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From: martin rudalics <rudalics@gmx.at>
To: Michael Welsh Duggan <mwd@cert.org>
Cc: "mwd@md5i.com" <mwd@md5i.com>,
	"schwab@linux-m68k.org" <schwab@linux-m68k.org>,
	"47244@debbugs.gnu.org" <47244@debbugs.gnu.org>
Subject: bug#47244: 28.0.50; SIGSEGV in long-runnning Emacs
Date: Tue, 30 Mar 2021 18:52:15 +0200	[thread overview]
Message-ID: <b2b85b4b-c250-87c1-33a0-c1f5b18b9f1c@gmx.at> (raw)
In-Reply-To: <y2tdef1rbwn0oc.fsf@lx-birch.ad.sei.cmu.edu>

[-- Attachment #1: Type: text/plain, Size: 207 bytes --]

 >> Are the buffer names the same as last time?
 >
 > Yes.

It all sounds so easily reproducible and I have no idea where to start.
Please bear with me and run with the attached from now on.

Thanks, martin

[-- Warning: decoded text below may be mangled, UTF-8 assumed --]
[-- Attachment #2: selected_window_contents.diff --]
[-- Type: text/x-patch; name="selected_window_contents.diff", Size: 5336 bytes --]

diff --git a/src/buffer.c b/src/buffer.c
index 8e33162989..9ad1e1d4d8 100644
--- a/src/buffer.c
+++ b/src/buffer.c
@@ -1991,6 +1991,8 @@ DEFUN ("kill-buffer", Fkill_buffer, Skill_buffer, 0, 1, "bKill buffer: ",
 
   run_buffer_list_update_hook (b);
 
+  eassert (BUFFER_LIVE_P (XBUFFER (XWINDOW (selected_window)->contents)));
+
   return Qt;
 }
 \f
@@ -2151,6 +2153,9 @@ set_buffer_internal_1 (register struct buffer *b)
 
   BUFFER_CHECK_INDIRECTION (b);
 
+  if (!BUFFER_LIVE_P (b))
+    error ("Selecting deleted buffer");
+
   old_buf = current_buffer;
   current_buffer = b;
   last_known_column_point = -1;   /* Invalidate indentation cache.  */
diff --git a/src/window.c b/src/window.c
index eb16e2a433..8cea0af8ab 100644
--- a/src/window.c
+++ b/src/window.c
@@ -307,7 +307,11 @@ wset_buffer (struct window *w, Lisp_Object val)
   if (BUFFERP (val))
     /* Make sure that we do not assign the buffer
        to an internal window.  */
-    eassert (MARKERP (w->start) && MARKERP (w->pointm));
+    {
+      eassert (BUFFER_LIVE_P (XBUFFER (val)));
+      eassert (MARKERP (w->start) && MARKERP (w->pointm));
+    }
+
   w->contents = val;
   adjust_window_count (w, 1);
 }
@@ -315,6 +319,7 @@ wset_buffer (struct window *w, Lisp_Object val)
 static void
 wset_old_buffer (struct window *w, Lisp_Object val)
 {
+  eassert (BUFFER_LIVE_P (XBUFFER (val)));
   w->old_buffer = val;
 }
 
@@ -594,6 +599,8 @@ select_window_1 (Lisp_Object window, bool inhibit_point_swap)
 
   selected_window = window;
 
+  eassert (BUFFER_LIVE_P (XBUFFER (XWINDOW (selected_window)->contents)));
+
   /* Go to the point recorded in the window.
      This is important when the buffer is in more
      than one window.  It also matters when
@@ -3411,6 +3418,8 @@ DEFUN ("delete-other-windows-internal", Fdelete_other_windows_internal,
 replace_buffer_in_windows (Lisp_Object buffer)
 {
   call1 (Qreplace_buffer_in_windows, buffer);
+
+  eassert (BUFFER_LIVE_P (XBUFFER (XWINDOW (selected_window)->contents)));
 }
 
