python: src/unix/core.c:930: uv__io_stop: Assertion ... | MagicStack/uvloop

uvloop version: 0.15.2, 0.15.3, 0.16.0.dev0
Python version: 3.8.10
Platform: Linux/Ubuntu 20.04
Can you reproduce the bug with PYTHONASYNCIODEBUG in env?: Yes
Does uvloop behave differently from vanilla asyncio? How?:
~~I don't know how to start starlette use vanilla asyncio.~~ I try use hypercorn to run vanilla asyncio asgi server, which has no coredump happened. And I use hypercorn with uvloop worker, the coredump happens again.

I use starlette, aiohttp HTTP client and uvicorn in production, and I found server automatically restarted when server is getting traffic increased.

Our starlette server requests third party website and return their responses. I use aiohttp as http client, sometime it uses HTTP proxy. I found that if the proxy is disabled, I won't get coredump. And I tried to provide an simple code to reproduce the core dump and I failed, can I do something to debug what is going wrong to get rid of the coredump?

Here is the error log of uvicorn server:

python: src/unix/core.c:930: uv__io_stop: Assertion `loop->watchers[w->fd] == w' failed.

[1]    107718 abort (core dumped)  PYTHONASYNCIODEBUG=1 ./run_server.sh

And I compiled uvloop with debug symbol, here are two of coredump stack

#0  __GI_raise (sig=sig@entry=6) at ../sysdeps/unix/sysv/linux/raise.c:50
#1  0x00007f4579796859 in __GI_abort () at abort.c:79
#2  0x00007f4579796729 in __assert_fail_base (fmt=0x7f457992c588 "%s%s%s:%u: %s%sAssertion `%s' failed.\n%n", assertion=0x7f4570b4e551 "loop->watchers[w->fd] == w",
    file=0x7f4570b4e380 "src/unix/core.c", line=930, function=<optimized out>) at assert.c:92
#3  0x00007f45797a7f36 in __GI___assert_fail (assertion=0x7f4570b4e551 "loop->watchers[w->fd] == w", file=0x7f4570b4e380 "src/unix/core.c", line=930,
    function=0x7f4570b4e668 <__PRETTY_FUNCTION__.9575> "uv__io_stop") at assert.c:101
#4  0x00007f4570b1cf42 in uv__io_stop (loop=0x2e3b340, w=0xba6d0b8, events=1) at src/unix/core.c:930
#5  0x00007f4570b284f3 in uv_read_stop (stream=0xba6d030) at src/unix/stream.c:1595
#6  0x00007f45709ce30f in __pyx_f_6uvloop_4loop_8UVStream__stop_reading (__pyx_v_self=0xc3cdf40) at uvloop/loop.c:95318
#7  0x00007f45709bdba3 in __pyx_pf_6uvloop_4loop_15UVBaseTransport_6_force_close (__pyx_v_self=0xc3cdf40, __pyx_v_exc=None) at uvloop/loop.c:90709
#8  0x00007f45709bd6af in __pyx_pw_6uvloop_4loop_15UVBaseTransport_7_force_close (__pyx_v_self=<uvloop.loop.TCPTransport at remote 0xc3cdf40>, __pyx_v_exc=None)
    at uvloop/loop.c:90620
#9  0x00007f4570b07fe8 in __Pyx_PyObject_CallMethO (func=<built-in method _force_close of uvloop.loop.TCPTransport object at remote 0xc3cdf40>, arg=None) at uvloop/loop.c:179161
#10 0x00007f4570b08266 in __Pyx_PyObject_CallOneArg (func=<built-in method _force_close of uvloop.loop.TCPTransport object at remote 0xc3cdf40>, arg=None)
    at uvloop/loop.c:179214
#11 0x00007f4570a83afa in __pyx_f_6uvloop_4loop_11SSLProtocol__abort (__pyx_v_self=0x7f4564935040, __pyx_v_exc=None) at uvloop/loop.c:141862
#12 0x00007f4570a7dc85 in __pyx_f_6uvloop_4loop_11SSLProtocol__start_shutdown (__pyx_v_self=0x7f4564935040, __pyx_optional_args=0x7ffc3255bb30) at uvloop/loop.c:140300
#13 0x00007f4570a5fd4b in __pyx_pf_6uvloop_4loop_21_SSLProtocolTransport_10close (__pyx_v_self=0x7f4555f900c0) at uvloop/loop.c:132514
#14 0x00007f4570a5f91c in __pyx_pw_6uvloop_4loop_21_SSLProtocolTransport_11close (__pyx_v_self=<uvloop.loop._SSLProtocolTransport at remote 0x7f4555f900c0>, unused=0x0)
