bug#22526: 25.0.90; Crash starting gnus

[Eli Zaretskii <eliz@gnu.org>]

> From: Andy Moreton <andrewjmoreton@gmail.com>
> Date: Tue, 16 Feb 2016 01:18:51 +0000
> 
> On Sat 13 Feb 2016, Andy Moreton wrote:
> 
> > On 13/02/2016 15:52, Eli Zaretskii wrote:
> >> Thanks.  Please run Emacs under GDB, and see if you get any of the
> >> debug printouts in mmap_alloc and mmap_realloc when this problem
> >> happens (if it happens).
> >
> > I now have an emacs built from changeset d97f522d3d3f with your patch.
> > After a few runs, I now have a gdb session with:
> >
> > warning: realloc enlarge: VirtualAlloc error 87
> >
> > Program received signal SIGSEGV, Segmentation fault.
> > 0x000000040017209c in make_gap_larger (nbytes_added=0x1000) at
> > ../../src/insdel.c:411
> > 411       *(Z_ADDR) = 0;
> >
> > I will keep the gdb session running for further debugging.
> >
> >     AndyM
> 
> More recent runs, built from changeset d4b93e11a519 no longer seem to
> reproduce this problem.

Too bad.  Let's wait for a few more days, and if it doesn't return,
make the changes for allocation granularity and close the bug.

Thanks.