`asyncio.gather()` doesn't clear await edge in graph

[deadlovelll]

Bug report

Bug description:

asyncio.gather() leaves a task as awaited by caller in the graph, but it actually not

import asyncio

async def survivor():
    await asyncio.Future()

async def boom():
    raise ValueError

async def main():
    s = asyncio.ensure_future(survivor())
    try:
        await asyncio.gather(s, boom())
    except ValueError:
        print("valueerror")
    asyncio.print_call_graph(s)
    s.cancel()

asyncio.run(main())

Expected:

❯ ./python repro.py
valueerror
* Task(name='Task-2', id=0x719b21d58b90)
  + Call stack:
  |   File '/home/timofei/Desktop/cpython/repro.py', line 4, in async survivor()

Actual:

❯ ./python repro.py
valueerror
* Task(name='Task-2', id=0x7fe4a47e0b90)
  + Call stack:
  |   File '/home/timofei/Desktop/cpython/repro.py', line 4, in async survivor()
  + Awaited by:
    * Task(name='Task-1', id=0x7fe4a47e0d70)
      + Call stack:
      |   File '/home/timofei/Desktop/cpython/repro.py', line 15, in async main()

Proposed fix: discard edges on the gather future

I have a fix ready for that

CPython versions tested on:

CPython main branch

Operating systems tested on:

Linux

Linked PRs

• gh-157213: Fix stale asyncio.gather() edges in the await graph #157214

[badrisatyam1-ctrl]

Hi @deadlovelll, I’d like to work on this issue if you’re not already planning to submit the fix. I saw that you mentioned you have a fix ready , are you planning to open a PR for it?

[deadlovelll]

Hi @deadlovelll, I’d like to work on this issue if you’re not already planning to submit the fix. I saw that you mentioned you have a fix ready , are you planning to open a PR for it?

Yes, i'm planning to push PR soon