 /* If BUFFER is shown in a window, safely replace it with some other
@@ -3960,6 +3969,8 @@ run_window_change_functions (void)
   /* Record changes for all frames (if asked for), selected window and
      frame.  */
   unbind_to (count, Qnil);
+
+  eassert (BUFFER_LIVE_P (XBUFFER (XWINDOW (selected_window)->contents)));
 }
 
 /* Make WINDOW display BUFFER.  RUN_HOOKS_P means it's allowed
@@ -4054,6 +4065,9 @@ set_window_buffer (Lisp_Object window, Lisp_Object buffer,
   if (!samebuf && !MINI_WINDOW_P (w) && !WINDOW_PSEUDO_P (w))
     FRAME_WINDOW_CHANGE (XFRAME (w->frame)) = true;
 
+  if (WINDOWP (selected_window))
+    eassert (BUFFER_LIVE_P (XBUFFER (XWINDOW (selected_window)->contents)));
+
   unbind_to (count, Qnil);
 }
 
@@ -5174,6 +5188,8 @@ DEFUN ("delete-window-internal", Fdelete_window_internal, Sdelete_window_interna
       error ("Deletion failed");
     }
 
+  eassert (BUFFER_LIVE_P (XBUFFER (XWINDOW (selected_window)->contents)));
+
   return Qnil;
 }
 \f
@@ -7233,6 +7249,9 @@ DEFUN ("set-window-configuration", Fset_window_configuration,
   minibuf_selected_window = data->minibuf_selected_window;
 
   SAFE_FREE ();
+
+  eassert (BUFFER_LIVE_P (XBUFFER (XWINDOW (selected_window)->contents)));
+
   return FRAME_LIVE_P (f) ? Qt : Qnil;
 }
 
diff --git a/src/xdisp.c b/src/xdisp.c
index cc0a689ba3..ea64e5037a 100644
--- a/src/xdisp.c
+++ b/src/xdisp.c
@@ -12980,6 +12980,8 @@ restore_selected_window (Lisp_Object window)
       /* Abort if we cannot find a live frame.  */
       emacs_abort ();
     }
+
+  eassert (BUFFER_LIVE_P (XBUFFER (XWINDOW (selected_window)->contents)));
 }
 
 /* Restore WINDOW, if live, as its frame's selected window.  */
@@ -12997,6 +12999,8 @@ restore_frame_selected_window (Lisp_Object window)
       if (EQ (frame, selected_frame))
 	selected_window = window;
     }
+
+  eassert (BUFFER_LIVE_P (XBUFFER (XWINDOW (selected_window)->contents)));
 }
 
 /* Update the tab-bar item list for frame F.  This has to be done
@@ -13074,6 +13078,8 @@ update_tab_bar (struct frame *f, bool save_match_data)
 	  XSETFRAME (frame, f);
 	  selected_frame = frame;
 	  selected_window = FRAME_SELECTED_WINDOW (f);
+
+	  eassert (BUFFER_LIVE_P (XBUFFER (XWINDOW (selected_window)->contents)));
 #endif
 
 	  /* Build desired tab-bar items from keymaps.  */
@@ -14010,6 +14016,8 @@ update_tool_bar (struct frame *f, bool save_match_data)
 	  selected_frame = frame;
 	  selected_window = FRAME_SELECTED_WINDOW (f);
 
+	  eassert (BUFFER_LIVE_P (XBUFFER (XWINDOW (selected_window)->contents)));
+
 	  /* Build desired tool-bar items from keymaps.  */
           new_tool_bar
 	    = tool_bar_items (Fcopy_sequence (f->tool_bar_items),
@@ -17246,6 +17254,8 @@ run_window_scroll_functions (Lisp_Object window, struct text_pos startp)
       set_buffer_internal (XBUFFER (w->contents));
     }
 
+  eassert (BUFFER_LIVE_P (XBUFFER (XWINDOW (selected_window)->contents)));
+
   return startp;
 }
 
