GNU bug report logs - #23529
Request for fixing randomize_va_space build issues

Previous Next

Full log

View this message in rfc822 format

From: Philippe Vaucher <philippe.vaucher <at> gmail.com>
To: 23529 <at> debbugs.gnu.org
Subject: bug#23529: Request for fixing randomize_va_space build issues
Date: Fri, 13 May 2016 14:18:52 +0200

Hello,

When /proc/sys/kernel/randomize_va_space is 2, emacs fails to build:

    Dumping under the name emacs
    **************************************************
    Warning: Your system has a gap between BSS and the
    heap (20865783 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.
    **************************************************
    /bin/bash: line 7:  8981 Segmentation fault      (core dumped)
./temacs --batch --load loadup bootstrap
    Makefile:815: recipe for target 'bootstrap-emacs' failed
    make[1]: *** [bootstrap-emacs] Error 1
    make[1]: Leaving directory '/tmp/emacs/src'

This is a somewhat known bug:

https://debbugs.gnu.org/db/13/13964.html
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=598234
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=566947
https://bugzilla.redhat.com/show_bug.cgi?id=160814

I know there is a workaround that goes like:

    echo 0 > /proc/sys/kernel/randomize_va_space
    make
    echo 2 > /proc/sys/kernel/randomize_va_space

But in my case this is not possible, I'm building as a user with
limited privileges.

The file /etc/PROBLEMS mention another workaround:

    setarch x86_64 -R make

But this fails with the same error.

I'm far from being the only one with this problem:

https://github.com/boot2docker/boot2docker/issues/1136
https://github.com/ensime/ensime-emacs/issues/369
https://github.com/proot-me/PRoot/issues/52

And basically the workaround is always "set randomize_va_space to 0".

Can someone explain what the real issue is and what we could do to
_really_ fix it? One should be able to compile emacs without changing
kernel parameters!

Thanks in advance,
Philippe

Previous Next

GNU bug tracking system
Copyright (C) 1999 Darren O. Benham, 1997,2003 nCipher Corporation Ltd, 1994-97 Ian Jackson.