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Date:	Mon, 25 Feb 2019 21:20:50 +0100
From:	Corinna Vinschen <corinna-cygwin AT cygwin DOT com>
To:	Ken Brown <kbrown AT cornell DOT edu>
Cc:	"cygwin AT cygwin DOT com" <cygwin AT cygwin DOT com>
Subject:	Re: Fork issue with timerfd
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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 firs=
t 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 for=
k!
> > >>>>>          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?
> > >>>
> > >>> No, better try this:
> > >>> [...]
> > >>
> > >> Even if this doesn't fully fix your problem, the patch itself is
> > >> certainly better than the former code, so I pushed it.  I also
> > >> uploaded new developer snapshots to https://cygwin.com/snapshots/
> > >> for testing.
> > >=20
> > > It's better, but not completely fixed.  At the moment I'm testing 32-=
bit only,
> > > since that was the only arch on which I could produce the problem rel=
iably.
> > > Previously I got the error every time I ran emacs.  I just tried 5 ti=
mes with
> > > the new snapshot and only got the error twice.
> >=20
> > I withdraw that statement.  After further tries, it's back to happening=
 every time.
> >=20
> > > I'll work on this some more tomorrow and see if I can modify the emac=
s code so
> > > that it gives me the full error message from Cygwin.
>=20
> I had a late night inspiration, telling me that my timerfd
> implementation has a design flaw in terms of fork/exec timer
> sharing.  I guess I should fix that first.  Just ignore the
> timerfd stuff for a bit, I'm working on that.

I pushed a patch and uploaded new developer snapshots to
https://cygwin.com/snapshots/

Please try.


Thanks,
Corinna

--=20
Corinna Vinschen
Cygwin Maintainer

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