bug#65640: 30.0.50; segfault when building emacs with native-comp

bug#65640: 30.0.50; segfault when building emacs with native-comp

[StrawberryTea]

Hi. I just set up a fresh install of Gentoo with Clang as my default
compiler. At first, I was trying to compile Emacs with Clang and Emacs
was finding -lgccjit but not finding the libgccjit.h header file. So I
overwrote the compiler Emacs was using to GCC instead and now it
compiles but segfaults when native-compiling some Elisp files.

Build log with Clang (configure error): https://bpa.st/ODFBK
Build log with GCC (segfault): https://0x0.st/Hpbz.txt

Sincerely,
StrawberryTea


In GNU Emacs 30.0.50 (build 1, x86_64-pc-linux-gnu, cairo version
 1.17.8) of 2023-08-30 built on localhost
Repository revision: 8650b3308dd83d6f87ed14562c7d55c8bfde3faf
Repository branch: master
System Description: Gentoo Linux

Configured using:
 'configure --prefix=/usr --build=x86_64-pc-linux-gnu
 --host=x86_64-pc-linux-gnu --mandir=/usr/share/man
 --infodir=/usr/share/info --datadir=/usr/share --sysconfdir=/etc
 --localstatedir=/var/lib --datarootdir=/usr/share
 --disable-silent-rules --docdir=/usr/share/doc/emacs-30.0.9999
 --htmldir=/usr/share/doc/emacs-30.0.9999/html --libdir=/usr/lib64
 --program-suffix=-emacs-30-vcs --includedir=/usr/include/emacs-30-vcs
 --infodir=/usr/share/info/emacs-30-vcs --localstatedir=/var
 --enable-locallisppath=/etc/emacs:/usr/share/emacs/site-lisp
 --without-compress-install --without-hesiod --without-pop
 --with-file-notification=inotify --with-pdumper --enable-acl
 --enable-xattr --with-dbus --with-modules --with-gameuser=:gamestat
 --with-libgmp --without-gpm --without-native-compilation --with-json
 --without-kerberos --without-kerberos5 --with-lcms2 --with-xml2
 --with-mailutils --without-selinux --with-sqlite3 --with-gnutls
 --with-libsystemd --with-threads --with-tree-sitter --without-wide-int
 --with-sound=alsa --with-zlib --with-x --without-pgtk --without-ns
 --without-gconf --without-gsettings --without-toolkit-scroll-bars
 --with-xpm --with-xft --with-cairo --with-harfbuzz --with-libotf
 --with-m17n-flt --with-x-toolkit=no --with-gif --with-jpeg --with-png
 --with-rsvg --with-tiff --with-webp --with-imagemagick
 --with-dumping=pdumper 'CFLAGS=-O3 -march=native -flto=thin -pipe'
 'LDFLAGS=-Wl,-O1 -Wl,--as-needed -Wl,--as-needed''

Configured features:
ACL CAIRO DBUS FREETYPE GIF GLIB GMP GNUTLS HARFBUZZ IMAGEMAGICK JPEG
JSON LCMS2 LIBOTF LIBSYSTEMD LIBXML2 M17N_FLT MODULES NOTIFY INOTIFY
OLDXMENU PDUMPER PNG RSVG SECCOMP SOUND SQLITE3 THREADS TIFF TREE_SITTER
WEBP X11 XDBE XIM XINPUT2 XPM ZLIB