    at uvloop/loop.c:132456
#15 0x00007f4570b07fe8 in __Pyx_PyObject_CallMethO (func=<built-in method close of uvloop.loop._SSLProtocolTransport object at remote 0x7f4555f900c0>, arg=0x0)
    at uvloop/loop.c:179161
#16 0x00007f4570b0812e in __Pyx_PyObject_CallNoArg (func=<built-in method close of uvloop.loop._SSLProtocolTransport object at remote 0x7f4555f900c0>) at uvloop/loop.c:179187
#17 0x00007f45708f6553 in __pyx_gb_6uvloop_4loop_4Loop_60generator4 (__pyx_generator=0x7f454eaeb400, __pyx_tstate=0x1e486e0, __pyx_sent_value=0x0) at uvloop/loop.c:39370
#18 0x00007f4570b0e084 in __Pyx_Coroutine_SendEx (self=0x7f454eaeb400, value=0x0, closing=0) at uvloop/loop.c:182028
#19 0x00007f4570b0e264 in __Pyx_Coroutine_FinishDelegation (gen=0x7f454eaeb400) at uvloop/loop.c:182095
#20 0x00007f4570b0ed26 in __Pyx__Coroutine_Throw (self=<iterable_coroutine at remote 0x7f454eaeb400>, typ=<CancelledError at remote 0x7f454df3ac40>, val=0x0, tb=0x0,
    args=(<CancelledError at remote 0x7f454df3ac40>,), close_on_genexit=1) at uvloop/loop.c:182334
#21 0x00007f4570b0ee26 in __Pyx_Coroutine_Throw (self=<iterable_coroutine at remote 0x7f454eaeb400>, args=(<CancelledError at remote 0x7f454df3ac40>,)) at uvloop/loop.c:182348
#22 0x00007f4570b0fc5e in __Pyx_CoroutineAwait_Throw (self=0x7f454f817880, args=(<CancelledError at remote 0x7f454df3ac40>,)) at uvloop/loop.c:182778
#23 0x00000000005f2d6a in cfunction_call_varargs (kwargs=<optimized out>, args=<optimized out>,
    func=<built-in method throw of coroutine_wrapper object at remote 0x7f454f817880>) at ../Include/internal/pycore_pyerrors.h:13
#24 PyCFunction_Call (func=<built-in method throw of coroutine_wrapper object at remote 0x7f454f817880>, args=<optimized out>, kwargs=<optimized out>) at ../Objects/call.c:773
#25 0x00000000005f3010 in _PyObject_MakeTpCall (callable=<built-in method throw of coroutine_wrapper object at remote 0x7f454f817880>, args=0x7ffc3255c7e0,
    nargs=<optimized out>, keywords=0x0) at ../Objects/call.c:159
#26 0x00000000005f360d in _PyObject_Vectorcall (kwnames=0x0, nargsf=1, args=0x7ffc3255c7e0,
    callable=<built-in method throw of coroutine_wrapper object at remote 0x7f454f817880>) at ../Include/cpython/abstract.h:125
#27 _PyObject_Vectorcall (kwnames=0x0, nargsf=1, args=0x7ffc3255c7e0, callable=<built-in method throw of coroutine_wrapper object at remote 0x7f454f817880>)
    at ../Include/cpython/abstract.h:115
#28 _PyObject_FastCall (nargs=1, args=0x7ffc3255c7e0, func=<built-in method throw of coroutine_wrapper object at remote 0x7f454f817880>) at ../Include/cpython/abstract.h:147
#29 object_vacall (base=<optimized out>, callable=<built-in method throw of coroutine_wrapper object at remote 0x7f454f817880>, vargs=<optimized out>) at ../Objects/call.c:1187
#30 0x00000000005f3795 in PyObject_CallFunctionObjArgs (callable=<optimized out>) at ../Objects/call.c:1260
#31 0x0000000000613539 in _gen_throw (gen=0x7f455741e340, close_on_genexit=1, typ=<optimized out>, val=<optimized out>, tb=<optimized out>) at ../Objects/genobject.c:442
#32 0x00000000006135ae in _gen_throw (gen=0x7f454cdb5040, close_on_genexit=1, typ=<optimized out>, val=<optimized out>, tb=<optimized out>) at ../Objects/genobject.c:427
#33 0x00000000006135ae in _gen_throw (gen=0x7f454cdb5a40, close_on_genexit=1, typ=<optimized out>, val=<optimized out>, tb=<optimized out>) at ../Objects/genobject.c:427
#34 0x00000000006135ae in _gen_throw (gen=0x7f454cdb56c0, close_on_genexit=1, typ=<optimized out>, val=<optimized out>, tb=<optimized out>) at ../Objects/genobject.c:427
