Re: Cyg32 on Win64 fails with stack-protector

[Ben RUBSON <ben dot rubson at gmail dot com>]

On 29 May 2018 18:59, Corinna Vinschen wrote:

> Hi Ben,
>
> On Apr 27 19:12, Ben RUBSON wrote:
> > Hi,
> >
> > We are facing an issue with Cygwin 2.10 32 bits running on Windows 64  
> > bits.
> >
> > Issue was found running EncFS FUSE FS using WinFsp.
> >
> > When forking, and calling StartServiceCtrlDispatcher, program fails with
> > 0xC0000028 / STATUS_BAD_STACK.
> >
> > Testing several Cygwin versions reveals that issue was introduced between
> > 2017-11-14 and 2017-12-01.
> > And Bill (WinFsp author) found that compiling with -fno-stack-protector
> > works around the issue.
> >
> > There you can then find the full story and Bill's nice investigation :
> > https://github.com/billziss-gh/winfsp/issues/161
> >
> > Could it be possible something went wrong with Cygwin ?
> >
> > Thank you very much for your support !
>
> Even with Bill's additionl info I have no idea what change in the
> above time frame might be the culprit, especially since no change
> has been made to stack handling.
>
> I suggest to build your own Cygwin and bisect it.

Corinna, could you elaborate please ?
I'm not sure to clearly understand what you mean by bisecting Cygwin.

Thank you !

Ben