Important settings:
  value of $LANG: C.utf8
  locale-coding-system: utf-8-unix

Major mode: syslog

Minor modes in effect:
  global-evil-surround-mode: t
  evil-surround-mode: t
  eros-mode: t
  midnight-mode: t
  global-wakatime-mode: t
  wakatime-mode: t
  org-roam-db-autosync-mode: t
  pdf-occur-global-minor-mode: t
  eat-eshell-visual-command-mode: t
  eat-eshell-mode: t
  yas-global-mode: t
  yas-minor-mode: t
  diff-hl-flydiff-mode: t
  projectile-mode: t
  save-place-mode: t
  global-so-long-mode: t
  global-git-commit-mode: t
  envrc-global-mode: t
  beacon-mode: t
  vimish-fold-global-mode: t
  vimish-fold-mode: t
  corfu-history-mode: t
  diff-hl-margin-local-mode: t
  diff-hl-margin-mode: t
  diff-hl-mode: t
  recentf-mode: t
  dirvish-override-dired-mode: t
  which-key-mode: t
  savehist-mode: t
  better-jumper-mode: t
  better-jumper-local-mode: t
  vertico-mode: t
  all-the-icons-completion-mode: t
  marginalia-mode: t
  evil-goggles-mode: t
  evil-snipe-override-mode: t
  evil-snipe-mode: t
  evil-snipe-override-local-mode: t
  evil-snipe-local-mode: t
  repeat-mode: t
  restore-point-mode: t
  evil-owl-mode: t
  kill-ring-deindent-mode: t
  aas-global-mode: t
  aas-mode: t
  gcmh-mode: t
  winner-mode: t
  smartparens-global-mode: t
  smartparens-mode: t
  undo-fu-session-global-mode: t
  undo-fu-session-mode: t
  undo-fu-mode: t
  ws-butler-global-mode: t
  editorconfig-mode: t
  corfu-terminal-mode: t
  corfu-popupinfo-mode: t
  global-corfu-mode: t
  corfu-mode: t
  minions-mode: t
  global-yank-indent-mode: t
  xterm-mouse-mode: t
  xclip-mode: t
  persp-mode: t
  dtrt-indent-mode: t
  +popup-mode: t
  override-global-mode: t
  evil-mode: t
  evil-local-mode: t
  general-override-mode: t
  global-eldoc-mode: t
  show-paren-mode: t
  electric-indent-mode: t
  mouse-wheel-mode: t
  tab-bar-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  undelete-frame-mode: t
  buffer-read-only: t
  column-number-mode: t
  line-number-mode: t
  transient-mark-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  abbrev-mode: t

