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Subject: Re: Race condition hangs on multiple mintty/tcsh? Brad Wetmore
To: cygwin@cygwin.com
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From: Thomas Wolff <towo@towo.net>
Message-ID: <cf31ce0f-99f8-68a4-772b-b632e1fb969e@towo.net>
Date: Tue, 11 Aug 2020 19:37:03 +0200
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On 11.08.2020 12:30, Corinna Vinschen wrote:
> On Aug 11 19:02, Takashi Yano via Cygwin wrote:
>> On Tue, 11 Aug 2020 11:37:58 +0200
>> Corinna Vinschen wrote:
>>> On Aug 11 13:59, Takashi Yano via Cygwin wrote:
>>>> Hi Thomas,
>>>>
>>>> On Thu, 6 Aug 2020 15:31:24 +0200
>>>> Thomas Wolff wrote:
>>>>> Am 06.08.2020 um 13:46 schrieb Thomas Wolff:
>>>>>> Am 06.08.2020 um 01:23 schrieb Kevin Schnitzius via Cygwin:
>>>>>>> On Wednesday, August 5, 2020, 06:56:48 PM EDT, Thomas Wolff
>>>>>>> <towo@towo.net> wrote:
>>>>>>>> Am 04.08.2020 um 12:02 schrieb Thomas Wolff:
>>>>>>>>> Am 04.08.2020 um 00:13 schrieb Brad Wetmore via Cygwin:
>>>>>>>>>> Hi,
>>>>>>>>>>
>>>>>>>>>> I generally kick off multiple (10) mintty sessions, and place them
>>>>>>>>>> around the screen.
>>>>>>>>>> [...]
>>>>>> I could reproduce one case of one of three terminals being
>>>>>> unresponsive also with xterm.
>>>>> And it also happens if I drop select() from mintty (and use just
>>>>> non-blocking read()).
>>>>>> Does anybody familiar with pty/select or recent changes have any idea?
>>>> I looked into this problem. After much struggle, I think
>>>> I have found a workaround for this issue.
>>>>
>>>> I am not sure why this solves the issue at all, however,
>>>> this works for me.
>>>>
>>>> Could you please test a patch attached?
>>> Shall I commit the patch and create a developer snapshot for testing?
>> Thanks so much. That would be more convenient for potential testers.
> Done.  Please try the latest snapshot from https://cygwin.com/snapshots/
Thanks. I could not reproduce the issue on one system in ~27 cases. I'd 
like to retest on another system where I could previously produce the 
issue more frequently, but that's currently broken...
Thomas
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