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Subject: Re: 64bit cygwin 2.4.0-0.4 hangs when pinging unresponsive host
To: cygwin AT cygwin DOT com
References: <01f501d12701$d5af6fb0$810e4f10$@vianet.ca> <5654E4E3 DOT 8050605 AT gmail DOT com> <56555DF4 DOT 9090804 AT towo DOT net> <56559566 DOT 7070808 AT gmail DOT com> <565621A3 DOT 3090706 AT gmail DOT com> <20151126201546 DOT GQ2755 AT calimero DOT vinschen DOT de> <20151127150737 DOT GA15906 AT calimero DOT vinschen DOT de>
From: Marco Atzeri <marco DOT atzeri AT gmail DOT com>
Message-ID: <56587B21.50002@gmail.com>
Date: Fri, 27 Nov 2015 16:47:45 +0100
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On 27/11/2015 16:07, Corinna Vinschen wrote:
>>>>   64 $ ping 2.2.2.2
>>>> PING 2.2.2.2 (2.2.2.2): 56 data bytes
>>>>
>>>> ----2.2.2.2 PING Statistics----
>>>> 2 packets transmitted, 0 packets received, 100.0% packet loss
>>>
>>>
>>> the problem seems restricted to the 64bit test version of cygwin.
>>
>> I think this is pure coincidence.  After some hours debugging this
>> problem it seems it's a race condition, architecture-independent and
>> present since quite a while in Cygwin.  In case of ping the race leads
>> to a blocking socket function missing a signal arrived, thus the
>> signal is never handled.  This in turn blocks the next signal from being
>> delivered.
>>
>> I have a potential fix, but I have to test it a bit.  The signal code
>> is pretty complicated...
>
> I created a new developer snapshot (https://cygwin.com/snapshots/) and
> I'm just about writing the release message for the next test release
> 2.4.0-0.5 which both contain a patch for this problem.  Please give
> any of them a try.
>
>
> Thanks,
> Corinna
>


It works fine for me
Regards
Marco

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