#35 0x00000000006135ae in _gen_throw (gen=0x7f4565a70bc0, close_on_genexit=1, typ=<optimized out>, val=<optimized out>, tb=<optimized out>) at ../Objects/genobject.c:427
#36 0x00000000006135ae in _gen_throw (gen=0x7f4565a70b40, close_on_genexit=1, typ=<optimized out>, val=<optimized out>, tb=<optimized out>) at ../Objects/genobject.c:427
#37 0x00000000006135ae in _gen_throw (gen=0x7f4565a70cc0, close_on_genexit=1, typ=<optimized out>, val=<optimized out>, tb=<optimized out>) at ../Objects/genobject.c:427
#38 0x00000000006135ae in _gen_throw (gen=0x7f4565a70f40, close_on_genexit=1, typ=<optimized out>, val=<optimized out>, tb=<optimized out>) at ../Objects/genobject.c:427
#39 0x00000000006135ae in _gen_throw (gen=0x7f4565a70640, close_on_genexit=1, typ=<optimized out>, val=<optimized out>, tb=<optimized out>) at ../Objects/genobject.c:427
#40 0x00000000006135ae in _gen_throw (gen=0x7f4565a706c0, close_on_genexit=1, typ=<optimized out>, val=<optimized out>, tb=<optimized out>) at ../Objects/genobject.c:427
#41 0x00000000006135ae in _gen_throw (gen=0x7f4565a707c0, close_on_genexit=1, typ=<optimized out>, val=<optimized out>, tb=<optimized out>) at ../Objects/genobject.c:427
#42 0x00000000006135ae in _gen_throw (gen=0x7f4565a70840, close_on_genexit=1, typ=<optimized out>, val=<optimized out>, tb=<optimized out>) at ../Objects/genobject.c:427
#43 0x00000000006135ae in _gen_throw (gen=0x7f4565a70340, close_on_genexit=1, typ=<optimized out>, val=<optimized out>, tb=<optimized out>) at ../Objects/genobject.c:427
#44 0x00000000006135ae in _gen_throw (gen=0x7f454f815940, close_on_genexit=1, typ=<optimized out>, val=<optimized out>, tb=<optimized out>) at ../Objects/genobject.c:427
#45 0x00000000006135ae in _gen_throw (gen=0x7f454f8151c0, close_on_genexit=1, typ=<optimized out>, val=<optimized out>, tb=<optimized out>) at ../Objects/genobject.c:427
#46 0x00000000006135ae in _gen_throw (gen=0x7f454f815240, close_on_genexit=1, typ=<optimized out>, val=<optimized out>, tb=<optimized out>) at ../Objects/genobject.c:427
#47 0x00000000006135ae in _gen_throw (gen=0x7f454f815040, close_on_genexit=1, typ=<optimized out>, val=<optimized out>, tb=<optimized out>) at ../Objects/genobject.c:427
#48 0x00000000006135ae in _gen_throw (gen=0x7f454f815540, close_on_genexit=1, typ=<optimized out>, val=<optimized out>, tb=<optimized out>) at ../Objects/genobject.c:427
#49 0x00000000006135ae in _gen_throw (gen=0x7f454f815e40, close_on_genexit=1, typ=<optimized out>, val=<optimized out>, tb=<optimized out>) at ../Objects/genobject.c:427
#50 0x00000000006135ae in _gen_throw (gen=0x7f454f8155c0, close_on_genexit=1, typ=<optimized out>, val=<optimized out>, tb=<optimized out>) at ../Objects/genobject.c:427
#51 0x00000000006135ae in _gen_throw (gen=0x7f454f815ac0, close_on_genexit=1, typ=<optimized out>, val=<optimized out>, tb=<optimized out>) at ../Objects/genobject.c:427
#52 0x00000000006135ae in _gen_throw (gen=0x7f454f815b40, close_on_genexit=1, typ=<optimized out>, val=<optimized out>, tb=<optimized out>) at ../Objects/genobject.c:427
#53 0x00000000006135ae in _gen_throw (gen=0x7f454f8158c0, close_on_genexit=1, typ=<optimized out>, val=<optimized out>, tb=<optimized out>) at ../Objects/genobject.c:427
#54 0x00000000006135ae in _gen_throw (gen=0x7f454f815cc0, close_on_genexit=1, typ=<optimized out>, val=<optimized out>, tb=<optimized out>) at ../Objects/genobject.c:427
