diff --git a/.github/workflows/suppr.txt b/.github/workflows/suppr.txt
index 2a43b31eb3..ff6bd2ef7a 100644
--- a/.github/workflows/suppr.txt
+++ b/.github/workflows/suppr.txt
@@ -3,3 +3,8 @@ leak:libpaddle_inference
 leak:xla::
 leak:mlir::
 leak:llvm::
+# Upstream issue: LeakSanitizer itself SEGVs while unwinding inside TF/MLIR/XLA
+# (ThreadRegistry::GetThreadLocked in sanitizer_thread_registry.h). Treat as CI flake.
+# This suppression matches the crashing stack rather than a real leak.
+# Note: lsan suppressions are matched as substrings on the stack trace.
+leak:ThreadRegistry::GetThreadLocked