[docs 5/5] c-user: INTERNAL_ERROR_IDLE_THREAD_STACK_TOO_SMALL

[Sebastian Huber]

Document this fatal error.
---
 c-user/fatal-error/background.rst | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/c-user/fatal-error/background.rst b/c-user/fatal-error/background.rst
index 3c4212e..ef1e2e1 100644
--- a/c-user/fatal-error/background.rst
+++ b/c-user/fatal-error/background.rst
@@ -371,3 +371,10 @@ INTERNAL_ERROR_IDLE_THREAD_CREATE_FAILED (44)
     The creation of an IDLE task failed.  This fatal error may occur during
     system initialization.  It happens if a task create extension fails for an
     IDLE task.
+
+INTERNAL_ERROR_IDLE_THREAD_STACK_TOO_SMALL (45)
+    The task stack size of an IDLE task would have been less than the
+    configured minimum stack size for IDLE tasks, see
+    :ref:`CONFIGURE_IDLE_TASK_MINIMUM_STACK_SIZE <CONFIGURE_IDLE_TASK_MINIMUM_STACK_SIZE>`.
+    This fatal error may occur during system initialization.  It is an
+    application configuration error.
-- 
2.35.3