@@ -25450,6 +25460,8 @@ display_mode_lines (struct window *w)
 
   unbind_to (count, Qnil);
 
+  eassert (BUFFER_LIVE_P (XBUFFER (XWINDOW (selected_window)->contents)));
+
   if (n > 0)
     w->must_be_updated_p = true;
   return n;

  reply	other threads:[~2021-03-30 16:52 UTC|newest]

Thread overview: 160+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-03-18 15:39 bug#47244: 28.0.50; SIGSEGV in long-runnning Emacs Michael Welsh Duggan
2021-03-18 15:42 ` Michael Welsh Duggan
2021-03-18 15:49   ` Michael Welsh Duggan
2021-03-18 16:02     ` Andreas Schwab
2021-03-18 16:02   ` Eli Zaretskii
2021-03-18 16:27     ` Michael Welsh Duggan
2021-03-18 16:45       ` Eli Zaretskii
2021-03-18 16:54         ` Michael Welsh Duggan
2021-03-18 18:41           ` Eli Zaretskii
2021-03-18 18:54             ` Michael Welsh Duggan
2021-03-18 19:16               ` Eli Zaretskii
2021-03-18 19:24                 ` Michael Welsh Duggan
2021-03-18 19:51                   ` Eli Zaretskii
2021-03-18 20:13                     ` Andreas Schwab
2021-03-18 20:27                       ` Eli Zaretskii
2021-03-19  1:50                         ` Michael Welsh Duggan
2021-03-19  6:47                           ` Eli Zaretskii
2021-03-19 13:37                             ` Michael Welsh Duggan
2021-03-19 13:41                               ` Michael Welsh Duggan
2021-03-19 13:51                                 ` Eli Zaretskii
2021-03-19 13:49                               ` Eli Zaretskii
2021-03-19 14:18                                 ` Michael Welsh Duggan
2021-03-19 14:21                                   ` Michael Welsh Duggan
2021-03-19 15:00                                     ` Eli Zaretskii
2021-03-19 15:14                                       ` Michael Welsh Duggan
2021-03-23 14:18                                       ` Michael Welsh Duggan
2021-03-23 15:02                                         ` Eli Zaretskii
2021-03-23 15:08                                           ` Michael Welsh Duggan
2021-03-23 16:42                                             ` Eli Zaretskii
2021-03-23 15:23                                         ` martin rudalics
2021-03-23 15:53                                           ` Michael Welsh Duggan
2021-03-23 16:45                                             ` Eli Zaretskii
2021-03-24  6:53                                             ` martin rudalics
2021-03-24 14:14                                               ` Michael Welsh Duggan
2021-03-24 16:09                                                 ` martin rudalics
2021-03-25  2:19                                                   ` Michael Welsh Duggan
2021-03-25  6:25                                                     ` Eli Zaretskii
2021-03-29 14:06                                                       ` Michael Welsh Duggan
2021-03-29 14:28                                                         ` Eli Zaretskii
2021-03-29 14:39                                                           ` Michael Welsh Duggan
2021-03-29 15:02                                                             ` Eli Zaretskii
2021-03-29 15:07                                                               ` Eli Zaretskii
2021-03-29 15:21                                                                 ` Michael Welsh Duggan
2021-03-29 15:26                                                                   ` Michael Welsh Duggan
2021-03-29 15:27                                                                   ` Eli Zaretskii
2021-03-29 15:33                                                                     ` Michael Welsh Duggan
2021-03-29 15:34                                                                       ` Michael Welsh Duggan
2021-03-29 15:41                                                                       ` Eli Zaretskii
2021-03-29 16:23                                                                         ` Michael Welsh Duggan
2021-03-29 15:21                                                                 ` Eli Zaretskii
2021-03-29 16:05                                                                   ` martin rudalics
2021-03-29 16:26                                                                     ` Michael Welsh Duggan
2021-03-29 17:33                                                                       ` martin rudalics
2021-03-29 19:12                                                                         ` Michael Welsh Duggan
2021-03-30  7:30                                                                           ` martin rudalics
2021-03-30 13:39                                                                             ` Michael Welsh Duggan
2021-03-30 14:36                                                                               ` martin rudalics
2021-03-30 14:51                                                                                 ` Michael Welsh Duggan
2021-03-30 15:05                                                                                   ` martin rudalics
2021-03-30 14:13                                                                             ` Michael Welsh Duggan
2021-03-30 14:36                                                                               ` martin rudalics
2021-03-30 14:48                                                                                 ` Eli Zaretskii
2021-03-30 15:05                                                                                   ` martin rudalics
2021-03-30 15:13                                                                                     ` Eli Zaretskii
2021-03-30 16:52                                                                                       ` martin rudalics
2021-03-30 17:05                                                                                         ` Eli Zaretskii
2021-03-31  6:41                                                                                           ` martin rudalics
2021-03-31  7:09                                                                                             ` Eli Zaretskii
2021-03-30 15:03                                                                                 ` Michael Welsh Duggan
2021-03-30 16:52                                                                                   ` martin rudalics [this message]
2021-03-31 13:23                                                                                 ` Michael Welsh Duggan
2021-03-31 13:53                                                                                   ` Michael Welsh Duggan
2021-03-31 14:01                                                                                     ` Eli Zaretskii
2021-03-31 14:32                                                                                       ` martin rudalics
2021-03-31 14:48                                                                                         ` Michael Welsh Duggan
