From: An Long <aisk@users.noreply.github.com>
Date: Mon, 6 Jul 2026 23:36:26 +0000 (+0900)
Subject: gh-153068: Preserve cprofile enable errors (#153070)
X-Git-Url: http://git.ipfire.org/gitweb/index.cgi?a=commitdiff_plain;h=dea93ce2a203a9b3aedf091faa6610d13d2b5aea;p=thirdparty%2FPython%2Fcpython.git

gh-153068: Preserve cprofile enable errors (#153070)
---

diff --git a/Lib/test/test_profiling/test_tracing_profiler.py b/Lib/test/test_profiling/test_tracing_profiler.py
index 3668e24e073c..e9f55613b6cf 100644
--- a/Lib/test/test_profiling/test_tracing_profiler.py
+++ b/Lib/test/test_profiling/test_tracing_profiler.py
@@ -118,8 +118,9 @@ class CProfileTest(ProfileTest):
         pr = self.profilerclass()
         pr2 = self.profilerclass()
         pr.enable()
-        self.assertRaises(ValueError, pr2.enable)
-        pr.disable()
+        self.addCleanup(pr.disable)
+        msg = f"tool {sys.monitoring.PROFILER_ID} is already in use"
+        self.assertRaisesRegex(ValueError, msg, pr2.enable)
 
     def test_throw(self):
         """
diff --git a/Misc/NEWS.d/next/Library/2026-07-05-16-09-31.gh-issue-153068.huY9Jh.rst b/Misc/NEWS.d/next/Library/2026-07-05-16-09-31.gh-issue-153068.huY9Jh.rst
new file mode 100644
index 000000000000..accf6e99cd64
--- /dev/null
+++ b/Misc/NEWS.d/next/Library/2026-07-05-16-09-31.gh-issue-153068.huY9Jh.rst
@@ -0,0 +1,2 @@
+Fix :meth:`!cProfile.Profile.enable` to no longer overwrite errors from
+:mod:`sys.monitoring`.
diff --git a/Modules/_lsprof.c b/Modules/_lsprof.c
index 3d341a336ab2..4e50ca64f59a 100644
--- a/Modules/_lsprof.c
+++ b/Modules/_lsprof.c
@@ -821,7 +821,6 @@ _lsprof_Profiler_enable_impl(ProfilerObject *self, int subcalls,
                                           "use_tool_id", "is",
                                           self->tool_id, "cProfile");
     if (check == NULL) {
-        PyErr_Format(PyExc_ValueError, "Another profiling tool is already active");
         goto error;
     }
     Py_DECREF(check);