https://github.com/python/cpython/commit/0ba71429fa57d5b756c2fcf105c2fe31a6f7ecee
commit: 0ba71429fa57d5b756c2fcf105c2fe31a6f7ecee
branch: 3.14
author: Miss Islington (bot) <[email protected]>
committer: kumaraditya303 <[email protected]>
date: 2026-09-08T13:48:13+05:30
summary:

[3.14] gh-155504: Set the interpreter before fallible thread state 
initialization (GH-155590) (#155885)

gh-155504: Set the interpreter before fallible thread state initialization 
(GH-155590)
(cherry picked from commit 94a75f74a13a11b4025c02612c47f61dec0a7398)

Co-authored-by: Abdul Mohammad <[email protected]>

files:
A 
Misc/NEWS.d/next/Core_and_Builtins/2026-08-11-13-50-35.gh-issue-155504.PsTqZm.rst
M Python/pystate.c

diff --git 
a/Misc/NEWS.d/next/Core_and_Builtins/2026-08-11-13-50-35.gh-issue-155504.PsTqZm.rst
 
b/Misc/NEWS.d/next/Core_and_Builtins/2026-08-11-13-50-35.gh-issue-155504.PsTqZm.rst
new file mode 100644
index 000000000000000..e042bf3554e6f05
--- /dev/null
+++ 
b/Misc/NEWS.d/next/Core_and_Builtins/2026-08-11-13-50-35.gh-issue-155504.PsTqZm.rst
@@ -0,0 +1,2 @@
+Fix a crash when thread state creation fails before the thread state is fully
+initialized.
diff --git a/Python/pystate.c b/Python/pystate.c
index d1505be4acf50f2..5de6defb4bdc3ef 100644
--- a/Python/pystate.c
+++ b/Python/pystate.c
@@ -1506,6 +1506,8 @@ alloc_threadstate(PyInterpreterState *interp)
         }
         reset_threadstate(tstate);
     }
+    // Set the interpreter before any later initialization can fail.
+    tstate->base.interp = interp;
     return tstate;
 }
 

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