Load-path shadows:
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/home/st/.config/emacs/.local/straight/build-30.0.50/ef-themes/theme-loaddefs hides /home/st/.config/emacs/.local/straight/build-30.0.50/modus-themes/theme-loaddefs
/home/st/.config/emacs/.local/straight/build-30.0.50/cmake-mode/cmake-mode hides /usr/share/emacs/site-lisp/cmake-mode
/home/st/.config/emacs/.local/straight/build-30.0.50/cmake-mode/cmake-mode hides /usr/share/emacs/site-lisp/cmake/cmake-mode
/usr/share/emacs/site-lisp/desktop-entry-mode hides /usr/share/emacs/site-lisp/desktop-file-utils/desktop-entry-mode
/usr/share/emacs/site-lisp/ratpoison hides /usr/share/emacs/site-lisp/ratpoison/ratpoison
/home/st/.config/emacs/.local/straight/build-30.0.50/external-completion/external-completion hides /usr/share/emacs/30.0.50/lisp/external-completion
/home/st/.config/emacs/.local/straight/build-30.0.50/jsonrpc/jsonrpc hides /usr/share/emacs/30.0.50/lisp/jsonrpc
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/home/st/.config/emacs/.local/straight/build-30.0.50/use-package/use-package-bind-key hides /usr/share/emacs/30.0.50/lisp/use-package/use-package-bind-key
/home/st/.config/emacs/.local/straight/build-30.0.50/use-package/use-package-core hides /usr/share/emacs/30.0.50/lisp/use-package/use-package-core
/home/st/.config/emacs/.local/straight/build-30.0.50/use-package/use-package-delight hides /usr/share/emacs/30.0.50/lisp/use-package/use-package-delight
/home/st/.config/emacs/.local/straight/build-30.0.50/use-package/use-package-diminish hides /usr/share/emacs/30.0.50/lisp/use-package/use-package-diminish
/home/st/.config/emacs/.local/straight/build-30.0.50/use-package/use-package-ensure hides /usr/share/emacs/30.0.50/lisp/use-package/use-package-ensure
/home/st/.config/emacs/.local/straight/build-30.0.50/use-package/use-package-jump hides /usr/share/emacs/30.0.50/lisp/use-package/use-package-jump
/home/st/.config/emacs/.local/straight/build-30.0.50/use-package/use-package-lint hides /usr/share/emacs/30.0.50/lisp/use-package/use-package-lint
/home/st/.config/emacs/.local/straight/build-30.0.50/use-package/use-package hides /usr/share/emacs/30.0.50/lisp/use-package/use-package
/home/st/.config/emacs/.local/straight/build-30.0.50/eglot/eglot hides /usr/share/emacs/30.0.50/lisp/progmodes/eglot
/home/st/.config/emacs/.local/straight/build-30.0.50/flymake/flymake hides /usr/share/emacs/30.0.50/lisp/progmodes/flymake
/home/st/.config/emacs/.local/straight/build-30.0.50/project/project hides /usr/share/emacs/30.0.50/lisp/progmodes/project
/home/st/.config/emacs/.local/straight/build-30.0.50/xref/xref hides /usr/share/emacs/30.0.50/lisp/progmodes/xref
/home/st/.config/emacs/.local/straight/build-30.0.50/org/ob-C hides /usr/share/emacs/30.0.50/lisp/org/ob-C
/home/st/.config/emacs/.local/straight/build-30.0.50/org/ob-awk hides /usr/share/emacs/30.0.50/lisp/org/ob-awk
/home/st/.config/emacs/.local/straight/build-30.0.50/org/ob-calc hides /usr/share/emacs/30.0.50/lisp/org/ob-calc
/home/st/.config/emacs/.local/straight/build-30.0.50/org/ob-clojure hides /usr/share/emacs/30.0.50/lisp/org/ob-clojure
/home/st/.config/emacs/.local/straight/build-30.0.50/org/ob-core hides /usr/share/emacs/30.0.50/lisp/org/ob-core
/home/st/.config/emacs/.local/straight/build-30.0.50/org/ob-ditaa hides /usr/share/emacs/30.0.50/lisp/org/ob-ditaa
/home/st/.config/emacs/.local/straight/build-30.0.50/org/ob-dot hides /usr/share/emacs/30.0.50/lisp/org/ob-dot
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/home/st/.config/emacs/.local/straight/build-30.0.50/org/ob-eshell hides /usr/share/emacs/30.0.50/lisp/org/ob-eshell
/home/st/.config/emacs/.local/straight/build-30.0.50/org/ob-exp hides /usr/share/emacs/30.0.50/lisp/org/ob-exp
/home/st/.config/emacs/.local/straight/build-30.0.50/org/ob-forth hides /usr/share/emacs/30.0.50/lisp/org/ob-forth
/home/st/.config/emacs/.local/straight/build-30.0.50/org/ob-gnuplot hides /usr/share/emacs/30.0.50/lisp/org/ob-gnuplot
/home/st/.config/emacs/.local/straight/build-30.0.50/org/ob-haskell hides /usr/share/emacs/30.0.50/lisp/org/ob-haskell
/home/st/.config/emacs/.local/straight/build-30.0.50/org/ob-julia hides /usr/share/emacs/30.0.50/lisp/org/ob-julia
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/home/st/.config/emacs/.local/straight/build-30.0.50/org/ob-python hides /usr/share/emacs/30.0.50/lisp/org/ob-python
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/home/st/.config/emacs/.local/straight/build-30.0.50/org/ob-R hides /usr/share/emacs/30.0.50/lisp/org/ob-R
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/home/st/.config/emacs/.local/straight/build-30.0.50/org/ob-java hides /usr/share/emacs/30.0.50/lisp/org/ob-java
/home/st/.config/emacs/.local/straight/build-30.0.50/org/ob-latex hides /usr/share/emacs/30.0.50/lisp/org/ob-latex
/home/st/.config/emacs/.local/straight/build-30.0.50/org/ob-lua hides /usr/share/emacs/30.0.50/lisp/org/ob-lua
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/home/st/.config/emacs/.local/straight/build-30.0.50/org/ox-latex hides /usr/share/emacs/30.0.50/lisp/org/ox-latex
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bug#65640: 30.0.50; segfault when building emacs with native-comp

[Eli Zaretskii]

> From: StrawberryTea <look@strawberrytea.xyz>
> Date: Wed, 30 Aug 2023 14:38:55 -0500
> 
> 
> Hi. I just set up a fresh install of Gentoo with Clang as my default
> compiler. At first, I was trying to compile Emacs with Clang and Emacs
> was finding -lgccjit but not finding the libgccjit.h header file. So I
> overwrote the compiler Emacs was using to GCC instead and now it
> compiles but segfaults when native-compiling some Elisp files.
> 
> Build log with Clang (configure error): https://bpa.st/ODFBK
> Build log with GCC (segfault): https://0x0.st/Hpbz.txt

First, you apply local patches to the Emacs tree, so you are compiling
code that is not from our Git repository, but some variation of that.

