bug#28430: 26.0.50; Segfault on unexpected connection loss

bug#28430: 26.0.50; Segfault on unexpected connection loss

[Daniel Kraus]

This bug happens with restclient mode but I suspect it happens
for other packages as well?!

To reproduce:

Start in a process to listen on a port, e.g.
#+BEGIN_SRC sh
nc -l -p 6543
#+END_SRC

Start emacs: `emacs --debug-init -Q`

Load restclient:
#+BEGIN_SRC emacs-lisp
(add-to-list 'load-path "/home/daniel/.emacs.d/elpa/restclient-20170727.825")
(require 'restclient)
#+END_SRC
Open new buffer (e.g. 'test.rest') and `M-x restclient-mode`.
Type:
`GET http://127.0.0.1:6543/`
and then press `C-c C-c`

Switch to the netcat window and Ctrl-C to break up the connection.
Emacs segfaults:
#+BEGIN_QUOTE
Fatal error 11: Segmentation fault
Backtrace:
/usr/bin/emacs[0x50e2bf]
/usr/bin/emacs[0x4f3d02]
/usr/bin/emacs[0x50c5df]
/usr/bin/emacs[0x50c809]
/usr/bin/emacs[0x50c88d]
/usr/lib/libpthread.so.0(+0x11da0)[0x7fccb2d59da0]
/usr/bin/emacs[0x4f8d80]
/usr/bin/emacs[0x5a8d21]
/usr/bin/emacs[0x569d1e]
/usr/bin/emacs[0x5a8c2f]
/usr/bin/emacs[0x5abbc9]
/usr/bin/emacs[0x5b16a2]
/usr/bin/emacs[0x4fe9ae]
/usr/bin/emacs[0x500d9c]
/usr/bin/emacs[0x50289e]
/usr/bin/emacs[0x569c4f]
/usr/bin/emacs[0x4f40c5]
/usr/bin/emacs[0x569bbe]
/usr/bin/emacs[0x4f405d]
/usr/bin/emacs[0x4f8a28]
/usr/bin/emacs[0x4f8d57]
/usr/bin/emacs[0x41645c]
/usr/lib/libc.so.6(__libc_start_main+0xea)[0x7fccb2322f6a]
/usr/bin/emacs[0x4171ea]
fish: “/usr/bin/emacs --debug-init -Q” terminated by signal SIGSEGV (Address boundary error)
#+END_QUOTE



In GNU Emacs 26.0.50 (build 22, x86_64-pc-linux-gnu, GTK+ Version 3.22.19)
 of 2017-09-12 built on matrix
Repository revision: 370e04fbb206c59c6a2251dc54f69c61887f60cc
Windowing system distributor 'The X.Org Foundation', version 11.0.11903000
Recent messages:
Restoring clock data
Loading /home/daniel/.emacs.d/personal/org-clock-save.el (source)...done
When done with this frame, type C-x 5 0
Saving file /home/daniel/org/gtd.org...
Wrote /tmp/.!home!daniel!org!gtd.org.~undo-tree~
Wrote /home/daniel/org/gtd.org
Mark set
Saving file /home/daniel/org/gtd.org...
Wrote /tmp/.!home!daniel!org!gtd.org.~undo-tree~
Wrote /home/daniel/org/gtd.org

Configured using:
 'configure --prefix=/usr --sysconfdir=/etc --libexecdir=/usr/lib
 --localstatedir=/var --mandir=/usr/share/man --with-gameuser=:games
 --with-sound=alsa --with-xft --with-modules --with-x-toolkit=gtk3
 --without-gconf --with-gsettings --without-gpm --without-m17n-flt
 --with-xwidgets --without-compress-install 'CFLAGS=-march=x86-64
 -mtune=generic -O2 -pipe -fstack-protector-strong -fno-plt'
 CPPFLAGS=-D_FORTIFY_SOURCE=2
 LDFLAGS=-Wl,-O1,--sort-common,--as-needed,-z,relro,-z,now'

Configured features:
XPM JPEG TIFF GIF PNG RSVG IMAGEMAGICK SOUND DBUS GSETTINGS NOTIFY ACL
GNUTLS LIBXML2 FREETYPE LIBOTF XFT ZLIB TOOLKIT_SCROLL_BARS GTK3 X11
MODULES XWIDGETS LIBSYSTEMD

