Subject: master: `Backtrace after malloc arena is corrupted` causes segfault during build

From: Eric Hanchrow <[email-masked]>
Date: Mon, 02 Mar 2015 03:28:41 +0000

I built emacs from the "master" branch ofhttps://
github.com/emacs-mirror/emacs.  It failed as shown below.

vagrant@vagrant-ubuntu-server-trusty-32:~/git-repositories/3rd-party/emacs$
cat /etc/issue
Ubuntu 14.04.2 LTS \n \l

vagrant@vagrant-ubuntu-server-trusty-32:~/git-repositories/3rd-party/emacs$
uname -a
Linux vagrant-ubuntu-server-trusty-32 3.13.0-46-generic #76-Ubuntu SMP Thu
Feb 26 18:52:49 UTC 2015 i686 i686 i686 GNU/Linux
vagrant@vagrant-ubuntu-server-trusty-32:~/git-repositories/3rd-party/emacs$
git show --stat
commit b74db6347cf5cac1ebd4c604fd5691c588fd8e32
Author: Paul Eggert <[email-masked]>
Date:   Tue Feb 24 16:34:13 2015 -0800

    Backtrace after malloc arena is corrupted

    Without this change, if the malloc arena is corrupted and then
    'backtrace' is called, the backtrace can crash because 'backtrace'
    calls 'malloc'.  For more, please see:
    https://sourceware.org/ml/libc-alpha/2015-02/msg00678.html
    * emacs.c (main): Initialize tables used by 'backtrace'.
    * sysdep.c (emacs_backtrace): Document the newly used part of the API.

 src/ChangeLog | 10 ++++++++++
 src/emacs.c   |  2 ++
 src/sysdep.c  | 12 +++++++++++-
 3 files changed, 23 insertions(+), 1 deletion(-)

vagrant@vagrant-ubuntu-server-trusty-32:~/git-repositories/3rd-party/emacs$
./autogen.sh && ./configure --without-x && make
Checking whether you have the necessary tools...
(Read INSTALL.REPO for more details on building Emacs)

Checking for autoconf (need at least version 2.65)...
ok
Checking for automake (need at least version 1.11)...
ok
Your system has the required tools.
Running 'autoreconf -fi -I m4' ...
configure.ac:756: installing 'build-aux/compile'
configure.ac:139: installing 'build-aux/config.guess'
configure.ac:139: installing 'build-aux/config.sub'
configure.ac:136: installing 'build-aux/install-sh'
configure.ac:136: installing 'build-aux/missing'
lib/Makefile.am: installing 'build-aux/depcomp'
You can now run './configure'.
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configure: WARNING: libacl development library was not found or not usable.
configure: WARNING: GNU Emacs will be built without ACL support.
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Configured for `i686-pc-linux-gnu'.

  Where should the build process find the source code?    .
  What compiler should emacs be built with?               gcc -std=gnu99
-g3 -O2
  Should Emacs use the GNU version of malloc?             yes
      (Using Doug Lea's new malloc from the GNU C Library.)
  Should Emacs use a relocating allocator for buffers?    no
  Should Emacs use mmap(2) for buffer allocation?         no
  What window system should Emacs use?                    none
  What toolkit should Emacs use?                          none
  Where do we find X Windows header files?                NONE
  Where do we find X Windows libraries?                   NONE
  Does Emacs use -lXaw3d?                                 no
  Does Emacs use -lXpm?                                   no
  Does Emacs use -ljpeg?                                  no
  Does Emacs use -ltiff?                                  no
  Does Emacs use a gif library?                           no
  Does Emacs use a png library?                           no
  Does Emacs use -lrsvg-2?                                no
  Does Emacs use imagemagick?                             no
  Does Emacs support sound?                               yes
  Does Emacs use -lgpm?                                   yes
  Does Emacs use -ldbus?                                  yes
  Does Emacs use -lgconf?                                 no
  Does Emacs use GSettings?                               no
  Does Emacs use a file notification library?             yes -lgio (gfile)
  Does Emacs use access control lists?                    no
  Does Emacs use -lselinux?                               yes
  Does Emacs use -lgnutls?                                yes
  Does Emacs use -lxml2?                                  yes
  Does Emacs use -lfreetype?                              no
  Does Emacs use -lm17n-flt?                              no
  Does Emacs use -lotf?                                   no
  Does Emacs use -lxft?                                   no
  Does Emacs directly use zlib?                           yes
  Does Emacs use toolkit scroll bars?                     no