#55 0x00000000006135ae in _gen_throw (gen=0x7f454f815740, close_on_genexit=1, typ=<optimized out>, val=<optimized out>, tb=<optimized out>) at ../Objects/genobject.c:427
#56 0x00000000006135ae in _gen_throw (gen=0x7f454f815840, close_on_genexit=1, typ=<optimized out>, val=<optimized out>, tb=<optimized out>) at ../Objects/genobject.c:427
#57 0x00000000006135ae in _gen_throw (gen=0x7f454f815dc0, close_on_genexit=1, typ=<optimized out>, val=<optimized out>, tb=<optimized out>) at ../Objects/genobject.c:427
#58 0x00000000006135ae in _gen_throw (gen=0x7f456c1439c0, close_on_genexit=1, typ=<optimized out>, val=<optimized out>, tb=<optimized out>) at ../Objects/genobject.c:427
#59 0x000000000061362d in gen_throw (gen=0x7f456c1439c0, args=<optimized out>) at ../Objects/genobject.c:536
#60 0x0000000000505a1d in method_vectorcall_VARARGS (func=<optimized out>, args=0x7ffc3255d280, nargsf=<optimized out>, kwnames=<optimized out>) at ../Objects/descrobject.c:300
#61 0x00000000005f34b1 in _PyObject_Vectorcall (kwnames=0x0, nargsf=2, args=0x7ffc3255d280, callable=<method_descriptor at remote 0x7f45792afb30>)
    at ../Include/cpython/abstract.h:127
#62 _PyObject_FastCall (nargs=2, args=0x7ffc3255d280, func=<method_descriptor at remote 0x7f45792afb30>) at ../Include/cpython/abstract.h:147
#63 object_vacall (base=<optimized out>, callable=<method_descriptor at remote 0x7f45792afb30>, vargs=<optimized out>) at ../Objects/call.c:1187
#64 0x00000000005f3938 in _PyObject_CallMethodIdObjArgs (obj=<coroutine at remote 0x7f456c1439c0>, name=name@entry=0x7f4579174280 <PyId_throw>) at ../Objects/call.c:1245
#65 0x00007f4579169c95 in task_step_impl (exc=<CancelledError at remote 0x7f454df3ac40>, task=0x7f45566e3720) at ./Modules/_asynciomodule.c:2649
#66 task_step (task=0x7f45566e3720, exc=<optimized out>) at ./Modules/_asynciomodule.c:2934
#67 0x00007f457916a027 in task_wakeup (o=<optimized out>, task=0x7f45566e3720) at ./Modules/_asynciomodule.c:2993
#68 TaskWakeupMethWrapper_call (o=0x7f4554d9b850, args=<optimized out>, kwds=<optimized out>) at ./Modules/_asynciomodule.c:1791
#69 0x00007f4570b07d78 in __Pyx_PyObject_Call (func=<TaskWakeupMethWrapper at remote 0x7f4554d9b850>, arg=(<_asyncio.Future at remote 0x7f455741ec40>,), kw=0x0)
    at uvloop/loop.c:179099
#70 0x00007f4570952410 in __pyx_f_6uvloop_4loop_6Handle__run (__pyx_v_self=0x7f4566a399d0) at uvloop/loop.c:61745
#71 0x00007f4570887bb8 in __pyx_f_6uvloop_4loop_4Loop__on_idle (__pyx_v_self=0x2e88de0) at uvloop/loop.c:14363
#72 0x00007f4570952595 in __pyx_f_6uvloop_4loop_6Handle__run (__pyx_v_self=0x7f4570bc0b80) at uvloop/loop.c:61772
#73 0x00007f457099d5ae in __pyx_f_6uvloop_4loop_cb_idle_callback (__pyx_v_handle=0x2c18a00) at uvloop/loop.c:81786
#74 0x00007f4570b1fcfb in uv__run_idle (loop=0x2e3b340) at src/unix/loop-watcher.c:68
#75 0x00007f4570b1bdd4 in uv_run (loop=0x2e3b340, mode=UV_RUN_DEFAULT) at src/unix/core.c:378
#76 0x00007f457088b150 in __pyx_f_6uvloop_4loop_4Loop___run (__pyx_v_self=0x2e88de0, __pyx_v_mode=UV_RUN_DEFAULT) at uvloop/loop.c:15256
#77 0x00007f457088cdc7 in __pyx_f_6uvloop_4loop_4Loop__run (__pyx_v_self=0x2e88de0, __pyx_v_mode=UV_RUN_DEFAULT) at uvloop/loop.c:15677
#78 0x00007f45708c8fbe in __pyx_pf_6uvloop_4loop_4Loop_24run_forever (__pyx_v_self=0x2e88de0) at uvloop/loop.c:29012
#79 0x00007f45708c7e8f in __pyx_pw_6uvloop_4loop_4Loop_25run_forever (__pyx_v_self=<Loop at remote 0x2e88de0>, unused=0x0) at uvloop/loop.c:28820
