diff --git a/python/taichi/core/util.py b/python/taichi/core/util.py
index 89956126503af..79ddc6531d14e 100644
--- a/python/taichi/core/util.py
+++ b/python/taichi/core/util.py
@@ -30,7 +30,7 @@ def import_ti_core(tmp_dir=None):
     global ti_core
     if get_os_name() != 'win':
         old_flags = sys.getdlopenflags()
-        sys.setdlopenflags(2)  # 2 = RTLD_NOW
+        sys.setdlopenflags(2 | 8)  # RTLD_NOW | RTLD_DEEPBIND
     else:
         pyddir = os.path.join(package_root(), 'lib')
         os.environ['PATH'] += ';' + pyddir
diff --git a/taichi/backends/opengl/opengl_api.cpp b/taichi/backends/opengl/opengl_api.cpp
index d466d1bc25ae4..1cdc0eb16648c 100644
--- a/taichi/backends/opengl/opengl_api.cpp
+++ b/taichi/backends/opengl/opengl_api.cpp
@@ -322,7 +322,7 @@ bool initialize_opengl(bool error_tolerance) {
       desc = "Unknown Error";
     if (error_tolerance) {
       // error tolerated, returning false
-      TI_TRACE("[glsl] cannot create GLFW window: error {}: {}", status, desc);
+      TI_DEBUG("[glsl] cannot create GLFW window: error {}: {}", status, desc);
       supported = std::make_optional<bool>(false);
       return false;
     }
diff --git a/taichi/ir/expr.cpp b/taichi/ir/expr.cpp
index 083b9fe6e1490..20ea0cd594fbe 100644
--- a/taichi/ir/expr.cpp
+++ b/taichi/ir/expr.cpp
@@ -179,7 +179,9 @@ Expr load(const Expr &ptr) {
 Expr ptr_if_global(const Expr &var) {
   if (var.is<GlobalVariableExpression>()) {
     // singleton global variable
-    TI_ASSERT(var.snode()->num_active_indices == 0);
+    TI_ASSERT_INFO(
+        var.snode()->num_active_indices == 0,
+        "Please always use 'x[None]' (instead of simply 'x') to access any 0-D tensor."
     return var[ExprGroup()];
   } else {
     // may be any local or global expr