[debbugs-tracker] bug#33174: closed (27.0.50; Dump fails on GNU/Linux ppc64le)

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Your message dated Sun, 11 Nov 2018 22:39:56 -0800
with message-id <address@hidden>
and subject line Re: bug#33174: 27.0.50; Dump fails on GNU/Linux ppc64le
has caused the debbugs.gnu.org bug report #33174,
regarding 27.0.50; Dump fails on GNU/Linux ppc64le
to be marked as done.

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33174: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=33174
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> --- Begin Message ---
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>
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> Subject: 
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> 27.0.50; Dump fails on GNU/Linux ppc64le
>
>
>
>
> Date: 
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> Sat, 27 Oct 2018 06:35:17 -0400
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>
>
>
> Hi Paul,
>
> On ppc64le Debian GNU/Linux 9, I'm seeing a bootstrap failure on the
> master and emacs-26 branches that I didn't see the last time I built
> Emacs:
>
> [...]
> Dumping under the name emacs
> **************************************************
> Warning: Your system has a gap between BSS and the
> heap (424960392 bytes).  This usually means that exec-shield
> or something similar is in effect.  The dump may
> fail because of this.  See the section about
> exec-shield in etc/PROBLEMS for more information.
> **************************************************
> 22496304 of 33554432 static heap bytes used
> Makefile:749: recipe for target 'bootstrap-emacs' failed
> make[1]: *** [bootstrap-emacs] Segmentation fault
> make[1]: Leaving directory '/home/fitzsim/sources/emacs/src'
> Makefile:421: recipe for target 'src' failed
> make: *** [src] Error 2
>
> I bisected the failure to:
>
> commit 65889a6d127fcbbbdc1e74d26036e91bd24d1405
> Author: Paul Eggert <address@hidden>
> Date:   Sun Jul 8 09:04:02 2018 -0700
>
>     Fix bootstrap infloop in GNU/Linux alpha
>     
>     * src/emacs.c (main): Do not re-exec if EMACS_HEAP_EXEC
>     is already set (Bug#32083).
>
> If I revert that commit's patch, the build succeeds.
>
> Thomas
>
>
>
> --- End Message ---

--- Begin Message --- Subject: Re: bug#33174: 27.0.50; Dump fails on GNU/Linux ppc64le Date: Sun, 11 Nov 2018 22:39:56 -0800 User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.2.1

Thomas Fitzsimmons wrote:

Actually, EMACS_HEAP_EXEC is true!

OK, thanks, that explains things. I installed the first attached patch to the emacs-26 branch as a quick hack to work around the problem, and the second attached patch to the master branch to come up with a better way to address the underlying issue that doesn't involve fiddling with environment variables. Please let us know if this doesn't work for your platform, as I've tested this only on x86-64.

0001-Work-around-dumping-bug-on-GNU-Linux-ppc64le.patch
Description: Text Data

0001-Fix-dumping-on-GNU-Linux-ppc64le.patch
Description: Text Data

--- End Message ---