Fork issue with timerfd

[Ken Brown]

On 3/8/2019 5:03 PM, Ken Brown wrote:
> On 3/8/2019 3:22 PM, Corinna Vinschen wrote:
>> On Mar  8 20:10, Rockefeller, Harry wrote:
>>>>>> peter@D11934N ~
>>>>>> $       1 [main] emacs 489 C:\CygWin\bin\emacs-w32.exe: *** fatal
>>>>>> error -
>>>>>> CreateThread failed for pipesel - 0x0<0x0>, Win32 error 8
>>>>>
>>>>> I couldn't directly reproduce this issue, but I saw emacs using more
>>>>> an more memory while the cursor was blinking.  I found a resource leak
>>>>> in posix timers which was probably the cause for this problem.
>>>>>
>>>>> I pushed a patch and uploaded new developer snapshots to
>>>>> https://cygwin.com/snapshots/
>>>>>
>>>>> Please test.
>>>> I tested this:
>>>> https://cygwin.com/snapshots/x86/cygwin1-20190308.dll.xz
>>>
>>>> emacs was on for a long time, did not crash and as far as could judge it did not leak memory.
>>>
>>>> But it froze a couple of times which I cannot recall I have ever experienced before. I mean it suddenly became deaf and dumb and while I > > was actively editing the text, both the text area and the menu line got unresponsive. I could only shut it down from the task manager,
>>>> because the red X didn't work either.
>>
>> What the heck.  The 0308 snapshot was supposed to fix these hangs as
>> described in https://cygwin.com/ml/cygwin/2019-03/msg00160.html
>>
>> Are you sure it was the 0308 snapshot and not by any chance the 0306 one?
>>
>> I can't reproduce this with 0308.  I'm typing lots and lots in emacs,
>> doing copy/paste with the mouse, and it just works with 0308.
>>
>>>> On the next week I will try the debug version in the hope that it can make a trace or something helpful. Is there a guide somewhere how to > use it?
>>
>> Install the cygwin1.dbg file into /bin and When Emacs hangs, attach with
>> gdb and print the backtrace of each thread.  That should give a hint.
>>
>>> I have been running https://cygwin.com/snapshots/x86/cygwin1-20190306.dll.xz , i.e., March 6th
>>> For a couple hours yesterday and all day today along with Ken Brown's test version of emacs (GNU Emacs 26.1.92)
>>> And have not had a hiccup.
>>> (Well, to be truthful, I'm running a lot more of Ken Brown's test software than just emacs.)
>>
>> Can you please test the 0308 snapshot with stock emacs, too?
>>
>> Ken, any chance you could test this as well?  If there really are still
>> hangs with current emacs and the 0308 snapshot, I might need a bit of
>> help.  Some kind of reproducer or some input as to the nature of the
>> hangs would be nice.
> 
> Yes, I'll fire it up now and report back tomorrow.

I used stock emacs-X11 with the 0308 snapshot for about two hours after writing 
this.  I then left it idle overnight and resumed this morning.  I haven't seen 
any problems.  It's still running, and I'll be using it again later today, after 
which I'll send one more report.

Ken

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