GNU bug report logs - #78738
(signal nil 5) crashes Emacs

Previous Next

Full log

Message #17 received at 78738 <at> debbugs.gnu.org (full text, mbox):

From: Manuel Giraud <manuel <at> ledu-giraud.fr>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: Pip Cet <pipcet <at> protonmail.com>, dancol <at> dancol.org, 78738 <at> debbugs.gnu.org
Subject: Re: bug#78738: (signal nil 5) crashes Emacs
Date: Tue, 10 Jun 2025 13:46:10 +0200

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

>> Cc: 78738 <at> debbugs.gnu.org
>> Date: Tue, 10 Jun 2025 06:22:49 +0000
>> From:  Pip Cet via "Bug reports for GNU Emacs,
>>  the Swiss army knife of text editors" <bug-gnu-emacs <at> gnu.org>
>> 
>> "Daniel Colascione" <dancol <at> dancol.org> writes:
>> 
>> > (signal nil 5) crashes Emacs
>> 
>> Good catch!
>> 
>> This would fix it, right?
>> 
>> diff --git a/src/eval.c b/src/eval.c
>> index fbb881d682d..be6d1a0a9ac 100644
>> --- a/src/eval.c
>> +++ b/src/eval.c
>> @@ -1888,7 +1888,7 @@ DEFUN ("signal", Fsignal, Ssignal, 2, 2, 0,
>>    (Lisp_Object error_symbol, Lisp_Object data)
>>  {
>>    /* If they call us with nonsensical arguments, produce "peculiar error".  */
>> -  if (NILP (error_symbol) && NILP (data))
>> +  if (NILP (error_symbol) && !CONSP (data))
>>      error_symbol = Qerror;
>>    signal_or_quit (error_symbol, data, false);
>>    eassume (false);
>
> Thanks.  If this keeps bug#32961 solved, please install on the
> emacs-30 branch, since this is a regression in Emacs 30.

On this matter, what is the code path that leads to a call to
signal_or_quit with a nil error_symbol parameter?  According to the
comment at eval.c:1912, it means that the memory is full but I cannot
figure out how we can get there.
-- 
Manuel Giraud

Previous Next

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