Tribler found a bug!

[juanmacartur]

Hi! I was using Tribler and THIS happened! 😢

Traceback (most recent call last):
  File "/opt/hostedtoolcache/Python/3.10.15/x64/lib/python3.10/asyncio/events.py", line 80, in _run
  File "/opt/hostedtoolcache/Python/3.10.15/x64/lib/python3.10/asyncio/tasks.py", line 674, in cancel
  File "/opt/hostedtoolcache/Python/3.10.15/x64/lib/python3.10/asyncio/tasks.py", line 674, in cancel
  File "/opt/hostedtoolcache/Python/3.10.15/x64/lib/python3.10/asyncio/tasks.py", line 674, in cancel
  [Previous line repeated 491 more times]
  File "/opt/hostedtoolcache/Python/3.10.15/x64/lib/python3.10/asyncio/tasks.py", line 670, in cancel
RecursionError: maximum recursion depth exceeded while calling a Python object

rE@http://127.0.0.1:35781/ui/assets/index.70dc79d9.js:80:336

[qstokkink]

Thanks for reporting! This is a very obscure bug.

[dev stuff] Apparently this happens when cancelling a gather() call, the cancel() points to this: https://github.com/python/cpython/blob/3.10/Lib/asyncio/tasks.py#L655-L681 That would mean that one of the Future s that we gather loops in on itself on cancel.

[gtubolcev]

UPD: It turned out that I had no free space on device too, just like [juanmacartur] in the comments below.
I think I've got the same bug:

Traceback (most recent call last):
  File "/opt/hostedtoolcache/Python/3.10.15/x64/lib/python3.10/asyncio/events.py", line 80, in _run
  File "/opt/hostedtoolcache/Python/3.10.15/x64/lib/python3.10/asyncio/tasks.py", line 674, in cancel
  File "/opt/hostedtoolcache/Python/3.10.15/x64/lib/python3.10/asyncio/tasks.py", line 674, in cancel
  File "/opt/hostedtoolcache/Python/3.10.15/x64/lib/python3.10/asyncio/tasks.py", line 674, in cancel
  [Previous line repeated 491 more times]
  File "/opt/hostedtoolcache/Python/3.10.15/x64/lib/python3.10/asyncio/tasks.py", line 670, in cancel
RecursionError: maximum recursion depth exceeded while calling a Python object
n_@http://127.0.0.1:46721/ui/assets/index.9844966d.js:76:336

[qstokkink]

This is a bit like finding a needle in a haystack for us. Could anyone tell me when this error occurred for them? What page were you on, or did you click something, or were you shutting down?

[juanmacartur]

I was on the download screen with two files. If it happens again I'll take a closer look. I hope the translation is understood.

[qstokkink]

Thanks for the input! I'll leave my Tribler running with two downloads on the download screen. Hopefully, I can get it to fail.

[juanmacartur]

Apparently I had run out of space on the partition where the downloads folder is located.

[egbertbouman]

Maybe we're gathering shutdown_task_manager within the TaskManager itself?

Something like:

class SomeTaskManager(TaskManager):

    def __init__(self):
        super().__init__()
        self.register_task("break_stuff", self.break_stuff, delay=1)

    async def break_stuff(self):
        await asyncio.gather(self.shutdown_task_manager())

It even seems to produce this error without explicitly calling gather (since shutdown_task_manager calls it for you).
So, just doing await self.shutdown_task_manager() within a TaskManager-registered task.

[gtubolcev]

UPD: It turned out that I had no free space on device too, just like [juanmacartur] said.

[qstokkink]

This is a pretty wild. Thanks for the input everyone! It's still not going to be easy, but I think we have a fighting chance to solve this now.