Going back through archives I found this from a couple of years ago.
Seems to be the same problem, but there was no resolution posted.
https://cygwin.com/ml/cygwin/2015-07/msg00439.html
At least I know I'm not the only one.
Just to be thorough, I just tried fully removing Cygwin, rebooting,
reinstalling but it didn't help. I still get the same problem with X.
On Wed, Feb 1, 2017 at 1:09 PM, Jason Ahrens <cyg...@cougarcorp.net> wrote:
> I installed Cygwin/X following the directions on https://x.cygwin.com/
> and the linked howto.
>
> The install seems to have gone fine with no errors popping up.
>
> However there seems to be a problem starting X properly. When I use
> 'startxwin' the icon appears in the system tray, but nothing seems
> capable of launching.
>
> The .xsession-error log shows fork commands failing like so:
>
> Failed to connect to socket /tmp/fam-ahrens/fam-
> 802216072 [unknown (0x2A24)] xwin-xdg-menu 11160 fork: child -1 -
> forked process 6804 died unexpectedly, retry 0, exit code 0xE0C00D5C,
> errno 11
> fork() to run command failed
>
> I found a few references suggesting rebasing may help, so I followed
> http://cygwin.wikia.com/wiki/Rebaseall a couple of times (making sure
> to run the no-package setup), even rebooting between just to be sure,
> but it still happens.
>
> Searching for that exit code only found one hit (not in cygwin) but no answer.
>
> To see if it was something with multiwindow mode, I tried running with
> just an xterm and a root window
> https://x.cygwin.com/docs/ug/using.html#using-starting-startx
> startx /usr/bin/xterm
>
> The root window looked to pop up, then disappeared a second later
>
> All my installed Cygwin packages are up to date. My Windows version
> reports itself as Microsoft Windows [Version 10.0.14393]
>
> Just looking for guidance on what else to try. X and related
> applications seem to be the only things suffering from this, I can run
> all CLI tools fine from the terminal.
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