https://github.com/python/cpython/commit/a1669c95d980f6cabceaaf61e3c49873b5e03efa
commit: a1669c95d980f6cabceaaf61e3c49873b5e03efa
branch: main
author: Timofei Ivankov <[email protected]>
committer: pablogsal <[email protected]>
date: 2026-09-19T21:03:39Z
summary:
-157788: Fix python -m asyncio ps failing on long task names (#157790)
files:
A Misc/NEWS.d/next/Library/2026-09-19-14-10-18.gh-issue-157788.v70Lxd.rst
M Lib/test/test_external_inspection.py
M Modules/_remote_debugging/object_reading.c
diff --git a/Lib/test/test_external_inspection.py
b/Lib/test/test_external_inspection.py
index 910fe96d5e7d81e..1fed0f9175e8e10 100644
--- a/Lib/test/test_external_inspection.py
+++ b/Lib/test/test_external_inspection.py
@@ -1,3 +1,4 @@
+import asyncio
import unittest
import os
import textwrap
@@ -440,6 +441,22 @@ def _extract_coroutine_stacks_lineno_only(self,
stack_trace):
@requires_remote_subprocess_debugging()
class TestSelfStackTrace(RemoteInspectionTestBase):
+ @skip_if_not_supported
+ def test_long_task_name_is_truncated(self):
+ # gh-157788
+ async def main():
+ asyncio.create_task(asyncio.sleep(10_000), name="x" * 300)
+ await asyncio.sleep(0)
+ return [
+ task.task_name
+ for info in RemoteUnwinder(os.getpid()).get_all_awaited_by()
+ for task in info.awaited_by
+ ]
+
+ names = asyncio.run(main())
+ self.assertIn("Task-1", names)
+ self.assertEqual([len(n) for n in names if n.startswith("x")], [255])
+
@skip_if_not_supported
@unittest.skipIf(
sys.platform == "linux" and not PROCESS_VM_READV_SUPPORTED,
diff --git
a/Misc/NEWS.d/next/Library/2026-09-19-14-10-18.gh-issue-157788.v70Lxd.rst
b/Misc/NEWS.d/next/Library/2026-09-19-14-10-18.gh-issue-157788.v70Lxd.rst
new file mode 100644
index 000000000000000..641ca0a82a0915e
--- /dev/null
+++ b/Misc/NEWS.d/next/Library/2026-09-19-14-10-18.gh-issue-157788.v70Lxd.rst
@@ -0,0 +1,2 @@
+Fix ``python -m asyncio ps`` failing on a process that has a task with a
+name longer than 255 characters.
diff --git a/Modules/_remote_debugging/object_reading.c
b/Modules/_remote_debugging/object_reading.c
index 1cea96a2151fcc6..56d9f80a80fd0f5 100644
--- a/Modules/_remote_debugging/object_reading.c
+++ b/Modules/_remote_debugging/object_reading.c
@@ -64,12 +64,16 @@ read_py_str(
}
Py_ssize_t len = GET_MEMBER(Py_ssize_t, unicode_obj,
unwinder->debug_offsets.unicode_object.length);
- if (len < 0 || len > max_len) {
+ if (len < 0) {
PyErr_Format(PyExc_RuntimeError,
"Invalid string length (%zd) at 0x%lx", len, address);
set_exception_cause(unwinder, PyExc_RuntimeError, "Invalid string
length in remote Unicode object");
return NULL;
}
+ if (len > max_len) {
+ // gh-157788: a long name must not fail the whole read
+ len = max_len;
+ }
// Inspect state to pick the right data offset and character width.
// We rely on the remote process sharing this Python version's
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