2021-03-31 15:49                                                                                           ` martin rudalics
2021-03-31 17:01                                                                                             ` Michael Welsh Duggan
2021-03-31 18:41                                                                                               ` martin rudalics
2021-03-31 19:14                                                                                                 ` Michael Welsh Duggan
2021-03-31 19:18                                                                                                   ` Michael Welsh Duggan
2021-04-01  7:14                                                                                                     ` martin rudalics
2021-04-01  7:45                                                                                                       ` Eli Zaretskii
2021-04-01 13:20                                                                                                         ` Michael Welsh Duggan
2021-04-01 13:22                                                                                                           ` Eli Zaretskii
2021-04-01 13:54                                                                                             ` Michael Welsh Duggan
2021-04-01 14:56                                                                                               ` martin rudalics
2021-04-01 18:30                                                                                                 ` Michael Welsh Duggan
2021-04-01 19:31                                                                                                   ` Michael Welsh Duggan
2021-04-02  6:48                                                                                                   ` martin rudalics
2021-04-05 18:15                                                                                                     ` Michael Welsh Duggan
2021-04-05 18:45                                                                                                       ` martin rudalics
2021-04-05 19:57                                                                                                         ` Michael Welsh Duggan
2021-04-05 20:39                                                                                                           ` martin rudalics
2021-04-05 20:56                                                                                                             ` Michael Welsh Duggan
2021-04-06  8:10                                                                                                               ` martin rudalics
2021-04-06 14:40                                                                                                                 ` Michael Welsh Duggan
2021-04-06 16:12                                                                                                                   ` martin rudalics
2021-04-06 16:48                                                                                                                     ` Michael Welsh Duggan
2021-04-06 17:00                                                                                                                       ` martin rudalics
2021-04-06 17:24                                                                                                                         ` Michael Welsh Duggan
2021-04-07  2:22                                                                                                                           ` Michael Welsh Duggan
2021-04-07  7:52                                                                                                                             ` Andreas Schwab
2021-04-07  9:00                                                                                                                             ` martin rudalics
2021-04-07 12:42                                                                                                                               ` Michael Welsh Duggan
2021-04-07 13:35                                                                                                                                 ` martin rudalics
2021-04-07 15:29                                                                                                                                   ` Michael Welsh Duggan
2021-04-07 16:16                                                                                                                                     ` martin rudalics
2021-04-07 17:37                                                                                                                                       ` Michael Welsh Duggan
2021-04-07 17:55                                                                                                                                         ` Michael Welsh Duggan
2021-04-07 18:31                                                                                                                                         ` Michael Welsh Duggan
2021-04-07 19:25                                                                                                                                           ` Michael Welsh Duggan
2021-04-07 20:25                                                                                                                                             ` martin rudalics
2021-04-07 20:32                                                                                                                                               ` Michael Welsh Duggan
2021-04-08  6:59                                                                                                                                                 ` martin rudalics
2021-04-08 10:47                                                                                                                                                   ` Gregory Heytings
2021-04-08 11:39                                                                                                                                                     ` Eli Zaretskii
2021-04-08 12:06                                                                                                                                                       ` Andreas Schwab
2021-04-08 12:29                                                                                                                                                         ` Eli Zaretskii
2021-04-08 12:43                                                                                                                                                           ` Gregory Heytings
2021-04-08 12:59                                                                                                                                                             ` Eli Zaretskii
