Re: bootstrap & memory allocation troubles

[Giorgos Keramidas <keramida@ceid.upatras.gr>]

On 2006-01-13 17:13, Stefan Monnier <monnier@iro.umontreal.ca> wrote:
>>     Can you try and undefine HAVE_POSIX_MEMALIGN so as to tell Emacs not
>>     to use it, so we can see if it's related or if it's a completely
>>     different problem (maybe a problem with unexec)?
>
>> Hmmm.  Comment it out HAVE_POSIX_MEMALIGN in src/config.h allows Emacs
>> to bootstrap quite fine with the new malloc() implementation too.  Very
>> nice.  At least, we know how to repeat and work around the bug now :)
>

> So the problem is either in the implementation of posix_memalign, or
> in my use of it in src/alloc.c.
>
> Can you try and rebuilt with -DENABLE_CHECKING so as to activate the
> `eassert' I have sprinkled in the src/alloc.c code?
>
> Just to be sure, try with -DENABLE_CHECKING for both cases (with and
> without HAVE_POSIX_MEMALIGN).
>
> Since Emacs's posix_memalign code has already been used for more than
> a year under GNU/Linux and probably more platforms, I'm tempted to say
> the bug is in FreeBSD's new implementation.  But you never know.

I configured Emacs with:

	env CC='cc' CPPFLAGS='-DENABLE_CHECKING' MAKE='gmake' \
	    ./configure --prefix="$HOME/opt" --without-x

On FreeBSD 7.0-CURRENT (amd64) with -DENABLE_CHECKING and the current
posix_memalign(), the build crashes repeatably with:

2006-01-14 00:21:00.000000 - Generating autoloads for calendar/parse-time.el...
2006-01-14 00:21:00.000000 - Generating autoloads for calendar/parse-time.el...done
2006-01-14 00:21:00.000000 - Generating autoloads for progmodes/pascal.el...
2006-01-14 00:21:00.000000 - Generating autoloads for progmodes/pascal.el...done
2006-01-14 00:21:01.000000 -
2006-01-14 00:21:01.000000 - Emacs fatal error: alloc.c:2678: assertion failed: XTYPE (cons_free_list) == 0
2006-01-14 00:21:03.000000 - Fatal error (6)Abort trap (core dumped)
2006-01-14 00:21:03.000000 - gmake[2]: *** [autoloads] Error 134
2006-01-14 00:21:03.000000 - gmake[2]: Leaving directory `/home/keramida/ws/cvs-emacs/emacs/lisp'
2006-01-14 00:21:03.000000 - gmake[1]: *** [bootstrap-build] Error 2
2006-01-14 00:21:03.000000 - gmake[1]: Leaving directory `/home/keramida/ws/cvs-emacs/emacs'
2006-01-14 00:21:03.000000 - gmake: *** [bootstrap] Error 2

When I disable posix_memalign(), no assertion is triggered, even with
-DENABLE_CHECKING.