diff --git a/test/known_failures_Linux.json b/test/known_failures_Linux.json
index f32fb0bcad3..8d1c5ccec7f 100644
--- a/test/known_failures_Linux.json
+++ b/test/known_failures_Linux.json
@@ -17,10 +17,14 @@
   "cl-c_glib_multi_framed-ip",
   "cl-c_glib_multi-binary_buffered-ip",
   "cl-c_glib_multi-binary_framed-ip",
+  "cl-csharp_multi_buffered-ip",
+  "cl-csharp_multi_framed-ip",
   "cl-rs_binary_buffered-ip",
   "cl-rs_binary_framed-ip",
   "cl-rs_multi_buffered-ip",
   "cl-rs_multi_framed-ip",
+  "cl-rs_multi-binary_buffered-ip",
+  "cl-rs_multi-binary_framed-ip",
   "cpp-cpp_binary_http-domain",
   "cpp-cpp_compact_http-domain",
   "cpp-cpp_compact_http-ip",