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Misc/NEWS.d/next/Core_and_Builtins
- 2026-08-02-17-55-29.gh-issue-154937.m9IBba.rst
Modules
- _threadmodule.c

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`‎Misc/NEWS.d/next/Core_and_Builtins/2026-08-02-17-55-29.gh-issue-154937.m9IBba.rst‎`

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+3Lines changed: 3 additions & 0 deletions

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Original file line number	Diff line number	Diff line change
`@@ -0,0 +1,3 @@`
	`1`	+Fix a data race on thread handle identifiers when ``_thread._shutdown()``
	`2`	`+runs concurrently with the startup of non-daemon threads in the`
	`3`	+:term:`free-threaded build`.

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`‎Modules/_threadmodule.c‎`

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+1-1Lines changed: 1 addition & 1 deletion

Original file line number	Diff line number	Diff line change
`@@ -2361,7 +2361,7 @@ thread_shutdown(PyObject self, PyObject args)`
`2361`	`2361`	`struct llist_node *node;`
`2362`	`2362`	`llist_for_each_safe(node, &state->shutdown_handles) {`
`2363`	`2363`	`ThreadHandle *cur = llist_data(node, ThreadHandle, shutdown_node);`
`2364`		`- if (cur->ident != ident) {`
	`2364`	`+ if (ThreadHandle_ident(cur) != ident) {`
`2365`	`2365`	`ThreadHandle_incref(cur);`
`2366`	`2366`	`handle = cur;`
`2367`	`2367`	`break;`

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