#80 0x00007f4570b07fe8 in __Pyx_PyObject_CallMethO (func=<built-in method run_forever of Loop object at remote 0x2e88de0>, arg=0x0) at uvloop/loop.c:179161
#81 0x00007f4570b0812e in __Pyx_PyObject_CallNoArg (func=<built-in method run_forever of Loop object at remote 0x2e88de0>) at uvloop/loop.c:179187
#82 0x00007f45708cf35a in __pyx_pf_6uvloop_4loop_4Loop_44run_until_complete (__pyx_v_self=0x2e88de0, __pyx_v_future=<_asyncio.Task at remote 0x7f4570bc5400>)
    at uvloop/loop.c:30693
#83 0x00007f45708cd604 in __pyx_pw_6uvloop_4loop_4Loop_45run_until_complete (__pyx_v_self=<Loop at remote 0x2e88de0>, __pyx_v_future=<coroutine at remote 0x7f4570ba7cc0>)
    at uvloop/loop.c:30272
#84 0x0000000000504d56 in method_vectorcall_O (func=<method_descriptor at remote 0x7f457080ed10>, args=0x7f4570f22e08, nargsf=<optimized out>, kwnames=<optimized out>)
    at ../Objects/descrobject.c:416
#85 0x000000000056acb6 in _PyObject_Vectorcall (kwnames=0x0, nargsf=<optimized out>, args=0x7f4570f22e08, callable=<method_descriptor at remote 0x7f457080ed10>)
    at ../Include/cpython/abstract.h:127
#86 call_function (kwnames=0x0, oparg=<optimized out>, pp_stack=<synthetic pointer>, tstate=0x1e486e0) at ../Python/ceval.c:4963
#87 _PyEval_EvalFrameDefault (f=<optimized out>, throwflag=<optimized out>) at ../Python/ceval.c:3486
#89 _PyEval_EvalCodeWithName (_co=<optimized out>, globals=<optimized out>, locals=<optimized out>, args=<optimized out>, argcount=<optimized out>, kwnames=<optimized out>,
    kwargs=0x7f4570bbb1f0, kwcount=<optimized out>, kwstep=1, defs=0x7f457859d148, defcount=1, kwdefs=0x0, closure=0x0, name='run', qualname='Server.run')
    at ../Python/ceval.c:4298
#90 0x00000000005f5b33 in _PyFunction_Vectorcall (func=<optimized out>, stack=0x7f4570bbb1e8, nargsf=<optimized out>, kwnames=<optimized out>) at ../Objects/call.c:436
#91 0x000000000056acb6 in _PyObject_Vectorcall (kwnames=0x0, nargsf=<optimized out>, args=0x7f4570bbb1e8, callable=<function at remote 0x7f4578f6fa60>)
    at ../Include/cpython/abstract.h:127
#92 call_function (kwnames=0x0, oparg=<optimized out>, pp_stack=<synthetic pointer>, tstate=0x1e486e0) at ../Python/ceval.c:4963
#93 _PyEval_EvalFrameDefault (f=<optimized out>, throwflag=<optimized out>) at ../Python/ceval.c:3486
...
#97 0x000000000056bc9b in _PyObject_Vectorcall (kwnames=('host', 'port'), nargsf=<optimized out>, args=<optimized out>, callable=<function at remote 0x7f457859c9d0>)
    at ../Include/cpython/abstract.h:127
#98 call_function (kwnames=('host', 'port'), oparg=<optimized out>, pp_stack=<synthetic pointer>, tstate=<optimized out>) at ../Python/ceval.c:4963
#99 _PyEval_EvalFrameDefault (f=<optimized out>, throwflag=<optimized out>) at ../Python/ceval.c:3515
#100 0x0000000000568d9a in PyEval_EvalFrameEx (throwflag=0, f=Frame 0x7f457923c840, for file crawler/main.py, line 7, in <module> ()) at ../Python/ceval.c:741
#101 _PyEval_EvalCodeWithName (_co=<optimized out>, globals=<optimized out>, locals=<optimized out>, args=<optimized out>, argcount=<optimized out>, kwnames=<optimized out>,
    kwargs=0x0, kwcount=<optimized out>, kwstep=2, defs=0x0, defcount=0, kwdefs=0x0, closure=0x0, name=0x0, qualname=0x0) at ../Python/ceval.c:4298
#102 0x000000000068cdc7 in PyEval_EvalCodeEx (closure=0x0, kwdefs=0x0, defcount=0, defs=0x0, kwcount=0, kws=0x0, argcount=0, args=0x0, locals=<optimized out>,
    globals=<optimized out>, _co=<optimized out>) at ../Python/ceval.c:4327
#103 PyEval_EvalCode (co=<optimized out>, globals=<optimized out>, locals=<optimized out>) at ../Python/ceval.c:718
...
