bpo-44184 has been fixed, it was unrelated. Mark fixed a bug in commit af5d497f72ceaf3f207a8aded028607c4c46a993. It seems like all issues are solved, I close the issue.

Mark: please set the version field to 3.11 for work in 3.11.


Commits:

commit b11a951f16f0603d98de24fee5c023df83ea552c
Author: Mark Shannon <mark@hotpy.org>
Date:   Fri May 21 10:57:35 2021 +0100

    bpo-44032: Move data stack to thread from FrameObject. (GH-26076)
    
    * Remove 'zombie' frames. We won't need them once we are allocating fixed-size frames.
    
    * Add co_nlocalplus field to code object to avoid recomputing size of locals + frees + cells.
    
    * Move locals, cells and freevars out of frame object into separate memory buffer.
    
    * Use per-threadstate allocated memory chunks for local variables.
    
    * Move globals and builtins from frame object to per-thread stack.
    
    * Move (slow) locals frame object to per-thread stack.
    
    * Move internal frame functions to internal header.

commit 498383c019c1209f6fecf8f64ce44fbf437191da
Author: Pablo Galindo <Pablogsal@gmail.com>
Date:   Fri May 21 19:15:39 2021 +0100

    bpo-44032: Fix downcast conversion in frameobject.c (GH-26291)

commit af5d497f72ceaf3f207a8aded028607c4c46a993
Author: Mark Shannon <mark@hotpy.org>
Date:   Mon May 24 16:22:02 2021 +0100

    bpo-44032: Delay deletion of stack chunks until thread state is deleted. (GH-26285)