More importantly: it looks like you build Emacs with "-O3 -march=native",
which are not the default compilation switches, and cause GCC to
over-optimize the code.  Please try again without those switches.

If using the default compiler switches doesn't help, please run the
crashing command under GDB, and when it segfaults, produce the
C-level backtrace and post it here.

Please also always post the build logs as plain text or attachments to
your messages, instead of pointing to a URL that could some day go
away, and thus years from now people will be unable to see the log by
reading this discussion.

Thanks.

P.S. Adding Andrea.

bug#65640: 30.0.50; segfault when building emacs with native-comp

[Andrea Corallo]

Eli Zaretskii <eliz@gnu.org> writes:

>> From: StrawberryTea <look@strawberrytea.xyz>
>> Date: Wed, 30 Aug 2023 14:38:55 -0500
>> 
>> 
>> Hi. I just set up a fresh install of Gentoo with Clang as my default
>> compiler. At first, I was trying to compile Emacs with Clang and Emacs
>> was finding -lgccjit but not finding the libgccjit.h header file. So I
>> overwrote the compiler Emacs was using to GCC instead and now it
>> compiles but segfaults when native-compiling some Elisp files.
>> 
>> Build log with Clang (configure error): https://bpa.st/ODFBK
>> Build log with GCC (segfault): https://0x0.st/Hpbz.txt
>
> First, you apply local patches to the Emacs tree, so you are compiling
> code that is not from our Git repository, but some variation of that.
>
> More importantly: it looks like you build Emacs with "-O3 -march=native",
> which are not the default compilation switches, and cause GCC to
> over-optimize the code.  Please try again without those switches.
>
> If using the default compiler switches doesn't help, please run the
> crashing command under GDB, and when it segfaults, produce the
> C-level backtrace and post it here.
>
> Please also always post the build logs as plain text or attachments to
> your messages, instead of pointing to a URL that could some day go
> away, and thus years from now people will be unable to see the log by
> reading this discussion.
>
> Thanks.
>
> P.S. Adding Andrea.

Agree on everything, from this far (and for whatever reason) looks like
the crash is in libgccjit.  So its version might be relevant as well.

Thanks

  Andrea

bug#65640: 30.0.50; segfault when building emacs with native-comp

[LemonBreezes]

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Okay. So I noticed that even though Emacs was running, the native
compiler was segfaulting in the background. So I recompiled Emacs with
GCC and no optimizations nor patches and I still see that native compilation is
segfaulting on org-element.el. I have attached some verbose logs:
https://0x0.st/HpjT.txt

I don't know how to get a backtrace. If I run Emacs with GDB, libgccjit
gives me a segfault in the *Async-native-compile-log* but Emacs itself
does not segfault.

Sincerely,
StrawberryTea

On Thu, Aug 31, 2023, at 2:24 AM, Andrea Corallo wrote:
> Eli Zaretskii <eliz@gnu.org> writes:
> 
> >> From: StrawberryTea <look@strawberrytea.xyz>
> >> Date: Wed, 30 Aug 2023 14:38:55 -0500
> >> 
> >> 
> >> Hi. I just set up a fresh install of Gentoo with Clang as my default
> >> compiler. At first, I was trying to compile Emacs with Clang and Emacs
> >> was finding -lgccjit but not finding the libgccjit.h header file. So I
> >> overwrote the compiler Emacs was using to GCC instead and now it
> >> compiles but segfaults when native-compiling some Elisp files.
> >> 
> >> Build log with Clang (configure error): https://bpa.st/ODFBK
> >> Build log with GCC (segfault): https://0x0.st/Hpbz.txt
> >
> > First, you apply local patches to the Emacs tree, so you are compiling
> > code that is not from our Git repository, but some variation of that.
> >
> > More importantly: it looks like you build Emacs with "-O3 -march=native",
> > which are not the default compilation switches, and cause GCC to
> > over-optimize the code.  Please try again without those switches.
> >
> > If using the default compiler switches doesn't help, please run the
> > crashing command under GDB, and when it segfaults, produce the
> > C-level backtrace and post it here.
> >
> > Please also always post the build logs as plain text or attachments to
> > your messages, instead of pointing to a URL that could some day go
> > away, and thus years from now people will be unable to see the log by
> > reading this discussion.
> >
> > Thanks.
> >
> > P.S. Adding Andrea.
> 
> Agree on everything, from this far (and for whatever reason) looks like
> the crash is in libgccjit.  So its version might be relevant as well.
> 
> Thanks
> 
>   Andrea
> 

