dabd071f Mon Sep 17 00:00:00 2001
From: jitspoe <jitspoe@yahoo.com>
Date: Tue, 16 Nov 2021 22:07:29 -0500
Subject: [PATCH] Fix random multithreaded crash that happens when setting the
 audio stream on a AudioStreamRandomPitch stream.

---
 servers/audio/audio_stream.cpp | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/servers/audio/audio_stream.cpp b/servers/audio/audio_stream.cpp
index c098a97906a3..2c782e7b3901 100644
--- a/servers/audio/audio_stream.cpp
+++ b/servers/audio/audio_stream.cpp
@@ -352,12 +352,14 @@ AudioStreamPlaybackMicrophone::AudioStreamPlaybackMicrophone() {
 ////////////////////////////////
 
 void AudioStreamRandomPitch::set_audio_stream(const Ref<AudioStream> &p_audio_stream) {
+	AudioServer::get_singleton()->lock();
 	audio_stream = p_audio_stream;
 	if (audio_stream.is_valid()) {
 		for (Set<AudioStreamPlaybackRandomPitch *>::Element *E = playbacks.front(); E; E = E->next()) {
 			E->get()->playback = audio_stream->instance_playback();
 		}
 	}
+	AudioServer::get_singleton()->unlock();
 }
 
 Ref<AudioStream> AudioStreamRandomPitch::get_audio_stream() const {