DMARC-Filter:	OpenDMARC Filter v1.4.2 delorie.com 61Q8FdtS970440
Authentication-Results:	delorie.com; dmarc=pass (p=none dis=none) header.from=cygwin.com
Authentication-Results:	delorie.com; spf=pass smtp.mailfrom=cygwin.com
DKIM-Filter:	OpenDKIM Filter v2.11.0 delorie.com 61Q8FdtS970440
Authentication-Results:	delorie.com;
	dkim=pass (1024-bit key, unprotected) header.d=cygwin.com header.i=@cygwin.com header.a=rsa-sha256 header.s=default header.b=fweq77cu
X-Recipient:	archive-cygwin AT delorie DOT com
DKIM-Filter:	OpenDKIM Filter v2.11.0 sourceware.org BDF494BA23E6
DKIM-Signature:	v=1; a=rsa-sha256; c=relaxed/relaxed; d=cygwin.com;
	s=default; t=1772093738;
	bh=jAQVkYrPHo+2J81qvhtoIADtmMs+Phf23Br1QnhK5jk=;
	h=Date:To:Cc:Subject:References:In-Reply-To:List-Id:
	List-Unsubscribe:List-Archive:List-Post:List-Help:List-Subscribe:
	From:Reply-To:From;
	b=fweq77cuCiYuSE/CXGbVGu2FiyTiJnk23eOJ8ab/yo25mrruboSjwDxDnmWUZL61S
	6NQNE4yfKB7v/f45FTSWk7dj28PJ0NKG4Agr9JAJfb2R0kP7t7x7q/oQ2jb2jEtQJ6
	ELEhVX2doi4Smgz6MfrnKEfAOjS8AFnPr2aYzafA=
X-Original-To:	cygwin AT cygwin DOT com
Delivered-To:	cygwin AT cygwin DOT com
DMARC-Filter:	OpenDMARC Filter v1.4.2 sourceware.org DAD224BA543C
ARC-Filter:	OpenARC Filter v1.0.0 sourceware.org DAD224BA543C
ARC-Seal:	i=1; a=rsa-sha256; d=sourceware.org; s=key; t=1772093720; cv=none;
	b=buE7VWZSM8AvEqfM2gXeHW5ER6kiu2SCWC6lS4mFzrf2uGysj5/hbJNJNxi7dqAjrAd38ZZ8xStIJonJBuEuZxpPgNV1EtQNjV37UGO3UP5GWPIzOmMGNWefYv3+3lzU2Qzk18IdBNofRfBLkVlRAJvE/794xNJLv2H41zk8OlM=
ARC-Message-Signature:	i=1; a=rsa-sha256; d=sourceware.org; s=key;
	t=1772093720; c=relaxed/simple;
	bh=4+HpoOc+ebLo7aSNvF/zq9YgSzl2flxX3YPQ9gnY+5E=;
	h=DKIM-Signature:Date:From:To:Subject:Message-ID:MIME-Version;
	b=FQFG/dBaEaS31XVBM/4nQdMHRS1KO1K/t5D94I0UqIURYvPQ5UQ41Clu6TJqHFlQbYD60l6wYDR385WgKdtfDkMdExWu/FueIDF5GFBpvImFPvh/SgiiuGgJ39WGwwqzQzx68qL+/tb8lVZHFf9kpfKnwfy9Yr33D5XbWh4VLns=
ARC-Authentication-Results:	i=1; server2.sourceware.org
DKIM-Filter:	OpenDKIM Filter v2.11.0 sourceware.org DAD224BA543C
Date:	Thu, 26 Feb 2026 03:15:17 -0500
To:	KENNON J CONRAD <kennonconrad AT comcast DOT net>
Cc:	KENNON J CONRAD via Cygwin <cygwin AT cygwin DOT com>
Subject:	Re: Memmove causing program crashes, giving SIGTRAP in GDB(?)
Message-ID:	<aaABFf5iEowV1l7I@xps13>
References:	<547312365 DOT 1464244 DOT 1771958282029 AT connect DOT xfinity DOT com>
	<aZ7PrbisVR1R4A7v AT dimstar DOT local DOT net>
	<1670201592 DOT 1489273 DOT 1772043520008 AT connect DOT xfinity DOT com>
	<e91d8b5b-2690-4271-aa74-e6226440e33d AT SystematicSW DOT ab DOT ca>
	<1044918836 DOT 1507810 DOT 1772086967212 AT connect DOT xfinity DOT com>
	<1579472684 DOT 1508349 DOT 1772092747339 AT connect DOT xfinity DOT com>
MIME-Version:	1.0
In-Reply-To:	<1579472684.1508349.1772092747339@connect.xfinity.com>
X-BeenThere:	cygwin AT cygwin DOT com
X-Mailman-Version:	2.1.30
List-Id:	General Cygwin discussions and problem reports <cygwin.cygwin.com>
List-Unsubscribe:	<https://cygwin.com/mailman/options/cygwin>,
	<mailto:cygwin-request AT cygwin DOT com?subject=unsubscribe>
List-Archive:	<https://cygwin.com/pipermail/cygwin/>
List-Post:	<mailto:cygwin AT cygwin DOT com>
List-Help:	<mailto:cygwin-request AT cygwin DOT com?subject=help>
List-Subscribe:	<https://cygwin.com/mailman/listinfo/cygwin>,
	<mailto:cygwin-request AT cygwin DOT com?subject=subscribe>
From:	Glenn Strauss via Cygwin <cygwin AT cygwin DOT com>
Reply-To:	Glenn Strauss <gs-cygwin DOT com AT gluelogic DOT com>
Errors-To:	cygwin-bounces~archive-cygwin=delorie DOT com AT cygwin DOT com
Sender:	"Cygwin" <cygwin-bounces~archive-cygwin=delorie DOT com AT cygwin DOT com>

On Wed, Feb 25, 2026 at 11:59:07PM -0800, KENNON J CONRAD via Cygwin wrote:
> Okay, so now I learned about setting the frame and disassemble and see the memmove code:
> 
> Dump of assembler code for function memmove:
[snip]
> => 0x00007ff96ba812a9 <+137>:	rep movsq %ds:(%rsi),%es:(%rdi)
[snip]
> End of assembler dump.

movsq requires address alignment of 8 bytes.
What are the pointer addresses of the arguments to memmove()?
A SIGTRAP may result if the addresses are not 8-byte aligned.

Cheers, Glenn

-- 
Problem reports:      https://cygwin.com/problems.html
FAQ:                  https://cygwin.com/faq/
Documentation:        https://cygwin.com/docs.html
Unsubscribe info:     https://cygwin.com/ml/#unsubscribe-simple

- Raw text -