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

Major mode: Messages

Minor modes in effect:
  editorconfig-mode: t
  csv-field-index-mode: t
  selected-global-mode: t
  selected-minor-mode: t
  global-undo-tree-mode: t
  undo-tree-mode: t
  yas-global-mode: t
  yas-minor-mode: t
  global-edit-server-edit-mode: t
  frames-only-mode: t
  global-company-mode: t
  company-mode: t
  whole-line-or-region-global-mode: t
  whole-line-or-region-local-mode: t
  back-button-mode: t
  dired-async-mode: t
  beacon-mode: t
  which-key-mode: t
  override-global-mode: t
  magit-auto-revert-mode: t
  global-git-commit-mode: t
  diff-auto-refine-mode: t
  global-flycheck-mode: t
  which-function-mode: t
  helm-mode: t
  helm-descbinds-mode: t
  helm-autoresize-mode: t
  async-bytecomp-package-mode: t
  winner-mode: t
  global-anzu-mode: t
  anzu-mode: t
  projectile-mode: t
  volatile-highlights-mode: t
  global-hl-line-mode: t
  savehist-mode: t
  save-place-mode: t
  show-smartparens-global-mode: t
  global-auto-revert-mode: t
  delete-selection-mode: t
  prelude-global-mode: t
  prelude-mode: t
  shell-dirtrack-mode: t
  recentf-mode: t
  cl-old-struct-compat-mode: t
  tooltip-mode: t
  global-eldoc-mode: t
  electric-indent-mode: t
  mouse-wheel-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  buffer-read-only: t
  size-indication-mode: t
  column-number-mode: t
  line-number-mode: t
  transient-mark-mode: t

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/home/daniel/.emacs.d/elpa/org-plus-contrib-20170911/ob-maxima hides /usr/share/emacs/26.0.50/lisp/org/ob-maxima
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/home/daniel/.emacs.d/elpa/org-plus-contrib-20170911/org-attach hides /usr/share/emacs/26.0.50/lisp/org/org-attach
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/home/daniel/.emacs.d/elpa/org-plus-contrib-20170911/org hides /usr/share/emacs/26.0.50/lisp/org/org
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Features:
(shadow face-remap emacsbug helm-command helm-x-files helm-for-files
helm-external diary-lib diary-loaddefs cal-iso org-eldoc org-indent
cap-words superword subword org-bullets org-rmail org-mhe org-irc
org-info org-gnus org-docview org-bibtex bibtex org-bbdb org-w3m
editorconfig-core editorconfig-core-handle editorconfig-fnmatch
company-yasnippet smart-mode-line-powerline-theme keychain-environment
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csv-mode iedit iedit-lib web-mode-expansions web-mode disp-table
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Memory information:
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<#secure method=pgpmime mode=sign>

bug#28430: 26.0.50; Segfault on unexpected connection loss

[Eli Zaretskii]

> From: Daniel Kraus <daniel@kraus.my>
> Date: Tue, 12 Sep 2017 13:41:20 +0800
> 
> This bug happens with restclient mode but I suspect it happens
> for other packages as well?!
> 
> To reproduce:
> 
> Start in a process to listen on a port, e.g.
> #+BEGIN_SRC sh
> nc -l -p 6543
> #+END_SRC
> 
> Start emacs: `emacs --debug-init -Q`
> 
> Load restclient:
> #+BEGIN_SRC emacs-lisp
> (add-to-list 'load-path "/home/daniel/.emacs.d/elpa/restclient-20170727.825")
> (require 'restclient)
> #+END_SRC
> Open new buffer (e.g. 'test.rest') and `M-x restclient-mode`.
> Type:
> `GET http://127.0.0.1:6543/`
> and then press `C-c C-c`
> 
> Switch to the netcat window and Ctrl-C to break up the connection.
> Emacs segfaults:
> #+BEGIN_QUOTE
> Fatal error 11: Segmentation fault

Can you please run this under GDB, and when Emacs segfaults, produce
the C backtrace and post it here?

Thanks.

bug#28430: 26.0.50; Segfault on unexpected connection loss

[Daniel Kraus]

[-- Attachment #1: Type: text/plain, Size: 3178 bytes --]

Hi!