#107 0x000000000067e627 in pyrun_simple_file (flags=0x7ffc3255f368, closeit=1, filename='crawler/main.py', fp=0x1e48d70) at ../Python/pythonrun.c:439
#108 PyRun_SimpleFileExFlags (fp=0x1e48d70, filename=<optimized out>, closeit=1, flags=0x7ffc3255f368) at ../Python/pythonrun.c:472
#109 0x00000000006b6e62 in pymain_run_file (cf=0x7ffc3255f368, config=0x1e49180) at ../Modules/main.c:385
#110 pymain_run_python (exitcode=0x7ffc3255f360) at ../Modules/main.c:610
#111 Py_RunMain () at ../Modules/main.c:689
#112 0x00000000006b71ed in Py_BytesMain (argc=<optimized out>, argv=<optimized out>) at ../Modules/main.c:743
#113 0x00007f45797980b3 in __libc_start_main (main=0x4ef190 <main>, argc=2, argv=0x7ffc3255f548, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>,
    stack_end=0x7ffc3255f538) at ../csu/libc-start.c:308
#114 0x00000000005f96de in _start () at ../Include/internal/pycore_pyerrors.h:13

#0  __GI_raise (sig=sig@entry=6) at ../sysdeps/unix/sysv/linux/raise.c:50
#1  0x00007f74c0f6c859 in __GI_abort () at abort.c:79
#2  0x00007f74c0f6c729 in __assert_fail_base (fmt=0x7f74c1102588 "%s%s%s:%u: %s%sAssertion `%s' failed.\n%n",
    assertion=0x7f74b8324551 "loop->watchers[w->fd] == w", file=0x7f74b8324380 "src/unix/core.c", line=930, function=<optimized out>)
    at assert.c:92
#3  0x00007f74c0f7df36 in __GI___assert_fail (assertion=0x7f74b8324551 "loop->watchers[w->fd] == w",
    file=0x7f74b8324380 "src/unix/core.c", line=930, function=0x7f74b8324668 <__PRETTY_FUNCTION__.9575> "uv__io_stop") at assert.c:101
#4  0x00007f74b82f2f42 in uv__io_stop (loop=0x2fb4ee0, w=0x15eb7ea8, events=8199) at src/unix/core.c:930
#5  0x00007f74b82f3047 in uv__io_close (loop=0x2fb4ee0, w=0x15eb7ea8) at src/unix/core.c:943
#6  0x00007f74b82fe5ee in uv__stream_close (handle=0x15eb7e20) at src/unix/stream.c:1658
#7  0x00007f74b82ff61c in uv__tcp_close (handle=0x15eb7e20) at src/unix/tcp.c:460
#8  0x00007f74b82f1772 in uv_close (handle=0x15eb7e20, close_cb=0x7f74b816afa2 <__pyx_f_6uvloop_4loop___uv_close_handle_cb>)
    at src/unix/core.c:124
#9  0x00007f74b816310b in __pyx_f_6uvloop_4loop_8UVHandle__close (__pyx_v_self=0x18987580) at uvloop/loop.c:77393
#10 0x00007f74b81665b5 in __pyx_f_6uvloop_4loop_14UVSocketHandle__close (__pyx_v_self=0x18987580) at uvloop/loop.c:78354
#11 0x00007f74b81aed95 in __pyx_f_6uvloop_4loop_8UVStream__close (__pyx_v_self=0x18987580) at uvloop/loop.c:97796
#12 0x00007f74b818f816 in __pyx_f_6uvloop_4loop_15UVBaseTransport__call_connection_lost (__pyx_v_self=0x18987580,
    __pyx_v_exc=OSError(9, 'Bad file descriptor')) at uvloop/loop.c:89384
#13 0x00007f74b8128743 in __pyx_f_6uvloop_4loop_6Handle__run (__pyx_v_self=0x7f749df0e4c0) at uvloop/loop.c:61799
#14 0x00007f74b805dbb8 in __pyx_f_6uvloop_4loop_4Loop__on_idle (__pyx_v_self=0x3002890) at uvloop/loop.c:14363
#15 0x00007f74b8128595 in __pyx_f_6uvloop_4loop_6Handle__run (__pyx_v_self=0x7f74b8398af0) at uvloop/loop.c:61772
#16 0x00007f74b81735ae in __pyx_f_6uvloop_4loop_cb_idle_callback (__pyx_v_handle=0x2d8ed80) at uvloop/loop.c:81786
#17 0x00007f74b82f5cfb in uv__run_idle (loop=0x2fb4ee0) at src/unix/loop-watcher.c:68
#18 0x00007f74b82f1dd4 in uv_run (loop=0x2fb4ee0, mode=UV_RUN_DEFAULT) at src/unix/core.c:378
#19 0x00007f74b8061150 in __pyx_f_6uvloop_4loop_4Loop___run (__pyx_v_self=0x3002890, __pyx_v_mode=UV_RUN_DEFAULT) at uvloop/loop.c:15256
#20 0x00007f74b8062dc7 in __pyx_f_6uvloop_4loop_4Loop__run (__pyx_v_self=0x3002890, __pyx_v_mode=UV_RUN_DEFAULT) at uvloop/loop.c:15677
#21 0x00007f74b809efbe in __pyx_pf_6uvloop_4loop_4Loop_24run_forever (__pyx_v_self=0x3002890) at uvloop/loop.c:29012
#22 0x00007f74b809de8f in __pyx_pw_6uvloop_4loop_4Loop_25run_forever (__pyx_v_self=<Loop at remote 0x3002890>, unused=0x0)
    at uvloop/loop.c:28820
#23 0x00007f74b82ddfe8 in __Pyx_PyObject_CallMethO (func=<built-in method run_forever of Loop object at remote 0x3002890>, arg=0x0)