checking that generated files are newer than configure... done
configure: creating ./config.status
config.status: creating ./doc/man/emacs.1
config.status: creating Makefile
config.status: creating lib/Makefile
config.status: creating lib-src/Makefile
config.status: creating oldXMenu/Makefile
config.status: creating doc/emacs/Makefile
config.status: creating doc/misc/Makefile
config.status: creating doc/lispintro/Makefile
config.status: creating doc/lispref/Makefile
config.status: creating src/Makefile
config.status: creating lwlib/Makefile
config.status: creating lisp/Makefile
config.status: creating leim/Makefile
config.status: creating nextstep/Makefile
config.status: creating nt/Makefile
config.status: creating test/automated/Makefile
config.status: creating admin/unidata/Makefile
config.status: creating admin/grammars/Makefile
config.status: creating src/config.h
config.status: executing depfiles commands
config.status: executing src/epaths.h commands
config.status: executing src/.gdbinit commands
config.status: executing doc/emacs/emacsver.texi commands
config.status: executing etc-refcards-emacsver.tex commands
make -C lib all
make[1]: Entering directory
`/home/vagrant/git-repositories/3rd-party/emacs/lib'
  GEN      alloca.h
  GEN      c++defs.h
  GEN      arg-nonnull.h
  GEN      warn-on-use.h
  GEN      dirent.h
  GEN      fcntl.h
  GEN      inttypes.h
  GEN      signal.h
  GEN      stdalign.h
  GEN      stddef.h
  GEN      stdio.h
  GEN      stdlib.h
  GEN      string.h
  GEN      sys/select.h
  GEN      sys/stat.h
  GEN      sys/time.h
  GEN      sys/types.h
  GEN      time.h
  GEN      unistd.h
make  all-am
make[2]: Entering directory
`/home/vagrant/git-repositories/3rd-party/emacs/lib'
  CC       allocator.o
  CC       binary-io.o
  CC       c-ctype.o
  CC       c-strcasecmp.o
  CC       c-strncasecmp.o
  CC       careadlinkat.o
  CC       close-stream.o
  CC       count-one-bits.o
  CC       count-trailing-zeros.o
  CC       md5.o
  CC       sha1.o
  CC       sha256.o
  CC       sha512.o
  CC       dtoastr.o
  CC       dtotimespec.o
  CC       filemode.o
  CC       gettime.o
  CC       pipe2.o
  CC       acl-errno-valid.o
  CC       file-has-acl.o
  CC       qcopy-acl.o
  CC       qset-acl.o
  CC       stat-time.o
  CC       strftime.o
  CC       timespec.o
  CC       timespec-add.o
  CC       timespec-sub.o
  CC       u64.o
  CC       unistd.o
  CC       utimens.o
  CC       openat-die.o
  CC       save-cwd.o
  CC       fcntl.o
  CC       sig2str.o
  AR       libgnu.a
make[2]: Leaving directory
`/home/vagrant/git-repositories/3rd-party/emacs/lib'
make[1]: Leaving directory
`/home/vagrant/git-repositories/3rd-party/emacs/lib'
make -C lib-src all
make[1]: Entering directory
`/home/vagrant/git-repositories/3rd-party/emacs/lib-src'
  CC       regex.o
  CCLD     etags
  CCLD     ctags
  CCLD     emacsclient
  CCLD     ebrowse
  CCLD     profile
  CC       pop.o
  CCLD     movemail
  CCLD     hexl
  CCLD     update-game-score
  CCLD     make-docfile
make[1]: Leaving directory
`/home/vagrant/git-repositories/3rd-party/emacs/lib-src'
make -C src VCSWITNESS='$(srcdir)/../.git/logs/HEAD' all
make[1]: Entering directory
`/home/vagrant/git-repositories/3rd-party/emacs/src'
  GEN      globals.h
  CC       vm-limit.o
  CC       dispnew.o
  CC       frame.o
  CC       scroll.o
  CC       xdisp.o
  CC       menu.o
  CC       window.o
  CC       charset.o
  CC       coding.o
  CC       category.o
  CC       ccl.o
  CC       character.o
  CC       chartab.o
  CC       bidi.o
  CC       cm.o
  CC       term.o
  CC       terminal.o
  CC       xfaces.o
  CC       dbusbind.o
  CC       emacs.o
  CC       keyboard.o
  CC       macros.o
  CC       keymap.o
  CC       sysdep.o
  CC       buffer.o
  CC       filelock.o
  CC       insdel.o
  CC       marker.o
  CC       minibuf.o
