From 046255c40fc0d9c5a4c528eb5955792fa08df66f Mon Sep 17 00:00:00 2001
From: Victor Stinner <vstinner@python.org>
Date: Mon, 16 Mar 2020 18:18:20 +0100
Subject: [PATCH] bpo-35370: PyEval_SetTrace() logs unraisable error (GH-18977)
 (GH-19029)

If PySys_Audit() fails in PyEval_SetProfile() or PyEval_SetTrace(),
log the error as an unraisable exception.

(cherry picked from commit f6a58507820c67e8d0fb07875cd1b1d9f5e510a8)
---
 Misc/NEWS.d/next/C API/2020-03-13-16-44-23.bpo-35370.sXRA-r.rst | 2 ++
 Python/ceval.c                                                  | 2 ++
 2 files changed, 4 insertions(+)
 create mode 100644 Misc/NEWS.d/next/C API/2020-03-13-16-44-23.bpo-35370.sXRA-r.rst

diff --git a/Misc/NEWS.d/next/C API/2020-03-13-16-44-23.bpo-35370.sXRA-r.rst b/Misc/NEWS.d/next/C API/2020-03-13-16-44-23.bpo-35370.sXRA-r.rst
new file mode 100644
index 00000000000..d3f1d293b69
--- /dev/null
+++ b/Misc/NEWS.d/next/C API/2020-03-13-16-44-23.bpo-35370.sXRA-r.rst	
@@ -0,0 +1,2 @@
+If :c:func:`PySys_Audit` fails in :c:func:`PyEval_SetProfile` or
+:c:func:`PyEval_SetTrace`, log the error as an unraisable exception.
diff --git a/Python/ceval.c b/Python/ceval.c
index 5d78d5a3935..2db6e6bf8eb 100644
--- a/Python/ceval.c
+++ b/Python/ceval.c
@@ -4686,6 +4686,7 @@ void
 PyEval_SetProfile(Py_tracefunc func, PyObject *arg)
 {
     if (PySys_Audit("sys.setprofile", NULL) < 0) {
+        _PyErr_WriteUnraisableMsg("in PyEval_SetProfile", NULL);
         return;
     }
 
@@ -4707,6 +4708,7 @@ void
 PyEval_SetTrace(Py_tracefunc func, PyObject *arg)
 {
     if (PySys_Audit("sys.settrace", NULL) < 0) {
+        _PyErr_WriteUnraisableMsg("in PyEval_SetTrace", NULL);
         return;
     }