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From: Ken Brown <kbrown AT cornell DOT edu>
To: "cygwin AT cygwin DOT com" <cygwin AT cygwin DOT com>
Subject: Re: Fork issue with timerfd
Date: Tue, 26 Feb 2019 13:39:07 +0000
Message-ID: <d367bf35-3c62-15e9-f292-ff709066ec4c@cornell.edu>
References: <ca9a38b7-c147-78a3-0660-70aa65b41eb3 AT cornell DOT edu> <20190224185524 DOT GE4133 AT calimero DOT vinschen DOT de> <20190224190908 DOT GB10574 AT calimero DOT vinschen DOT de> <20190224195255 DOT GF4133 AT calimero DOT vinschen DOT de> <133d62b5-afd5-ae73-b950-7b50471e111e AT cornell DOT edu> <3142aff3-c7c3-187f-233e-089c5dc15ea2 AT cornell DOT edu> <20190225100300 DOT GH4133 AT calimero DOT vinschen DOT de> <20190225202050 DOT GP4133 AT calimero DOT vinschen DOT de> <e2cae181-b96a-2ce0-34b8-f8a48714c828 AT cornell DOT edu> <20190226085730 DOT GQ4133 AT calimero DOT vinschen DOT de> <20190226094838 DOT GS4133 AT calimero DOT vinschen DOT de>
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On 2/26/2019 4:48 AM, Corinna Vinschen wrote:
> On Feb 26 09:57, Corinna Vinschen wrote:
>> On Feb 26 00:01, Ken Brown wrote:
>>> On 2/25/2019 3:20 PM, Corinna Vinschen wrote:
>>>> On Feb 25 11:03, Corinna Vinschen wrote:
>>>>> On Feb 25 03:21, Ken Brown wrote:
>>>>>> On 2/24/2019 9:23 PM, Ken Brown wrote:
>>>>>>> On 2/24/2019 2:52 PM, Corinna Vinschen wrote:
>>>>>>>> On Feb 24 20:09, Corinna Vinschen wrote:
>>>>>>>>> On Feb 24 19:55, Corinna Vinschen wrote:
>>>>>>>>>> On Feb 24 17:27, Ken Brown wrote:
>>>>>>>>>>> I'm seeing sporadic errors like this on 64-bit Cygwin when I first start emacs:
>>>>>>>>>>>
>>>>>>>>>>>            0 [main] emacs-X11 864 C:\cygwin64\bin\emacs-X11.exe: *** fatal error in
>>>>>>>>>>> forked process - Can't recreate shared timerfd section during fork!
>>>>>>>>>>>            0 [main] emacs 860 dofork: child 864 - died waiting for dll loading, errno 11
>>>>>>>>>>>
>>>>>>>>>>> If I exit and restart, everything will be fine almost every time.
>>>>>>>>>>
>>>>>>>>>> I think I see where the thinko was here.  Can you try this?
>>>>>>> [...]
>>>>>>> It's better, but not completely fixed.  At the moment I'm testing 32-bit only,
>>>>>>> [...]
>>>>>> I withdraw that statement.  After further tries, it's back to happening every time.
>>>>>>
>>>> [...]
>>>> I pushed a patch and uploaded new developer snapshots to
>>>> https://cygwin.com/snapshots/
>>>
>>> The x86 fork problem seems to be fixed.  I started emacs several times and
>>> listed directories without any failure.
>>
>> Thanks for testing!
>>
>>> I did get the following, however, during one of the trials (while emacs was idle):
>>>
>>> 1 [main] emacs 246 C:\Users\kbrown\src\emacs\i686-emacs26\src\emacs.exe: ***
>>> fatal error - CreateThread failed for pipesel - 0x0<0x0>, Win32 error 8
>>
>> It's hard to imagine how this is related.  CreateThread fails due to
>> memory problems?!?  A timerfd does not use a lot of resources, just a
>> 96 bytes struct on the cygheap, a single page shared memory region, and
>                                    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^'
> 
> This was at least the intention, but I accidentally created a 64K
> region.  Fixed in git and new snapshort forthcoming.

Looks good so far.  I've been running emacs on x86 for about an hour, running 
lots of subprocesses, with no problems.  I'll keep using it throughout the day.

Ken

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