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bug#33174: 27.0.50; Dump fails on GNU/Linux ppc64le
From: |
Thomas Fitzsimmons |
Subject: |
bug#33174: 27.0.50; Dump fails on GNU/Linux ppc64le |
Date: |
Sat, 27 Oct 2018 09:16:17 -0400 |
User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/27.0.50 (gnu/linux) |
Thomas Fitzsimmons <fitzsim@fitzsim.org> writes:
> 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 <eggert@cs.ucla.edu>
> 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.
It looks like this segmentation fault is influenced by the setting in
/proc/sys/kernel/randomize_va_space.
Running by hand in src (with the patch in question applied):
./temacs --batch --load loadup bootstrap
- if randomize_va_space contains 2, bootstrap fails:
segfaults:
Dumping under the name emacs
**************************************************
Warning: Your system has a gap between BSS and the
heap (752378248 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
Segmentation fault
- if randomize_va_space contains 1 or 0, bootstrap succeeds:
Loading /home/fitzsim/sources/emacs/lisp/tooltip.el (source)...
Finding pointers to doc strings...
Finding pointers to doc strings...done
Dumping under the name emacs
22496304 of 33554432 static heap bytes used
99079 pure bytes used
Thomas
- bug#33174: 27.0.50; Dump fails on GNU/Linux ppc64le, Thomas Fitzsimmons, 2018/10/27
- bug#33174: 27.0.50; Dump fails on GNU/Linux ppc64le,
Thomas Fitzsimmons <=
- bug#33174: 27.0.50; Dump fails on GNU/Linux ppc64le, Paul Eggert, 2018/10/27
- bug#33174: 27.0.50; Dump fails on GNU/Linux ppc64le, Paul Eggert, 2018/10/28
- bug#33174: 27.0.50; Dump fails on GNU/Linux ppc64le, Thomas Fitzsimmons, 2018/10/28
- bug#33174: 27.0.50; Dump fails on GNU/Linux ppc64le, Paul Eggert, 2018/10/28
- bug#33174: 27.0.50; Dump fails on GNU/Linux ppc64le, Thomas Fitzsimmons, 2018/10/29
- bug#33174: 27.0.50; Dump fails on GNU/Linux ppc64le, Paul Eggert, 2018/10/29
- bug#33174: 27.0.50; Dump fails on GNU/Linux ppc64le, Thomas Fitzsimmons, 2018/10/28
- bug#33174: 27.0.50; Dump fails on GNU/Linux ppc64le, Paul Eggert, 2018/10/29
- bug#33174: 27.0.50; Dump fails on GNU/Linux ppc64le, Thomas Fitzsimmons, 2018/10/29
- bug#33174: 27.0.50; Dump fails on GNU/Linux ppc64le, Paul Eggert, 2018/10/30