On Dec 1 21:07, nu774 wrote: > >There must be a bug in the new CMD somewhere. But, anyway, I'll look > >into it when I finally managed to update my W10 test machine. > > No, cmd.exe is just an example. Any 32bit process can be an trigger. > I guess something has changed in TH2 kernel regarding process memory > management or something that interferes cygwin's fork(). If that only happens w/ 64 bit Cygwin started from a 32 bit parent, then there's some foul-up in the WOW64 layer in terms of starting 64 bit processes, perhaps. Sigh, it's a rather unexpected change after it worked fine for so long :( Corinna -- Corinna Vinschen Please, send mails regarding Cygwin to Cygwin Maintainer cygwin AT cygwin DOT com Red Hat