Eli Zaretskii <eliz@gnu.org> writes:

>> From: Daniel Kraus <daniel@kraus.my>
>> Date: Tue, 12 Sep 2017 13:41:20 +0800
>>
>> This bug happens with restclient mode but I suspect it happens
>> for other packages as well?!
>>
>> To reproduce:
>>
>> Start in a process to listen on a port, e.g.
>> #+BEGIN_SRC sh
>> nc -l -p 6543
>> #+END_SRC
>>
>> Start emacs: `emacs --debug-init -Q`
>>
>> Load restclient:
>> #+BEGIN_SRC emacs-lisp
>> (add-to-list 'load-path "/home/daniel/.emacs.d/elpa/restclient-20170727.825")
>> (require 'restclient)
>> #+END_SRC
>> Open new buffer (e.g. 'test.rest') and `M-x restclient-mode`.
>> Type:
>> `GET http://127.0.0.1:6543/`
>> and then press `C-c C-c`
>>
>> Switch to the netcat window and Ctrl-C to break up the connection.
>> Emacs segfaults:
>> #+BEGIN_QUOTE
>> Fatal error 11: Segmentation fault
>
> Can you please run this under GDB, and when Emacs segfaults, produce
> the C backtrace and post it here?

--cut--
#0  0x00007ffff017bc40 in raise () at /usr/lib/libpthread.so.0
#1  0x0000000000597ab9 in terminate_due_to_signal (sig=6, backtrace_limit=2147483647) at emacs.c:394
#2  0x0000000000632a74 in die (msg=0x778761 "CONSP (data)", file=0x7786d1 "keyboard.c", line=999) at alloc.c:7419
#3  0x000000000059c3e1 in cmd_error_internal (data=..., context=0x798c6c "error in process sentinel: ") at keyboard.c:999
#4  0x00000000006c5edd in exec_sentinel_error_handler (error_val=...) at process.c:7105
#5  0x0000000000657d51 in internal_condition_case_1 (bfun=0x6c2b0d <read_process_output_call>, arg=..., handlers=..., hfun=0x6c5ebe <exec_sentinel_error_handler>) at eval.c:1352
#6  0x00000000006c609c in exec_sentinel (proc=..., reason=...) at process.c:7158
#7  0x00000000006c6303 in status_notify (deleting_process=0x0, wait_proc=0x0) at process.c:7260
#8  0x00000000006c1353 in wait_reading_process_output (time_limit=30, nsecs=0, read_kbd=-1, do_display=true, wait_for_cell=..., wait_proc=0x0, just_wait_proc=0) at process.c:5199
#9  0x00000000004285e6 in sit_for (timeout=..., reading=true, display_option=1) at dispnew.c:5763
#10 0x00000000005a1080 in read_char (commandflag=1, map=..., prev_event=..., used_mouse_menu=0x7fffffffe2a1, end_time=0x0) at keyboard.c:2724
#11 0x00000000005b0ffd in read_key_sequence (keybuf=0x7fffffffe440, bufsize=30, prompt=..., dont_downcase_last=false, can_return_switch_frame=true, fix_current_buffer=true, prevent_redisplay=false) at keyboard.c:9151
#12 0x000000000059d045 in command_loop_1 () at keyboard.c:1372
#13 0x0000000000657c85 in internal_condition_case (bfun=0x59cbe3 <command_loop_1>, handlers=..., hfun=0x59c1c7 <cmd_error>) at eval.c:1332
#14 0x000000000059c7bd in command_loop_2 (ignore=...) at keyboard.c:1114
#15 0x000000000065712e in internal_catch (tag=..., func=0x59c790 <command_loop_2>, arg=...) at eval.c:1097
#16 0x000000000059c75b in command_loop () at keyboard.c:1093
#17 0x000000000059bcb1 in recursive_edit_1 () at keyboard.c:699
#18 0x000000000059bea6 in Frecursive_edit () at keyboard.c:770
#19 0x000000000059988d in main (argc=2, argv=0x7fffffffe898) at emacs.c:1709
--cut--

Let me know if you need more info or I can do something else to help.

