gh-150374: Fix double release of import lock in lazy import reification (#150376)

lpyu001 · web-flow · commit 5498eba545e9 · 2026-05-25T09:09:38.000Z
diff --git a/Misc/NEWS.d/next/Core_and_Builtins/2026-05-25-16-00-22.gh-issue-150374.Emu6d8.rst b/Misc/NEWS.d/next/Core_and_Builtins/2026-05-25-16-00-22.gh-issue-150374.Emu6d8.rst
@@ -0,0 +1 @@
+Fix double release of the import lock on lazy import reification errors.
diff --git a/Python/import.c b/Python/import.c
@@ -3928,7 +3928,6 @@ _PyImport_LoadLazyImportTstate(PyThreadState *tstate, PyObject *lazy_import)
         return NULL;
     }
     else if (PySet_Add(importing, lazy_import) < 0) {
-        _PyImport_ReleaseLock(interp);
         goto error;
     }
 

Original file line number	Diff line number	Diff line change
`@@ -0,0 +1 @@`
	`1`	`+Fix double release of the import lock on lazy import reification errors.`
Original file line number	Diff line number	Diff line change
`@@ -3928,7 +3928,6 @@ _PyImport_LoadLazyImportTstate(PyThreadState tstate, PyObject lazy_import)`
`3928`	`3928`	`return NULL;`
`3929`	`3929`	`}`
`3930`	`3930`	`else if (PySet_Add(importing, lazy_import) < 0) {`
`3931`		`- _PyImport_ReleaseLock(interp);`
`3932`	`3931`	`goto error;`
`3933`	`3932`	`}`
`3934`	`3933`