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bug#65640: 30.0.50; segfault when building emacs with native-comp

[Eli Zaretskii]

> Date: Fri, 01 Sep 2023 10:05:52 -0500
> From: LemonBreezes <look@strawberrytea.xyz>
> Cc: 65640@debbugs.gnu.org
> 
> Okay. So I noticed that even though Emacs was running, the native
> compiler was segfaulting in the background. So I recompiled Emacs with
> GCC and no optimizations nor patches and I still see that native compilation is
> segfaulting on org-element.el. I have attached some verbose logs:
> https://0x0.st/HpjT.txt
> 
> I don't know how to get a backtrace. If I run Emacs with GDB, libgccjit
> gives me a segfault in the *Async-native-compile-log* but Emacs itself
> does not segfault.

What happens if you compile org-element.el by invoking
emacs-lisp-native-compile?  That is:

  emacs -Q
  C-x C-f lisp/org/org-element.el RET
  M-x emacs-lisp-native-compile RET

Does Emacs crash if you do the above?  If so, run the above under GDB,
and show the backtrace.

Thanks.

bug#65640: 30.0.50; segfault when building emacs with native-comp

[Eli Zaretskii]

> Date: Fri, 01 Sep 2023 11:40:56 -0500
> From: LemonBreezes <look@strawberrytea.xyz>
> Cc: "Andrea Corallo" <acorallo@gnu.org>, 65640@debbugs.gnu.org
> 
> Okay. So I can reproduce it by native-compiling org.el. But instead of Emacs segfaulting, I get the
> following error:
> 
> Debugger entered--Lisp error: (wrong-type-argument
> "/home/st/.config/emacs/.local/straight/repos/org/l..." number-or-marker-p "Segmentation fault")
>   signal(wrong-type-argument ("/home/st/.config/emacs/.local/straight/repos/org/lisp/org.el"
> number-or-marker-p "Segmentation fault"))
>   comp--native-compile("/home/st/.config/emacs/.local/straight/repos/org/l..." nil nil)
>   native-compile("/home/st/.config/emacs/.local/straight/repos/org/l...")
>   emacs-lisp-native-compile()

Looks like Andrea was right: libgccjit is segfaulting on your system,
for some reason.  If some other version of libgccjit is known to work
well on that platform, perhaps install that other version instead of
what you have now.

bug#65640: 30.0.50; segfault when building emacs with native-comp

[LemonBreezes]

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Hi. I updated from the unstable GCC 13.2.1_p20230826 Gentoo package to the live 14.0.0.9999 version of GCC and the issue disappeared. Thank you. :))

On Fri, Sep 1, 2023, at 12:27 PM, Eli Zaretskii wrote:
> > Date: Fri, 01 Sep 2023 11:40:56 -0500
> > From: LemonBreezes <look@strawberrytea.xyz>
> > Cc: "Andrea Corallo" <acorallo@gnu.org>, 65640@debbugs.gnu.org
> > 
> > Okay. So I can reproduce it by native-compiling org.el. But instead of Emacs segfaulting, I get the
> > following error:
> > 
> > Debugger entered--Lisp error: (wrong-type-argument
> > "/home/st/.config/emacs/.local/straight/repos/org/l..." number-or-marker-p "Segmentation fault")
> >   signal(wrong-type-argument ("/home/st/.config/emacs/.local/straight/repos/org/lisp/org.el"
> > number-or-marker-p "Segmentation fault"))
> >   comp--native-compile("/home/st/.config/emacs/.local/straight/repos/org/l..." nil nil)
> >   native-compile("/home/st/.config/emacs/.local/straight/repos/org/l...")
> >   emacs-lisp-native-compile()
> 
> Looks like Andrea was right: libgccjit is segfaulting on your system,
> for some reason.  If some other version of libgccjit is known to work
> well on that platform, perhaps install that other version instead of
> what you have now.
> 

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bug#65640: 30.0.50; segfault when building emacs with native-comp

[Stefan Kangas]

tags 65640 notabug
close 65640
thanks

LemonBreezes <look@strawberrytea.xyz> writes:

> Hi. I updated from the unstable GCC 13.2.1_p20230826 Gentoo package to the live 14.0.0.9999 version of GCC and the issue disappeared. Thank you. :))

Thanks, I'm therefore closing this bug.