Thanks,
  Daniel

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bug#28430: 26.0.50; Segfault on unexpected connection loss

[Eli Zaretskii]

> From: Daniel Kraus <daniel@kraus.my>
> Cc: 28430@debbugs.gnu.org
> Date: Wed, 13 Sep 2017 17:12:14 +0800
> 
> >> Open new buffer (e.g. 'test.rest') and `M-x restclient-mode`.
> >> Type:
> >> `GET http://127.0.0.1:6543/`
> >> and then press `C-c C-c`
> >>
> >> Switch to the netcat window and Ctrl-C to break up the connection.
> >> Emacs segfaults:
> >> #+BEGIN_QUOTE
> >> Fatal error 11: Segmentation fault
> >
> > Can you please run this under GDB, and when Emacs segfaults, produce
> > the C backtrace and post it here?
> 
> --cut--
> #0  0x00007ffff017bc40 in raise () at /usr/lib/libpthread.so.0
> #1  0x0000000000597ab9 in terminate_due_to_signal (sig=6, backtrace_limit=2147483647) at emacs.c:394
> #2  0x0000000000632a74 in die (msg=0x778761 "CONSP (data)", file=0x7786d1 "keyboard.c", line=999) at alloc.c:7419
> #3  0x000000000059c3e1 in cmd_error_internal (data=..., context=0x798c6c "error in process sentinel: ") at keyboard.c:999
> #4  0x00000000006c5edd in exec_sentinel_error_handler (error_val=...) at process.c:7105
> #5  0x0000000000657d51 in internal_condition_case_1 (bfun=0x6c2b0d <read_process_output_call>, arg=..., handlers=..., hfun=0x6c5ebe <exec_sentinel_error_handler>) at eval.c:1352
> #6  0x00000000006c609c in exec_sentinel (proc=..., reason=...) at process.c:7158
> #7  0x00000000006c6303 in status_notify (deleting_process=0x0, wait_proc=0x0) at process.c:7260

Thanks.  This seems to be a slightly different problem: the signal
here is 6 (SIGABRT), not SIGSEGV.

In any case, can you show what these GDB commands produce, after the
crash is triggered, and you wind up in 'raise'?

 (gdb) frame 4
 (gdb) pp error_val

After "frame 4", you should be in this function:

   #4  0x00000000006c5edd in exec_sentinel_error_handler (error_val=...) at process.c:7105

If not, adjust the argument 4 as needed.

bug#28430: 26.0.50; Segfault on unexpected connection loss

[Daniel Kraus]

Eli Zaretskii <eliz@gnu.org> writes:

>> From: Daniel Kraus <daniel@kraus.my>
>> Cc: 28430@debbugs.gnu.org
>> Date: Wed, 13 Sep 2017 17:12:14 +0800
>>
>> >> Open new buffer (e.g. 'test.rest') and `M-x restclient-mode`.
>> >> Type:
>> >> `GET http://127.0.0.1:6543/`
>> >> and then press `C-c C-c`
>> >>
>> >> Switch to the netcat window and Ctrl-C to break up the connection.
>> >> Emacs segfaults:
>> >> #+BEGIN_QUOTE
>> >> Fatal error 11: Segmentation fault
>> >
>> > Can you please run this under GDB, and when Emacs segfaults, produce
>> > the C backtrace and post it here?
>>
>> --cut--
>> #0  0x00007ffff017bc40 in raise () at /usr/lib/libpthread.so.0
>> #1  0x0000000000597ab9 in terminate_due_to_signal (sig=6, backtrace_limit=2147483647) at emacs.c:394
>> #2  0x0000000000632a74 in die (msg=0x778761 "CONSP (data)", file=0x7786d1 "keyboard.c", line=999) at alloc.c:7419
>> #3  0x000000000059c3e1 in cmd_error_internal (data=..., context=0x798c6c "error in process sentinel: ") at keyboard.c:999
>> #4  0x00000000006c5edd in exec_sentinel_error_handler (error_val=...) at process.c:7105
>> #5  0x0000000000657d51 in internal_condition_case_1 (bfun=0x6c2b0d <read_process_output_call>, arg=..., handlers=..., hfun=0x6c5ebe <exec_sentinel_error_handler>) at eval.c:1352
>> #6  0x00000000006c609c in exec_sentinel (proc=..., reason=...) at process.c:7158
>> #7  0x00000000006c6303 in status_notify (deleting_process=0x0, wait_proc=0x0) at process.c:7260
>
> Thanks.  This seems to be a slightly different problem: the signal
> here is 6 (SIGABRT), not SIGSEGV.

