bpo-34970: Protect tasks weak set manipulation in asyncio.all_tasks() (GH-9837)
https://bugs.python.org/issue34970
diff --git a/Lib/asyncio/tasks.py b/Lib/asyncio/tasks.py
index 743e82b..15422da 100644
--- a/Lib/asyncio/tasks.py
+++ b/Lib/asyncio/tasks.py
@@ -42,7 +42,9 @@
"""Return a set of all tasks for the loop."""
if loop is None:
loop = events.get_running_loop()
- return {t for t in _all_tasks
+ # NB: set(_all_tasks) is required to protect
+ # from https://bugs.python.org/issue34970 bug
+ return {t for t in list(_all_tasks)
if futures._get_loop(t) is loop and not t.done()}
@@ -52,7 +54,9 @@
# method.
if loop is None:
loop = events.get_event_loop()
- return {t for t in _all_tasks if futures._get_loop(t) is loop}
+ # NB: set(_all_tasks) is required to protect
+ # from https://bugs.python.org/issue34970 bug
+ return {t for t in list(_all_tasks) if futures._get_loop(t) is loop}
def _set_task_name(task, name):
diff --git a/Misc/NEWS.d/next/Library/2018-10-13-11-14-13.bpo-34970.SrJTY7.rst b/Misc/NEWS.d/next/Library/2018-10-13-11-14-13.bpo-34970.SrJTY7.rst
new file mode 100644
index 0000000..a58b3dd
--- /dev/null
+++ b/Misc/NEWS.d/next/Library/2018-10-13-11-14-13.bpo-34970.SrJTY7.rst
@@ -0,0 +1 @@
+Protect tasks weak set manipulation in ``asyncio.all_tasks()``