  CC       fileio.o
  CC       dired.o
  CC       cmds.o
  CC       casetab.o
  CC       casefiddle.o
  CC       indent.o
  CC       search.o
  CC       regex.o
  CC       undo.o
  CC       alloc.o
  CC       data.o
  GEN      buildobj.h
  CC       doc.o
  CC       editfns.o
  CC       callint.o
  CC       eval.o
  CC       floatfns.o
  CC       fns.o
  CC       font.o
  CC       print.o
  CC       lread.o
  CC       syntax.o
  CC       unexelf.o
  CC       bytecode.o
  CC       process.o
  CC       gnutls.o
  CC       callproc.o
  CC       region-cache.o
  CC       sound.o
  CC       atimer.o
  CC       doprnt.o
  CC       intervals.o
  CC       textprop.o
  CC       composite.o
  CC       xml.o
  CC       gfilenotify.o
  CC       profiler.o
  CC       decompress.o
  CC       xgselect.o
  CC       terminfo.o
  CC       lastfile.o
  CCLD     temacs
/bin/mkdir -p ../etc
: paxctl -r temacs
: setfattr -n user.pax.flags -v er temacs
make -C ../lisp update-subdirs
make[2]: Entering directory
`/home/vagrant/git-repositories/3rd-party/emacs/lisp'
for file in `find . -type d -print`; do case $file in .*/cedet* | .*/leim*
) ;; *) wins="$wins${wins:+ }$file" ;; esac; done; \
for file in $wins; do \
   ./../build-aux/update-subdirs $file; \
done;
make[2]: Leaving directory
`/home/vagrant/git-repositories/3rd-party/emacs/lisp'
./temacs --batch --load loadup bootstrap
make[1]: *** [bootstrap-emacs] Segmentation fault (core dumped)
make[1]: Leaving directory
`/home/vagrant/git-repositories/3rd-party/emacs/src'
make: *** [src] Error 2
vagrant@vagrant-ubuntu-server-trusty-32:~/git-repositories/3rd-party/emacs/src$
gdb temacs
GNU gdb (Ubuntu 7.7.1-0ubuntu5~14.04.2) 7.7.1
Copyright (C) 2014 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.  Type "show copying"
and "show warranty" for details.
This GDB was configured as "i686-linux-gnu".
Type "show configuration" for configuration details.
For bug reporting instructions, please see:
<http://www.gnu.org/software/gdb/bugs/>.
Find the GDB manual and other documentation resources online at:
<http://www.gnu.org/software/gdb/documentation/>.
For help, type "help".
Type "apropos word" to search for commands related to "word"...
Reading symbols from temacs...done.
warning: File "/home/vagrant/git-repositories/3rd-party/emacs/src/.gdbinit"
auto-loading has been declined by your `auto-load safe-path' set to
"$debugdir:$datadir/auto-load".
To enable execution of this file add
add-auto-load-safe-path
/home/vagrant/git-repositories/3rd-party/emacs/src/.gdbinit
line to your configuration file "/home/vagrant/.gdbinit".
To completely disable this security protection add
set auto-load safe-path /
line to your configuration file "/home/vagrant/.gdbinit".
For more information about this security protection see the
"Auto-loading safe path" section in the GDB manual.  E.g., run from the
shell:
info "(gdb)Auto-loading safe path"
(gdb) run --batch --load loadup bootstrap
Starting program: /home/vagrant/git-repositories/3rd-party/emacs/src/temacs
--batch --load loadup bootstrap
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/i386-linux-gnu/libthread_db.so.1".
process 8435 is executing new program:
/home/vagrant/git-repositories/3rd-party/emacs/src/temacs
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/i386-linux-gnu/libthread_db.so.1".

Program received signal SIGSEGV, Segmentation fault.
__GI___backtrace (array=array@entry=0xbfffedcc, size=size@entry=0) at
../sysdeps/i386/backtrace.c:141
141 ../sysdeps/i386/backtrace.c: No such file or directory.
(gdb) bt
#0  __GI___backtrace (array=array@entry=0xbfffedcc, size=size@entry=0) at
../sysdeps/i386/backtrace.c:141
#1  0x080ed543 in emacs_backtrace (backtrace_limit=backtrace_limit@entry=-1)
at sysdep.c:2177
#2  0x0804f744 in main (argc=<optimized out>, argv=0xbffff6d4) at
emacs.c:887
(gdb)