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

From: GNU bug Tracking System
Subject: [debbugs-tracker] bug#33174: closed (27.0.50; Dump fails on GNU/Linux ppc64le)
Date: Mon, 12 Nov 2018 06:41:01 +0000

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.

(If you believe you have received this mail in error, please contact

33174: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=33174
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--- Begin Message --- Subject: 27.0.50; Dump fails on GNU/Linux ppc64le Date: Sat, 27 Oct 2018 06:35:17 -0400
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

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.


--- 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.

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

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

--- End Message ---

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