GNU bug report logs - #35711
emacs crashes on m68k after d2f1971dd5

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From: help-debbugs <at> gnu.org (GNU bug Tracking System)
To: Paul Eggert <eggert <at> cs.ucla.edu>
Cc: tracker <at> debbugs.gnu.org
Subject: bug#35711: closed (emacs crashes on m68k after d2f1971dd5)
Date: Tue, 14 May 2019 18:12:02 +0000

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Your message dated Tue, 14 May 2019 11:10:52 -0700
with message-id <9c64b198-b2f4-3fd5-75ea-22789668fbaf <at> cs.ucla.edu>
and subject line Re: emacs crashes on m68k after d2f1971dd5
has caused the debbugs.gnu.org bug report #35711,
regarding emacs crashes on m68k after d2f1971dd5
to be marked as done.

(If you believe you have received this mail in error, please contact
help-debbugs <at> gnu.org.)


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From: John Paul Adrian Glaubitz <glaubitz <at> physik.fu-berlin.de>
To: bug-gnu-emacs <at> gnu.org
Cc: Andreas Schwab <schwab <at> suse.de>,
 Michael Karcher <debian <at> mkarcher.dialup.fu-berlin.de>,
 Paul Eggert <eggert <at> cs.ucla.edu>
Subject: emacs crashes on m68k after d2f1971dd5
Date: Mon, 13 May 2019 14:15:16 +0200

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Hello!

The commit [1] "Port flexible array members to GCC + valgrind" (d2f1971dd5)
broke emacs on m68k. This is because the new code aligns blocks of 1-byte
strings to 16 bit on m68k which is the default alignment on m68k.

The crash on m68k looks like this [2]:

/bin/mkdir -p ../etc
/usr/bin/make -C ../lisp update-subdirs
make[4]: Entering directory '/<<BUILDDIR>>/emacs-26.1+1/debian/build-gtk/lisp'
make[4]: Leaving directory '/<<BUILDDIR>>/emacs-26.1+1/debian/build-gtk/lisp'
./temacs --batch  --load loadup bootstrap
Loading loadup.el (source)...
Using load-path (/<<BUILDDIR>>/emacs-26.1+1/debian/build-src/lisp /<<BUILDDIR>>/emacs-26.1+1/debian/build-src/lisp/emacs-lisp /<<BUILDDIR>>/emacs-26.1+1/debian/build-src/lisp/progmodes /<<BUILDDIR>>/emacs-26.1+1/debian/build-src/lisp/language /<<BUILDDIR>>/emacs-26.1+1/debian/build-src/lisp/international /<<BUILDDIR>>/emacs-26.1+1/debian/build-src/lisp/textmodes /<<BUILDDIR>>/emacs-26.1+1/debian/build-src/lisp/vc)
Loading emacs-lisp/byte-run (source)...
Loading emacs-lisp/backquote (source)...
Loading subr (source)...
qemu: uncaught target signal 11 (Segmentation fault) - core dumped
make[3]: *** [Makefile:738: bootstrap-emacs] Segmentation fault

The attached patch by Michael Karcher fixes the problem.

Thanks,
Adrian

> [1] http://git.savannah.gnu.org/cgit/emacs.git/commit/?id=d2f1971dd570439da4198fa76603b53b072060f8
> [2] https://buildd.debian.org/status/fetch.php?pkg=emacs&arch=m68k&ver=1%3A26.1%2B1-3.2&stamp=1549253883&raw=0

-- 
 .''`.  John Paul Adrian Glaubitz
: :' :  Debian Developer - glaubitz <at> debian.org
`. `'   Freie Universitaet Berlin - glaubitz <at> physik.fu-berlin.de
  `-    GPG: 62FF 8A75 84E0 2956 9546  0006 7426 3B37 F5B5 F913

[fix-m68k-crash.patch (text/x-patch, attachment)]

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From: Paul Eggert <eggert <at> cs.ucla.edu>
To: John Paul Adrian Glaubitz <glaubitz <at> physik.fu-berlin.de>,
 35711-done <at> debbugs.gnu.org
Cc: Andreas Schwab <schwab <at> suse.de>,
 Michael Karcher <debian <at> mkarcher.dialup.fu-berlin.de>
Subject: Re: emacs crashes on m68k after d2f1971dd5
Date: Tue, 14 May 2019 11:10:52 -0700

On 5/14/19 2:10 AM, John Paul Adrian Glaubitz wrote:
> backporting your current
> patch to the 26 branch fixes the bug for me for emacs26.
>
> Thus, could you backport your patch to the 26 branch?

Thanks for checking. I backported it and am closing the bug report.

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