GNU bug report logs - #66744
30.0.50; Emacs crashes when re-dumping into the same dump file another Emacs instance is using

Previous Next

Full log

View this message in rfc822 format

From: Gerd Möllmann <gerd.moellmann <at> gmail.com>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: yantar92 <at> posteo.net, 66744 <at> debbugs.gnu.org
Subject: bug#66744: 30.0.50; Emacs crashes when re-dumping into the same dump file another Emacs instance is using
Date: Thu, 26 Oct 2023 18:32:23 +0200

Eli Zaretskii <eliz <at> gnu.org> writes:

>> Cc: 66744 <at> debbugs.gnu.org
>> From: Gerd Möllmann <gerd.moellmann <at> gmail.com>
>> Date: Thu, 26 Oct 2023 17:45:49 +0200
>> 
>> The linux man page for mmap says, according to Google,
>> 
>>   MAP_PRIVATE
>>        ...
>>       It is unspecified whether changes made to the file
>>       after the mmap() call are visible in the mapped region.
>> 
>> So, if the changes made to the dump file in step 3 are visible in the
>> mmaped dump file that Emacs from step 2 uses, that would be a bit
>> suboptimal :-).
>
> Emacs on GNU/Linux doesn't use mmap, we stopped doing this many years
> ago.

Ok, but I must admit that I don't see how that is done in pdumper.c.

Previous Next

GNU bug tracking system
Copyright (C) 1999 Darren O. Benham, 1997,2003 nCipher Corporation Ltd, 1994-97 Ian Jackson.