GNU bug report logs - #47244
28.0.50; SIGSEGV in long-runnning Emacs

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Message #122 received at 47244 <at> debbugs.gnu.org (full text, mbox):

From: martin rudalics <rudalics <at> gmx.at>
To: Michael Welsh Duggan <mwd <at> cert.org>
Cc: "mwd <at> md5i.com" <mwd <at> md5i.com>,
 "47244 <at> debbugs.gnu.org" <47244 <at> debbugs.gnu.org>, Eli Zaretskii <eliz <at> gnu.org>,
 "schwab <at> linux-m68k.org" <schwab <at> linux-m68k.org>
Subject: Re: bug#47244: 28.0.50; SIGSEGV in long-runnning Emacs
Date: Wed, 24 Mar 2021 17:09:24 +0100

>> The attached one should make more sense.  Please use that.
>
> I did, and the SEGFAULT happened fairly shortly afterward.  The error
> did not trigger, so the cause is still unknown.  I'll keep the gdb
> session around, but that backtrace is pretty much the same.

I'm not surprised.  The check for `replace-buffer-in-windows' does
pretty much the same as Eli's approach.  You just don't have to run
Emacs in the debugger in order to use it.

Maybe try now:

diff --git a/src/buffer.c b/src/buffer.c
index 8e33162989..9ca5731bcf 100644
--- a/src/buffer.c
+++ b/src/buffer.c
@@ -2151,6 +2151,9 @@ 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.  */

martin

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