    at uvloop/loop.c:179161
#24 0x00007f74b82de12e in __Pyx_PyObject_CallNoArg (func=<built-in method run_forever of Loop object at remote 0x3002890>)
    at uvloop/loop.c:179187
#25 0x00007f74b80a535a in __pyx_pf_6uvloop_4loop_4Loop_44run_until_complete (__pyx_v_self=0x3002890,
    __pyx_v_future=<_asyncio.Task at remote 0x7f74b839c400>) at uvloop/loop.c:30693
#26 0x00007f74b80a3604 in __pyx_pw_6uvloop_4loop_4Loop_45run_until_complete (__pyx_v_self=<Loop at remote 0x3002890>, __pyx_v_future=<coroutine at remote 0x7f74b837ddc0>) at uvloop/loop.c:30272
#27 0x0000000000504d56 in method_vectorcall_O (func=<method_descriptor at remote 0x7f74b7fe5d10>, args=0x7f74b86fde08,
    nargsf=<optimized out>, kwnames=<optimized out>) at ../Objects/descrobject.c:416
#28 0x000000000056acb6 in _PyObject_Vectorcall (kwnames=0x0, nargsf=<optimized out>, args=0x7f74b86fde08,
    callable=<method_descriptor at remote 0x7f74b7fe5d10>) at ../Include/cpython/abstract.h:127
#29 call_function (kwnames=0x0, oparg=<optimized out>, pp_stack=<synthetic pointer>, tstate=0x1fc06e0) at ../Python/ceval.c:4963
#30 _PyEval_EvalFrameDefault (f=<optimized out>, throwflag=<optimized out>) at ../Python/ceval.c:3486

#31 0x0000000000568d9a in PyEval_EvalFrameEx (throwflag=0,
    f=Frame 0x7f74b86fdc80, for file /home/alvie/code/aftership/xxx/.venv/lib/python3.8/site-packages/uvicorn/server.py, line 49, in run (self=<Server(config=<Config(app=<Starlette(_debug=True, state=<State(_state={'engine': <CrawlerEngine(_connector_lock=<Lock(_waiters=None, _locked=False, _loop=<Loop at remote 0x3002890>) at remote 0x7f74b7b0a880>, _loader=...) at ../Python/ceval.c:741
#32 _PyEval_EvalCodeWithName (_co=<optimized out>, globals=<optimized out>, locals=<optimized out>, args=<optimized out>,
    argcount=<optimized out>, kwnames=<optimized out>, kwargs=0x7f74b83923d0, kwcount=<optimized out>, kwstep=1, defs=0x7f74bfd74148,
    defcount=1, kwdefs=0x0, closure=0x0, name='run', qualname='Server.run') at ../Python/ceval.c:4298
#33 0x00000000005f5b33 in _PyFunction_Vectorcall (func=<optimized out>, stack=0x7f74b83923c8, nargsf=<optimized out>,
    kwnames=<optimized out>) at ../Objects/call.c:436
#34 0x000000000056acb6 in _PyObject_Vectorcall (kwnames=0x0, nargsf=<optimized out>, args=0x7f74b83923c8,
    callable=<function at remote 0x7f74c0745a60>) at ../Include/cpython/abstract.h:127
#35 call_function (kwnames=0x0, oparg=<optimized out>, pp_stack=<synthetic pointer>, tstate=0x1fc06e0) at ../Python/ceval.c:4963
#36 _PyEval_EvalFrameDefault (f=<optimized out>, throwflag=<optimized out>) at ../Python/ceval.c:3486
#37 0x0000000000568d9a in PyEval_EvalFrameEx (throwflag=0,
    f=Frame 0x7f74b8392220, for file /home/alvie/code/xxx/.venv/lib/python3.8/site-packages/uvicorn/main.py, line 642, in run (app=<Starlette(_debug=True, state=<State(_state={'engine': <CrawlerEngine(_connector_lock=<Lock(_waiters=None, _locked=False, _loop=<Loop at remote 0x3002890>) at remote 0x7f74b7b0a880>, _loader=...) at ../Python/ceval.c:741
#38 _PyEval_EvalCodeWithName (_co=<optimized out>, globals=<optimized out>, locals=<optimized out>, args=<optimized out>,
    argcount=<optimized out>, kwnames=<optimized out>, kwargs=0x7f74c0a129b8, kwcount=<optimized out>, kwstep=1, defs=0x0, defcount=0, kwdefs=0x0, closure=0x0, name='run', qualname='run') at ../Python/ceval.c:4298
#39 0x00000000005f5b33 in _PyFunction_Vectorcall (func=<optimized out>, stack=0x7f74c0a129b0, nargsf=<optimized out>,
    kwnames=<optimized out>) at ../Objects/call.c:436
#40 0x000000000056bc9b in _PyObject_Vectorcall (kwnames=('host', 'port'), nargsf=<optimized out>, args=<optimized out>,
    callable=<function at remote 0x7f74bfd739d0>) at ../Include/cpython/abstract.h:127
#41 call_function (kwnames=('host', 'port'), oparg=<optimized out>, pp_stack=<synthetic pointer>, tstate=<optimized out>)
    at ../Python/ceval.c:4963
