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From: Achim Gratz <Stromeko AT nexgo DOT de>
To: cygwin AT cygwin DOT com
Subject: Re: Odd hang in python waiting for child; strace wakes hung process?
References: <CAPF-yOYzTr-jh__S_imaAcdk5Vf4tGD1xFLuTDu4-qsg_+HiCA AT mail DOT gmail DOT com>	<877eq5fedf DOT fsf AT Rainer DOT invalid>	<CAPF-yOb8O+Xhp3yi9wGFFJDvrSA0W24LZ+1adAcga--H7=qaZw AT mail DOT gmail DOT com>
Date: Thu, 22 Mar 2018 18:29:44 +0100
In-Reply-To: <CAPF-yOb8O+Xhp3yi9wGFFJDvrSA0W24LZ+1adAcga--H7=qaZw@mail.gmail.com>	(Dan Kegel's message of "Wed, 21 Mar 2018 15:07:28 -0700")
Message-ID: <87in9o81dj.fsf@Rainer.invalid>
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Dan Kegel writes:
> 1) kill -CONT the-pid doesn't do anything, nor does kill -9.  It's
> truly wedged.

No, you send CONT to all processes (like 'pkill -CONT .'), it seems that
this gets whatever was wedged enough of a kick to retry or time out and
then it (often, not always) it seems to start reaping processes again
and the <defuncts> start to vanish.  You can tell you have one of these
when just doing a ps takes much longer than usual when it hits those
processes.


Regards,
Achim.
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