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bug#15475: 24.3.50; race condition in x_frame_rehighlight


From: Jan Djärv
Subject: bug#15475: 24.3.50; race condition in x_frame_rehighlight
Date: Sun, 29 Sep 2013 12:22:41 +0200

Hello.

I've checked in a fix, please try it.

Thanks,

        Jan D.

28 sep 2013 kl. 01:47 skrev Andreas Politz <address@hidden>:

> 
> There is a race condition in x_frame_rehighlight regarding input
> redirection, triggering a null-pointer access.  This kinds of
> errors are usually difficult to reproduce.  I used the following
> code, while simultaneously changing focus rapidly via the
> window-manager.
> 
> (defun fn (&optional parms)
>  (let* ((frame (make-frame parms)))
>    (sit-for 1e-100)
>    (redirect-frame-focus (selected-frame) frame)
>    frame))
> 
> (while t
>  (let ((f1 (fn
>            '((width . 20)
>              (height . 30))))
>       (f2 (fn
>            '((width . 20)
>              (height . 30)
>              (top . 400)))))
>    (sleep-for (/ (float (random 1000)) 5000))
>    (delete-other-frames)))
> 
> Take a look at this part of the attached back-trace.
> 
> #0  0x00000000004f9b0e in frame_highlight (f=0x132b510) at xterm.c:3204
> #4  0x00000000004fa4ae in x_detect_focus_change (dpyinfo=0x15ba800, 
> frame=0x11c7e68, 
>    event=0x7fffffffb300, bufp=0x7fffffffae50) at xterm.c:3522
> #14 0x00000000004ff413 in XTread_socket (...) at xterm.c:7066
> #19 0x00000000005409e7 in unblock_input () at keyboard.c:7116
> #20 0x0000000000503f82 in x_free_frame_resources (f=0x132b510) at xterm.c:9383
> #21 0x0000000000503fbf in x_destroy_window (f=0x132b510) at xterm.c:9397
> #22 0x00000000004274b7 in delete_frame (frame=20100373, force=12634498) at 
> frame.c:1362
> #23 0x000000000042784e in Fdelete_frame (frame=20100373, force=12634498) at 
> frame.c:1495
> 
> Note that the freed frame in #20 is the same as the one about to
> be highlighted in #0.  delete_frame would later execute
> 
>    f->terminal = 0;             /* Now the frame is dead.  */
> 
> but won't, since x_destroy_window has not returned yet.  But
> x_free_frame_resources has executed
> 
>    f->output_data.x = NULL;
> 
> , so FRAME_LIVE_P(f) is still true, but FRAME_X_DISPLAY is no
> good at this moment.  Then in x_frame_rehighlight the deleted
> frame becomes the x_highlight_frame.
> 
> 
> (gdb) p /x dpyinfo->x_focus_frame
> $30 = 0x11c7e68
> (gdb) p /x dpyinfo->x_highlight_frame 
> $27 = 0x132b510
> (gdb) pp dpyinfo->x_focus_frame.focus_frame
> #<frame address@hidden 0x132b510>
> (gdb) p /x dpyinfo->x_highlight_frame.output_data.x
> $36 = 0x0
> (gdb) p /x dpyinfo->x_highlight_frame.terminal
> $37 = 0x110e398
> 
> The second if condition is false (FRAME_LIVE_P) and
> frame_highlight gets called with the halfway deleted frame, calls
> FRAME_X_DISPLAY and that's the end.
> 
> -ap
> 
> <gdb.log>
> 
> 
> In GNU Emacs 24.3.50.4 (x86_64-unknown-linux-gnu, GTK+ Version 2.20.1)
> of 2013-09-27 on luca
> Bzr revision: 114421 address@hidden
> Windowing system distributor `The X.Org Foundation', version 11.0.10707000
> System Description:   Debian GNU/Linux 6.0.7 (squeeze)
> 
> Important settings:
>  value of $LC_COLLATE: C
>  value of $LC_MESSAGES: C
>  value of $LANG: de_DE.UTF-8
>  locale-coding-system: utf-8-unix
>  default enable-multibyte-characters: t
> 
> Major mode: Emacs-Lisp
> 
> Minor modes in effect:
>  workgroups-mode: t
>  desktop-save-mode: t
>  mimo-mode: t
>  ispell-track-input-method: t
>  recentf-mode: t
>  show-paren-mode: t
>  window-numbering-mode: t
>  shell-dirtrack-mode: t
>  scroll-other-window-mode: t
>  savehist-mode: t
>  ekey-mode: t
>  winner-mode: t
>  eldoc-mode: t
>  tooltip-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
>  column-number-mode: t
>  line-number-mode: t
>  transient-mark-mode: t
> 
> Recent input:
> i f SPC c o n d i M-/ SPC i s SPC f a l s e , SPC d 
> u e SPC t o SPC M-h M-h DEL DEL SPC ( F R A M-/ M-/ 
> M-/ M-/ ) SPC a n d SPC f r a m e M-/ M-/ M-h M-h h 
> i M-/ SPC g e t s SPC c a l l e d SPC w i t h SPC M-q 
> SPC t h e M-h a SPC f r a m e M-b DEL DEL C-p C-p C-p 
> SPC < = = <backspace> <backspace> - - C-b C-b C-b C-k 
> C-p C-p C-p C-n C-n C-n C-n C-n C-n M-f SPC d <backspace> 
> M-SPC M-f C-p C-p C-p C-j C-y C-y C-p C-n C-n C-k M-f 
> C-e C-n SPC M-b t h e SPC d e l e t e d SPC M-f , SPC 
> c a l l s SPC C-x o C-u C-SPC C-SPC C-SPC C-c i f r 
> M-p <return> C-s x _ C-s C-M-d C-M-SPC M-w C-x o C-y 
> SPC a n d SPC M-q SPC t h a t ' s SPC t h e SPC e n 
> d . C-x o C-x o M-q C-x o C-x b C-s C-s <return> M-< 
> C-x C-w / t m p / g <backspace> <return> y y C-x o 
> C-p M-f SPC h a l f w a y M-q C-n C-l C-j C-j - a p 
> C-x C-w b u g <return> C-x h C-g M-x i s p e l l <return> 
> a 0 a a a 1 a a a a a a a a a a C-x C-s C-x h M-w M-x 
> r e p o r t - e m <tab> b u <tab> <return>
> 
> Recent messages:
> Mark set [2 times]
> Quit
> Spell-checking bug using aspell with en dictionary...done
> Saving file /tmp/bug...
> Wrote /tmp/bug
> Mark set [2 times]
> Saved text until "RAME_X_DISPLAY and that's the end.
> 
> -ap
> "
> 
> Load-path shadows:
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> 
> Features:
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> epg-config mm-view mml-smime smime dig mailcap emacsbug sendmail ispell
> hi-lock ibuf-ext align dired-aux make-mode debug haskell-font-lock
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> reftex-miscellaneous-configurations-customizations
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> preview-customizations preview-latex-customizations
> preview-appearance-customizations TeX-parse-customizations
> TeX-file-customizations TeX-command-customizations
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> haskell-customizations c-customizations asm-customizations
> multimedia-customizations image-customizations pcase help-customizations
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