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Date:	Fri, 16 Aug 2013 13:14:16 +0200
From:	Corinna Vinschen <corinna-cygwin AT cygwin DOT com>
To:	cygwin AT cygwin DOT com
Subject:	Re: Octave 3.6.4 cannot plot in X server
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On Aug 15 23:37, Larry Hall (Cygwin) wrote:
> On 8/15/2013 8:38 PM, Yuxiang Wang wrote:
> >Dear all,
> >
> >I have installed Octave with Cygwin 64-bit, under Win 7. Besides
> >octave-3.6.4-1, I also installed xinit and xlaunch according to the
> >doc, and gnuplot just in case.
> >
> >However, when I start X terminal, open octave (that all went
> >successfully) and enter plot(1:5), I got the following message:
> >
> >octave:1> plot(1:5)
> >       0 [main] octave-3.6.4 2708 child_info_fork::abort:
> >C:\cygwin64\bin\cygoctave-1.dll: Loaded to different address:
> >parent(0xF00000) !=3D ch
> >error: popen2: process creation failed -- Resource temporarily unavailab=
le
> >error: called from:
> >error:   /usr/share/octave/3.6.4/m/plot/private/__gnuplot_open_stream__.m
> >at line 30, column 44
> >error:   /usr/share/octave/3.6.4/m/plot/__gnuplot_drawnow__.m at line
> >72, column 19
> >
> >Would anyone please help me with this?
>=20
> In 64-bit land, the available address space for Cygwin DLLs is much
> increased.  This should theoretically eliminate the "casual" overlap
> of address spaces for loaded DLLs, which was a common fork failure vector
> in 32-bit land.

Not exactly eliminated, but drastically reduced.  The problem is, the
hash algorithm used by ld to compute a default DLL load address is not
exactly bullet proof, not even with such a big address space we have
now available for DLLs.  It still requires to run rebase to be
on the safe side.

However, I just found a problem in the 64 distro which results in not
running autorebase as part of an update.  This should be fixed soon.

For the time being, stop all Cygwin processes, start a naked dash and
run /usr/bin/rebaseall.


Corinna

--=20
Corinna Vinschen                  Please, send mails regarding Cygwin to
Cygwin Maintainer                 cygwin AT cygwin DOT com
Red Hat

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