#42 _PyEval_EvalFrameDefault (f=<optimized out>, throwflag=<optimized out>) at ../Python/ceval.c:3515
#43 0x0000000000568d9a in PyEval_EvalFrameEx (throwflag=0, f=Frame 0x7f74c0a12840, for file crawler/main.py, line 7, in <module> ())
    at ../Python/ceval.c:741
#44 _PyEval_EvalCodeWithName (_co=<optimized out>, globals=<optimized out>, locals=<optimized out>, args=<optimized out>,
    argcount=<optimized out>, kwnames=<optimized out>, kwargs=0x0, kwcount=<optimized out>, kwstep=2, defs=0x0, defcount=0, kwdefs=0x0,
    closure=0x0, name=0x0, qualname=0x0) at ../Python/ceval.c:4298
#45 0x000000000068cdc7 in PyEval_EvalCodeEx (closure=0x0, kwdefs=0x0, defcount=0, defs=0x0, kwcount=0, kws=0x0, argcount=0, args=0x0,
    locals=<optimized out>, globals=<optimized out>, _co=<optimized out>) at ../Python/ceval.c:4327
#46 PyEval_EvalCode (co=<optimized out>, globals=<optimized out>, locals=<optimized out>) at ../Python/ceval.c:718

#47 0x000000000067e161 in run_eval_code_obj (co=0x7f74c09d0660,
    globals={'__name__': '__main__', '__doc__': None, '__package__': None, '__loader__': <SourceFileLoader(name='__main__', path='crawler/main.py') at remote 0x7f74c09bf220>, '__spec__': None, '__annotations__': {}, '__builtins__': <module at remote 0x7f74c0a240e0>, '__file__': 'crawler/main.py', '__cached__': None, 'uvicorn': <module at remote 0x7f74c087cf90>, ...,
    locals={'__name__': '__main__', '__doc__': None, '__package__': None, '__loader__': <SourceFileLoader(name='__main__', path='crawler/main.py') at remote 0x7f74c09bf220>, '__spec__': None, '__annotations__': {}, '__builtins__': <module at remote 0x7f74c0a240e0>, '__file__': 'crawler/main.py', '__cached__': None, 'uvicorn': <module at remote 0x7f74c087cf90>, ...) at ../Python/pythonrun.c:1166
#48 0x000000000067e1df in run_mod (mod=<optimized out>, filename=<optimized out>,
    globals={'__name__': '__main__', '__doc__': None, '__package__': None, '__loader__': <SourceFileLoader(name='__main__', path='crawler/main.py') at remote 0x7f74c09bf220>, '__spec__': None, '__annotations__': {}, '__builtins__': <module at remote 0x7f74c0a240e0>, '__file__': 'crawler/main.py', '__cached__': None, 'uvicorn': <module at remote 0x7f74c087cf90>, ..., flags=<optimized out>, arena=<optimized out>)
    at ../Python/pythonrun.c:1188
#49 0x000000000067e281 in pyrun_file (fp=fp@entry=0x1fc0d70, filename=filename@entry='crawler/main.py', start=start@entry=257,

    globals=globals@entry={'__name__': '__main__', '__doc__': None, '__package__': None, '__loader__': <SourceFileLoader(name='__main__', path='crawler/main.py') at remote 0x7f74c09bf220>, '__spec__': None, '__annotations__': {}, '__builtins__': <module at remote 0x7f74c0a240e0>, '__file__': 'crawler/main.py', '__cached__': None, 'uvicorn': <module at remote 0x7f74c087cf90>, ... , closeit=closeit@entry=1, flags=0x7ffd969d35a8)
    at ../Python/pythonrun.c:1085
#50 0x000000000067e627 in pyrun_simple_file (flags=0x7ffd969d35a8, closeit=1, filename='crawler/main.py', fp=0x1fc0d70)
    at ../Python/pythonrun.c:439
#51 PyRun_SimpleFileExFlags (fp=0x1fc0d70, filename=<optimized out>, closeit=1, flags=0x7ffd969d35a8) at ../Python/pythonrun.c:472
#52 0x00000000006b6e62 in pymain_run_file (cf=0x7ffd969d35a8, config=0x1fc1180) at ../Modules/main.c:385
#53 pymain_run_python (exitcode=0x7ffd969d35a0) at ../Modules/main.c:610
#54 Py_RunMain () at ../Modules/main.c:689
#55 0x00000000006b71ed in Py_BytesMain (argc=<optimized out>, argv=<optimized out>) at ../Modules/main.c:743
#56 0x00007f74c0f6e0b3 in __libc_start_main (main=0x4ef190 <main>, argc=2, argv=0x7ffd969d3788, init=<optimized out>,
    fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7ffd969d3778) at ../csu/libc-start.c:308
#57 0x00000000005f96de in _start () at ../Include/internal/pycore_pyerrors.h:13

python: src/unix/core.c:930: uv__io_stop: Assertion `loop->watchers[w->fd] == w' failed.

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