我的生产代码中有很多协程,在处理请求时卡在未知位置。我将带有Python 支持扩展的 gdb 附加到进程,但它没有显示协程中进程卡住的确切行,只显示主堆栈跟踪。这是一个最小的例子:
import asyncio
async def hello():
await asyncio.sleep(30)
print('hello world')
asyncio.run(hello())
(gdb) py-bt
Traceback (most recent call first):
File "/usr/lib/python3.8/selectors.py", line 468, in select
fd_event_list = self._selector.poll(timeout, max_ev)
File "/usr/lib/python3.8/asyncio/base_events.py", line 2335, in _run_once
File "/usr/lib/python3.8/asyncio/base_events.py", line 826, in run_forever
None, getaddr_func, host, port, family, type, proto, flags)
File "/usr/lib/python3.8/asyncio/base_events.py", line 603, in run_until_complete
self.run_forever()
File "/usr/lib/python3.8/asyncio/runners.py", line 299, in run
File "main.py", line 7, in <module>
GDB 显示了一个在第 7 行结束的跟踪,但代码显然卡在第 4 行。如何使用嵌套协程使其显示更完整的跟踪?