Ken Jin

In https://github.com/python/cpython/pull/118450, Sam pointed out that GC can occur at any `Py_DECREF`. With deferred references, we will need to traverse the object's stacks. The main problem is that `frame->stacktop` might...

For the unfortunate few of us who develop on Windows, it would be nice to support js-slang here. Currently there are a few obstacles: 1. `.sh` scripts are part of...

gh-118926: Deferred reference counting GC changes for free threading

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This PR mainly introduces GC changes to the free threading GC to support deferred reference counting in the future. To get this to work, new stack references *must* immediately live...

Follow up to https://github.com/python/cpython/pull/121622 There's a refleak which I traced down to a bug in the freelist clearing code, but I have no clue why it's causing it (see below)....

PyThreadState_Clear, tstate_activate/_PyThreadState_Attach and drop_gil race race on TSAN

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# Bug report ### Bug description: Reproducer: Remove all suppressions from https://github.com/python/cpython/blob/main/Tools/tsan/suppressions_free_threading.txt Build and Run with TSAN https://github.com/python/cpython/issues/117657 We get races like ``` SUMMARY: ThreadSanitizer: data race /home/ken/Documents/GitHub/cpython/Python/pystate.c:1665:32 in PyThreadState_Clear...

TSAN reported race: ``` WARNING: ThreadSanitizer: data race (pid=31237) Read of size 8 at 0x7fffb9ac6148 by thread T333: #0 PyException_GetTraceback /home/ken/Documents/GitHub/cpython/Objects/exceptions.c:415:12 (python+0x27c20b) (BuildId: e8ff96bc7d1e595a25cb4534a571573eaa53d4f4) #1 _PyErr_SetObject /home/ken/Documents/GitHub/cpython/Python/errors.c:242:14 (python+0x52cf07) (BuildId: e8ff96bc7d1e595a25cb4534a571573eaa53d4f4)...

I tested this by running the repros in the issue on a TSAN build for 2-3 minutes each. No races reported. * Issue: gh-121546

gh-120321: Lock gen_send

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Adds per-object lock for gen_send to fix crashes. * Issue: gh-120321

asyncio module state should be locked with mutexes in free-threaded builds

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# Feature or enhancement ### Proposal: Please see issue title. ### Has this already been discussed elsewhere? No response given ### Links to previous discussion of this feature: _No response_...

```mermaid graph LR subgraph Legend ORANGE(Orange - In-progress) GREEN(Green - Done) end TAG(Stack references) TAG --> DEBUG(Debug information) TAG --> HEAPREF(Heap references) HEAPREF --> UNBOX TAG --> UNBOX(Unboxed integers With...