DMARC-Filter:	OpenDMARC Filter v1.4.2 delorie.com 51OAVCch3777728
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 51OAVCch3777728
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=aFWblISG
X-Recipient:	archive-cygwin AT delorie DOT com
DKIM-Filter:	OpenDKIM Filter v2.11.0 sourceware.org EE92C3858D34
DKIM-Signature:	v=1; a=rsa-sha256; c=relaxed/relaxed; d=cygwin.com;
	s=default; t=1740393070;
	bh=B5kjXONn9ahWjwOmoQRfitXW6Pgat1o8zULi/IX8sRU=;
	h=Subject:To:Date:List-Id:List-Unsubscribe:List-Archive:List-Post:
	List-Help:List-Subscribe:From:Reply-To:Cc:From;
	b=aFWblISGseVd3NIYd7yXoGAwtoJxsRecs8jRbsKEVPTyg2+HYtkobnT/LiWmawPRz
	hfIiTBmMav7Sch6OKRKmITb3q11U8YMtUugHUVOB5nfSsnOEWJQq8b3K9Uha9CfGt7
	xzGdO5K/IoH5OokxgrImjpPdrFhQ83dH41nT4lHo=
X-Original-To:	cygwin AT cygwin DOT com
Delivered-To:	cygwin AT cygwin DOT com
DMARC-Filter:	OpenDMARC Filter v1.4.2 sourceware.org 5E29C3858D26
ARC-Filter:	OpenARC Filter v1.0.0 sourceware.org 5E29C3858D26
ARC-Seal:	i=1; a=rsa-sha256; d=sourceware.org; s=key; t=1740393005; cv=none;
	b=Jl1tuwXuq1CdxhmH3ILAnWkgm6nNsIrewn4UMIhEnJv7+Rc4WdrJ+e7DuZ+y7KloX+p9Y7xmR7nVi4JI+2fA9jGJET8YtPoakVYn+lOuBE7+h9sOndwtpcIu9ygHkRI5hURA7OOmF6lhTe7iZifd5V98HMR83z4lK+b7qd45ALM=
ARC-Message-Signature:	i=1; a=rsa-sha256; d=sourceware.org; s=key;
	t=1740393005; c=relaxed/simple;
	bh=iHWzhIRi1U6jhS/0MKQ5GopMDONTLr/rkhIug0UTrZ4=;
	h=From:Subject:To:Message-ID:Date:MIME-Version;
	b=jZXfY1xUXQJOY72IyPFmth/G/+ha/2RWVLA2uQ3bgbgSKnv21BZfx/Ej0e5iXlVEYTxDBLqgt6n2hHkizNxm91f2ZWMVQXxXbvhpILvm/FGBpVmoa4X4Cvr8/sYUlwhnxd0myjRI6Y83cCnCkOcheY8+fxdyrY9Y/wZTqmigdZE=
ARC-Authentication-Results:	i=1; server2.sourceware.org
DKIM-Filter:	OpenDKIM Filter v2.11.0 sourceware.org 5E29C3858D26
Subject:	cygwin 3.6.0: Signals may fail permanently if received after SIGSTOP
To:	cygwin AT cygwin DOT com
Message-ID:	<8c465025-4858-3113-fe2d-ce00dad21f8a@t-online.de>
Date:	Mon, 24 Feb 2025 11:29:59 +0100
User-Agent:	Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:128.0) Gecko/20100101
	SeaMonkey/2.53.20
MIME-Version:	1.0
X-TOI-EXPURGATEID:	150726::1740393000-9FFFD585-12DC32AB/0/0 CLEAN NORMAL
X-TOI-MSGID:	ff3a85d9-f818-4c1e-920a-02e3d79a64b9
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-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:	Christian Franke via Cygwin <cygwin AT cygwin DOT com>
Reply-To:	cygwin AT cygwin DOT com
Cc:	Christian Franke <Christian DOT Franke AT t-online DOT de>
Sender:	"Cygwin" <cygwin-bounces~archive-cygwin=delorie DOT com AT cygwin DOT com>

This is a multi-part message in MIME format.
--------------71A4059B966BC4C44D797B53
Content-Type: text/plain; charset=UTF-8; format=flowed
Content-Transfer-Encoding: 8bit

Found with 'stress-ng --cpu-sched 1':

Testcase (attached):

$ uname -r
3.6.0-0.387.g8cebbb2b42bf.x86_64

$ gcc -o timersig timersig.c

$ ./timersig
638: fork()=639
!!!!!!!!!!!!!...!!!!!!!!!!!!!SIGSTOP: Permission denied
     0 [itimer] timersig 639 sig_send: error sending signal 14, pid 639, 
pipe handle 0x14C, nb 0, packsize 192, Win32 error 0
SIGKILL: Permission denied

$ kill 639
-bash: kill: (639) - Permission denied

$ kill -9 639
-bash: kill: (639) - Permission denied

$ /bin/kill --force 639

$ /bin/kill --force 639
kill: 639: No such process


A similar problem, but without the "error sending signal" message, 
occurs if the timer is not used but the parent process issues SIGSTOP 
SIGALRM SIGCONT ... sequences.

-- 
Regards,
Christian


--------------71A4059B966BC4C44D797B53
Content-Type: text/plain; charset=UTF-8;
 name="timersig.c"
Content-Transfer-Encoding: base64
Content-Disposition: attachment;
 filename="timersig.c"
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--------------71A4059B966BC4C44D797B53
Content-Type: text/plain; charset="us-ascii"
MIME-Version: 1.0
Content-Transfer-Encoding: 7bit
Content-Disposition: inline


-- 
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

--------------71A4059B966BC4C44D797B53--

- Raw text -