python fails asyncio tests (py 3.7 & 3.8)
Mark Geisert
mark@maxrnd.com
Tue Dec 1 00:53:43 GMT 2020
Hi Jim,
Jim Bell wrote:
> On 2020-11-21 5:59 AM, Jim Bell wrote:
>> The standard python asyncio tests hang.
>>
>> cd /usr/lib/python3.8/test
>>
>> python3.8 test_asyncore.py -v
>>
>> [...]
>
>
> Using strace, stripping down this very repeatable test, and grabbing the
> source-code snapshot, it looks like winsup/cygwin/select.cc socket_cleanup() is
> waiting forever for the thread to go away.
>
> strace:
>
> 121 6732185 [main] python3.8 13329 select_stuff::cleanup: calling cleanup rout
> ines
> 178 6732363 [main] python3.8 13329 socket_cleanup: si 0x800290E10 si->thread 0
> x18023E758
> -
>
> But I don't see the select_printf("returning") at select.cc:1808, so the
> si->thread->detach() call seems to be blocked forever. I don't see that we make
> it here either:
>
> select.cc:1685 select_printf ("leaving thread_socket");
>
> I see a bool stop_thread field in select_info, inherited by select_socket_info
> (select.h), used by other mechanisms. Seems that could be set by socket_cleanup()
> and used by thread_socket() to break out of its event loops (select.cc lines 1660
> and 1667)
>
> https://cygwin.com/git/?p=newlib-cygwin.git;a=blob;f=winsup/cygwin/select.cc;hb=HEAD#l1796
Thanks for the report and especially for the initial debugging you've done. I've
reproduced the issue on my test machine. No need to supply 'cygcheck -svr' at
this point. I'll investigate this further and keep you posted (on the Cygwin
mailing list).
..mark
More information about the Cygwin
mailing list