2021-04-08 16:20                                                                                                                                                               ` Gregory Heytings
2021-04-08 12:03                                                                                                                                                     ` martin rudalics
2021-04-08 12:24                                                                                                                                                       ` Gregory Heytings
2021-04-08 13:39                                                                                                                                                         ` Michael Welsh Duggan
2021-04-08 14:35                                                                                                                                                   ` Michael Welsh Duggan
2021-04-08 15:08                                                                                                                                                     ` Eli Zaretskii
2021-04-08 15:24                                                                                                                                                       ` Andreas Schwab
2021-04-08 15:21                                                                                                                                                     ` Michael Welsh Duggan
2021-04-08 15:33                                                                                                                                                       ` Michael Welsh Duggan
2021-04-08 15:48                                                                                                                                                       ` martin rudalics
2021-04-08 16:01                                                                                                                                                         ` Michael Welsh Duggan
2021-04-08 16:14                                                                                                                                                           ` martin rudalics
2021-04-08 16:35                                                                                                                                                           ` Eli Zaretskii
2021-04-08 16:42                                                                                                                                                             ` Michael Welsh Duggan
2021-04-08 15:58                                                                                                                                                       ` Eli Zaretskii
2021-04-08 16:05                                                                                                                                                         ` Michael Welsh Duggan
2021-04-08 16:28                                                                                                                                                           ` Eli Zaretskii
2021-04-08 16:37                                                                                                                                                             ` Michael Welsh Duggan
2021-04-08 16:49                                                                                                                                                               ` Eli Zaretskii
2021-04-08 17:15                                                                                                                                                                 ` Michael Welsh Duggan
2021-04-08 17:11                                                                                                                                                         ` Michael Welsh Duggan
2021-04-08 17:46                                                                                                                                                           ` Eli Zaretskii
2021-04-08 17:51                                                                                                                                                             ` Michael Welsh Duggan
2021-04-08 18:52                                                                                                                                                           ` martin rudalics
2021-04-09 20:59                                                                                                                                                             ` Michael Welsh Duggan
2021-04-10  7:15                                                                                                                                                               ` martin rudalics
2021-04-10 14:53                                                                                                                                                                 ` Michael Welsh Duggan
2021-04-10 18:57                                                                                                                                                                   ` martin rudalics
2021-04-17  8:01                                                                                                                                                                     ` martin rudalics
2021-04-20 14:03                                                                                                                                                                       ` Michael Welsh Duggan
2021-04-07 19:40                                                                                                                                           ` Eli Zaretskii
2021-04-07 18:48                                                                                                                                         ` martin rudalics
2021-04-07 18:53                                                                                                                                           ` Michael Welsh Duggan
2021-04-07 20:25                                                                                                                                             ` martin rudalics
2021-04-07  9:00                                                                                                                           ` martin rudalics
2021-03-19  8:15                         ` martin rudalics
2021-03-19  8:19                           ` Eli Zaretskii
2021-03-19  9:18                             ` martin rudalics
2021-03-19  9:37                               ` martin rudalics
2021-03-19 11:55                               ` Eli Zaretskii

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