AttributeError: "'NoneType' object has no attribute '_callback'" in format_info in slow_coro_detection.utils

[kozlovsky]

Here:

def format_info(handle: Handle, include_stack: bool = False, stack_cut_duration: Optional[float] = None,
                limit: Optional[int] = None, enable_profiling_tip: bool = True) -> str:
    """
    Returns the representation of a task executed by asyncio, with or without the stack.
    """
    func = handle._callback  # <-- here

It is a race condition. In SlowCoroWatchingThread.run, we have:

class SlowCoroWatchingThread(Thread):
    ...
    def run(self):
        ...
        with lock:
            handle, start_time = current.handle, current.start_time
        
        if handle is not None:
            ...
            _report_freeze(current.handle, duration, first_report=prev_reported_handle is not handle)

It looks like we should pass handle instead of current.handle to _report_freeze, as accessing the current.handle attribute here is not protected by the lock.

[sentry-for-tribler]

Sentry issue: TRIBLER-1B2

[kozlovsky]

Fixed in #7613