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Date:	Mon, 25 Feb 2019 11:03:00 +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 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 dl=
l 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-bi=
t only,
> > since that was the only arch on which I could produce the problem relia=
bly.
> > Previously I got the error every time I ran emacs.  I just tried 5 time=
s with
> > the new snapshot and only got the error twice.
>=20
> I withdraw that statement.  After further tries, it's back to happening e=
very time.
>=20
> > I'll work on this some more tomorrow and see if I can modify the emacs =
code so
> > that it gives me the full error message from Cygwin.

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.


Sorry,
Corinna

--=20
Corinna Vinschen
Cygwin Maintainer

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