Before I had Emacs compiled with compiler optimisations and stripped debug symbols.. maybe that's why?


> In any case, can you show what these GDB commands produce, after the
> crash is triggered, and you wind up in 'raise'?
>
>  (gdb) frame 4
>  (gdb) pp error_val
>
> After "frame 4", you should be in this function:
>
>    #4  0x00000000006c5edd in exec_sentinel_error_handler (error_val=...) at process.c:7105
>
> If not, adjust the argument 4 as needed.

Hmm, not sure that's what you're looking for.
`pp` gave `Undefined command`. I started gdb from another Emacs instance
like described in the DEBUG document if that matters.

--cut--

(gdb) r
Starting program: /home/daniel/repos/emacs-git/src/emacs-git/src/bootstrap-emacs -Q
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/usr/lib/libthread_db.so.1".
[New Thread 0x7fffe5694700 (LWP 9879)]
[New Thread 0x7fffdffff700 (LWP 9880)]
[New Thread 0x7fffdf670700 (LWP 9881)]
[New Thread 0x7fffe402ca40 (LWP 10179)]
[Thread 0x7fffe402ca40 (LWP 10179) exited]

Thread 1 "bootstrap-emacs" received signal SIGABRT, Aborted.
0x00007ffff017bc40 in raise () from /usr/lib/libpthread.so.0
(gdb) frame 4
#4  0x00000000006c5edd in exec_sentinel_error_handler (error_val=...) at process.c:7105
7105	  cmd_error_internal (error_val, "error in process sentinel: ");
(gdb) pp error_val
Undefined command: "pp".  Try "help".
(gdb) print error_val
$1 = {i = 0}

--cut--

Let me know if/how I should further investigate.

Thanks,
  Daniel

bug#28430: 26.0.50; Segfault on unexpected connection loss

[Eli Zaretskii]

> From: Daniel Kraus <daniel@kraus.my>
> Cc: 28430@debbugs.gnu.org
> Date: Thu, 14 Sep 2017 10:27:08 +0800
> 
> >  (gdb) frame 4
> >  (gdb) pp error_val
> >
> > After "frame 4", you should be in this function:
> >
> >    #4  0x00000000006c5edd in exec_sentinel_error_handler (error_val=...) at process.c:7105
> >
> > If not, adjust the argument 4 as needed.
> 
> Hmm, not sure that's what you're looking for.
> `pp` gave `Undefined command`. I started gdb from another Emacs instance
> like described in the DEBUG document if that matters.

Sorry, you need to source .gdbinit file for "pp" to work.

bug#28430: 26.0.50; Segfault on unexpected connection loss

[Daniel Kraus]

[-- Attachment #1: Type: text/plain, Size: 3864 bytes --]

Hi!

Eli Zaretskii <eliz@gnu.org> writes:

>> From: Daniel Kraus <daniel@kraus.my>
>> Cc: 28430@debbugs.gnu.org
>> Date: Thu, 14 Sep 2017 10:27:08 +0800
>>
>> >  (gdb) frame 4
>> >  (gdb) pp error_val
>> >
>> > After "frame 4", you should be in this function:
>> >
>> >    #4  0x00000000006c5edd in exec_sentinel_error_handler (error_val=...) at process.c:7105
>> >
>> > If not, adjust the argument 4 as needed.
>
> Sorry, you need to source .gdbinit file for "pp" to work.

Ups, sorry. Thought emacs would do that for me.

