Fork issue with timerfd
Corinna Vinschen
corinna-cygwin@cygwin.com
Mon Feb 25 22:01:00 GMT 2019
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?
> > >>>
> > >>> 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.
> > >
> > > 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 reliably.
> > > Previously I got the error every time I ran emacs. I just tried 5 times with
> > > the new snapshot and only got the error twice.
> >
> > I withdraw that statement. After further tries, it's back to happening every time.
> >
> > > 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.
I pushed a patch and uploaded new developer snapshots to
https://cygwin.com/snapshots/
Please try.
Thanks,
Corinna
--
Corinna Vinschen
Cygwin Maintainer
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