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Date:	Fri, 30 Aug 2013 21:00:48 +0200
From:	Corinna Vinschen <corinna-cygwin AT cygwin DOT com>
To:	cygwin AT cygwin DOT com
Subject:	Re: xz -9 : Cannot allocate memory
Message-ID:	<20130830190048.GA21571@calimero.vinschen.de>
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On Aug 30 19:46, Corinna Vinschen wrote:
> On Aug 30 12:58, Achim Gratz wrote:
> > Corinna Vinschen <corinna-cygwin <at> cygwin.com> writes:
> > > Yes, looks normal and expected from what you observed.  mmap commits
> > > memory top-down and that was apparently the first free slot big enough
> > > to fullfil the request.  The default heap size is 384 Megs and then
> > > there's apparently not enough space anywhere.
> >=20
> > Sorry if I'm dense, but does this mean that setting the default heap si=
ze to
> > zero does in fact mean it's trying to use 374MiB... wait, yes it is: the
> > memory map is the same when I'm setting the initial heap size to 384MiB=
 with
> > peflags.
> >=20
> > So, even though that rather large heap is essentially unused at the poi=
nt of
> > failure and there is enough memory free just beyond the heap, the alloc=
ation
> > still fails because both the existing heap and the free space are both
> > smaller than what's requested?
>=20
> Well, good question.  You could debug the sbrk function and see why
> it fails to reserve the space.

I just debugged this and it seems our sbrk implementation has a serious
problem to extend the heap if the new chunk of memory requires to commit
some of the existing heap and to reserve and commit some more space.
It tries to reserve memory using the wrong address and the wrong size.
It also uses a too simple method to commit the memory.  I'll apply a fix
shortly.


Corinna

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

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