fetchKeywordsFileCoro would invoke loadKeywordsIntoLLSD as part of the coroutine. This would trigger an attempt to get a mutex which will fail in a coro. Instead post the cleanup back to the mainthread.

1 files changed, 8 insertions, 3 deletions

diff --git a/indra/newview/llsyntaxid.cpp b/indra/newview/llsyntaxid.cpp
index d9b2726992..16274f59bc 100644
--- a/indra/newview/llsyntaxid.cpp
+++ b/indra/newview/llsyntaxid.cpp
@@ -148,9 +148,14 @@ void LLSyntaxIdLSL::fetchKeywordsFileCoro(std::string url, std::string fileSpec)
 
     if (isSupportedVersion(result))
     {
-        setKeywordsXml(result);
-        cacheFile(fileSpec, result);
-        loadKeywordsIntoLLSD();
+        // Shuttle this task to the main coro/worker.
+        // loadKeywordsIntoLLSD will attempt to get a mutex which is not coro aware.
+        LLAppViewer::instance()->postToMainCoro([this, result, fileSpec]()
+            {
+                setKeywordsXml(result);
+                cacheFile(fileSpec, result);
+                loadKeywordsIntoLLSD();
+            });
     }
     else
     {