Here (with backtrace again just to be sure since error_val seems empty):

--cut--

(gdb) r
Starting program: /home/daniel/repos/emacs-git/src/emacs-git/src/bootstrap-emacs -Q
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/usr/lib/libthread_db.so.1".
[New Thread 0x7fffe5693700 (LWP 13037)]
[New Thread 0x7fffdffff700 (LWP 13038)]
[New Thread 0x7fffdf670700 (LWP 13039)]
[New Thread 0x7fffdea4ca40 (LWP 13395)]
[Thread 0x7fffdea4ca40 (LWP 13395) exited]

Thread 1 "bootstrap-emacs" received signal SIGABRT, Aborted.
0x00007ffff017ac40 in raise () from /usr/lib/libpthread.so.0
(gdb) source .gdbinit
SIGINT is used by the debugger.
Are you sure you want to change it? (y or n) [answered Y; input not from terminal]
DISPLAY = :0
TERM = dumb
Breakpoint 1 at 0x5979ca: file emacs.c, line 363.
Temporary breakpoint 2 at 0x5c3fe7: file sysdep.c, line 1025.
(gdb) frame 4
#4  0x00000000006c5edd in exec_sentinel_error_handler (error_val=XIL(0)) at process.c:7105
7105	  cmd_error_internal (error_val, "error in process sentinel: ");
(gdb) pp error_val
(gdb) bt
#0  0x00007ffff017ac40 in raise () at /usr/lib/libpthread.so.0
#1  0x0000000000597ab9 in terminate_due_to_signal (sig=6, backtrace_limit=2147483647) at emacs.c:394
#2  0x0000000000632a74 in die (msg=0x778761 "CONSP (data)", file=0x7786d1 "keyboard.c", line=999) at alloc.c:7419
#3  0x000000000059c3e1 in cmd_error_internal (data=XIL(0), context=0x798c6c "error in process sentinel: ") at keyboard.c:999
#4  0x00000000006c5edd in exec_sentinel_error_handler (error_val=XIL(0)) at process.c:7105
#5  0x0000000000657d51 in internal_condition_case_1 (bfun=0x6c2b0d <read_process_output_call>, arg=XIL(0x3198673), handlers=XIL(0x51f0), hfun=0x6c5ebe <exec_sentinel_error_handler>) at eval.c:1352
#6  0x00000000006c609c in exec_sentinel (proc=XIL(0x17e0c65), reason=XIL(0x30c5004)) at process.c:7158
#7  0x00000000006c6303 in status_notify (deleting_process=0x0, wait_proc=0x0) at process.c:7260
#8  0x00000000006c1353 in wait_reading_process_output (time_limit=30, nsecs=0, read_kbd=-1, do_display=true, wait_for_cell=XIL(0), wait_proc=0x0, just_wait_proc=0) at process.c:5199
#9  0x00000000004285e6 in sit_for (timeout=make_number(30), reading=true, display_option=1) at dispnew.c:5763
#10 0x00000000005a1080 in read_char (commandflag=1, map=XIL(0x3199cd3), prev_event=XIL(0), used_mouse_menu=0x7fffffffe2b1, end_time=0x0) at keyboard.c:2724
#11 0x00000000005b0ffd in read_key_sequence (keybuf=0x7fffffffe450, bufsize=30, prompt=XIL(0), dont_downcase_last=false, can_return_switch_frame=true, fix_current_buffer=true, prevent_redisplay=false) at keyboard.c:9151
#12 0x000000000059d045 in command_loop_1 () at keyboard.c:1372
#13 0x0000000000657c85 in internal_condition_case (bfun=0x59cbe3 <command_loop_1>, handlers=XIL(0x51f0), hfun=0x59c1c7 <cmd_error>) at eval.c:1332
#14 0x000000000059c7bd in command_loop_2 (ignore=XIL(0)) at keyboard.c:1114
#15 0x000000000065712e in internal_catch (tag=XIL(0xc630), func=0x59c790 <command_loop_2>, arg=XIL(0)) at eval.c:1097
#16 0x000000000059c75b in command_loop () at keyboard.c:1093
#17 0x000000000059bcb1 in recursive_edit_1 () at keyboard.c:699
#18 0x000000000059bea6 in Frecursive_edit () at keyboard.c:770
#19 0x000000000059988d in main (argc=2, argv=0x7fffffffe8a8) at emacs.c:1709

--cut--

Thanks,
  Daniel

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bug#28430: 26.0.50; Segfault on unexpected connection loss

[Eli Zaretskii]

> From: Daniel Kraus <daniel@kraus.my>
> Cc: 28430@debbugs.gnu.org
> Date: Thu, 14 Sep 2017 12:56:46 +0800
> 
> >> >  (gdb) frame 4
> >> >  (gdb) pp error_val
> >> >
> >> > After "frame 4", you should be in this function:
> >> >
> >> >    #4  0x00000000006c5edd in exec_sentinel_error_handler (error_val=...) at process.c:7105
> >> >
> >> > If not, adjust the argument 4 as needed.
> >
> > Sorry, you need to source .gdbinit file for "pp" to work.
> 
> Ups, sorry. Thought emacs would do that for me.
> 
> Here (with backtrace again just to be sure since error_val seems empty):
> 
> --cut--
> 
> (gdb) r
> Starting program: /home/daniel/repos/emacs-git/src/emacs-git/src/bootstrap-emacs -Q
> [Thread debugging using libthread_db enabled]
> Using host libthread_db library "/usr/lib/libthread_db.so.1".
> [New Thread 0x7fffe5693700 (LWP 13037)]
> [New Thread 0x7fffdffff700 (LWP 13038)]
> [New Thread 0x7fffdf670700 (LWP 13039)]
> [New Thread 0x7fffdea4ca40 (LWP 13395)]
> [Thread 0x7fffdea4ca40 (LWP 13395) exited]
> 
> Thread 1 "bootstrap-emacs" received signal SIGABRT, Aborted.
> 0x00007ffff017ac40 in raise () from /usr/lib/libpthread.so.0
> (gdb) source .gdbinit
> SIGINT is used by the debugger.
> Are you sure you want to change it? (y or n) [answered Y; input not from terminal]
> DISPLAY = :0
> TERM = dumb
> Breakpoint 1 at 0x5979ca: file emacs.c, line 363.
> Temporary breakpoint 2 at 0x5c3fe7: file sysdep.c, line 1025.
> (gdb) frame 4
> #4  0x00000000006c5edd in exec_sentinel_error_handler (error_val=XIL(0)) at process.c:7105
> 7105	  cmd_error_internal (error_val, "error in process sentinel: ");
> (gdb) pp error_val
> (gdb) bt
> #0  0x00007ffff017ac40 in raise () at /usr/lib/libpthread.so.0
> #1  0x0000000000597ab9 in terminate_due_to_signal (sig=6, backtrace_limit=2147483647) at emacs.c:394
> #2  0x0000000000632a74 in die (msg=0x778761 "CONSP (data)", file=0x7786d1 "keyboard.c", line=999) at alloc.c:7419
> #3  0x000000000059c3e1 in cmd_error_internal (data=XIL(0), context=0x798c6c "error in process sentinel: ") at keyboard.c:999
> #4  0x00000000006c5edd in exec_sentinel_error_handler (error_val=XIL(0)) at process.c:7105

Thanks.  I think I fixed this, please try the current master.

bug#28430: 26.0.50; Segfault on unexpected connection loss

[Daniel Kraus]

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Hi!

Eli Zaretskii <eliz@gnu.org> writes:

> Thanks.  I think I fixed this, please try the current master.

Jep, works in master.

Does not crash anymore and the minibuffer shows:

--cut--
HTTP GET http://127.0.0.1:6543 Headers:[nil] Body:[]
Contacting host: 127.0.0.1:6543
error in process sentinel: peculiar error [2 times]
--cut--

Guess a nicer error message is a problem from restclient.el then.

Thanks for the fast fix.
-Daniel

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bug#28430: 26.0.50; Segfault on unexpected connection loss

[Eli Zaretskii]

> From: Daniel Kraus <daniel@kraus.my>
> Cc: 28430@debbugs.gnu.org
> Date: Fri, 15 Sep 2017 21:51:36 +0800
> 
> Eli Zaretskii <eliz@gnu.org> writes:
> 
> > Thanks.  I think I fixed this, please try the current master.
> 
> Jep, works in master.
> 
> Does not crash anymore and the minibuffer shows:
> 
> --cut--
> HTTP GET http://127.0.0.1:6543 Headers:[nil] Body:[]
> Contacting host: 127.0.0.1:6543
> error in process sentinel: peculiar error [2 times]
> --cut--

Great, I will close the bug, then.

> Guess a nicer error message is a problem from restclient.el then.

Yes, I think so.

> Thanks for the fast fix.

Thanks for a simple reproducer and clear backtrace data.