X-Recipient:	archive-cygwin AT delorie DOT com
DomainKey-Signature:	a=rsa-sha1; c=nofws; d=sourceware.org; h=list-id
	:list-unsubscribe:list-subscribe:list-archive:list-post
	:list-help:sender:from:to:subject:date:message-id:references
	:in-reply-to:content-type:content-id:content-transfer-encoding
	:mime-version; q=dns; s=default; b=ans2d0pdoPwaPOKkKlaK+U7eA3iAi
	r+7fgOnL20sllpoADNZgU3FzlEdRGsMKc3uSQO3j0/9JXR7lsnAhm7XY90zn0Efs
	mgltWHPc9HiEFF/SJRHzIZq+Lgma+03mwmt/AQaeAMVcwaAAboKF8Qo9cL0r0MNm
	y6yk1Z5OAghkLA=
DKIM-Signature:	v=1; a=rsa-sha1; c=relaxed; d=sourceware.org; h=list-id
	:list-unsubscribe:list-subscribe:list-archive:list-post
	:list-help:sender:from:to:subject:date:message-id:references
	:in-reply-to:content-type:content-id:content-transfer-encoding
	:mime-version; s=default; bh=uee0l2gE1hKP5SELbD50QcnZKUY=; b=bH5
	HvR8TQKmXE9XYflT+C8Yjxc/t0MuJjmli+KcCFuSsjOEQ3iw4vtDzwJaAfQJkiAo
	z4qIEtAnB1UcLTDgijhaBdF7lu2vnQIAwNF5r8HEjijIQfwH6K7HTJQYPqK8JCvm
	zMTleREEFN1PGXj6jKLoefS2CddAjGW2gSLPlOLU=
Mailing-List:	contact cygwin-help AT cygwin DOT com; run by ezmlm
List-Id:	<cygwin.cygwin.com>
List-Subscribe:	<mailto:cygwin-subscribe AT cygwin DOT com>
List-Archive:	<http://sourceware.org/ml/cygwin/>
List-Post:	<mailto:cygwin AT cygwin DOT com>
List-Help:	<mailto:cygwin-help AT cygwin DOT com>, <http://sourceware.org/ml/#faqs>
Sender:	cygwin-owner AT cygwin DOT com
Mail-Followup-To:	cygwin AT cygwin DOT com
Delivered-To:	mailing list cygwin AT cygwin DOT com
Authentication-Results:	sourceware.org; auth=none
X-Spam-SWARE-Status:	No, score=-6.9 required=5.0 tests=BAYES_00,GIT_PATCH_2,RCVD_IN_DNSWL_NONE,SPF_HELO_PASS,SPF_PASS autolearn=ham version=3.3.1 spammy=installing, H*M:2b5e
X-HELO:	NAM02-SN1-obe.outbound.protection.outlook.com
ARC-Seal:	i=1; a=rsa-sha256; s=arcselector9901; d=microsoft.com; cv=none; b=niYLZ6oHgn3o+ncW49YTd7+y6c3yT8aJOfuFPJiLOynluVxD0ret6wtCdW4bG1CffPkQMbxuLGXfzTb0PPtDByDEr6Oj7b3jEuXJ11Bqfz35w2WZBNctmNkepoCVEtO0QWJrFdNcZbDmrMwuPlI9I5pi04+7Ez3EBD+GWaXzSYLkOfc/uYHBqoIu6bb0VHn5ynI8p6/5df1F/qGfby6ocacoDAVq0VIgf74Jg/pz3Oj/cziZqGvafYi1kJO1G9/Sj1Eo54O2wgji0gnVUiMFWgIuz80RYs85vxtv/SMDTCVd0ccTdFJhY7QR+zLhHqxJqULhME6qHDskzjSjbjbRYw==
ARC-Message-Signature:	i=1; a=rsa-sha256; c=relaxed/relaxed; d=microsoft.com; s=arcselector9901; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=VNg2WZyRHVdN8QFPZbXUxVp5Q9L78+wc5yv/tfRL3TM=; b=iyjj69kwrlvg0EVKkzDM2bq6vgHi9/igU4O+Htb037MwAtucyAbCqiGx4XJ4tL8EWIEQJTweVA6T5289JPcJq5b4tNJCWkDaGbuhyBbqtFbS3riCJgOGW1prqsJbxO1WLatwYwpSqfhFiU3HpIuUIDXqp6IPzKlEd3f5TfudiJ3gBlB3s0pBds/P/Hc5e4HJ/inxjAfM7penxKLvlWOgesaihJS+2QW0Jr3oR2qsTRXXJVGJYu3wpsW8BNGQJgKTTTMK6WqmF5rtt8lUvnW9/UN4smTj/o8yY9RNb9jg5BHmOTH1Tk0GckK+t7AWb45dvwF/2L1HYgL1tb+TF8sr9w==
ARC-Authentication-Results:	i=1; mx.microsoft.com 1; spf=pass smtp.mailfrom=cornell.edu; dmarc=pass action=none header.from=cornell.edu; dkim=pass header.d=cornell.edu; arc=none
DKIM-Signature:	v=1; a=rsa-sha256; c=relaxed/relaxed; d=cornell.edu; s=selector2; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=VNg2WZyRHVdN8QFPZbXUxVp5Q9L78+wc5yv/tfRL3TM=; b=j3nZV/pyrqR/dI9GheaKZV2Mg8HYO9U7Z4cmb3n4ir4hIhb/mJuD2dXD6SxxG8m9421YEcW9oG85J5SoSK7nx+XQYyhvXgjYLO/AzJc0+gQehnTQ+feT9bz2ueNsLv+5fQfTZv//1yCi9gG/HmOUgkfxHcEoFZKhw81+8QzztKc=
From:	Ken Brown <kbrown AT cornell DOT edu>
To:	"cygwin AT cygwin DOT com" <cygwin AT cygwin DOT com>
Subject:	Re: program exit code, "at exit" handler and explicit close of shared objects
Date:	Tue, 29 Oct 2019 14:53:41 +0000
Message-ID:	<20754eea-2b5e-dbbb-6027-2643be062e41@cornell.edu>
References:	<a24efbf6-872e-1e5b-017a-b14c59d84550 AT roumenpetrov DOT info>
In-Reply-To:	<a24efbf6-872e-1e5b-017a-b14c59d84550@roumenpetrov.info>
user-agent:	Mozilla/5.0 (Windows NT 10.0; WOW64; rv:60.0) Gecko/20100101 Thunderbird/60.9.0
authentication-results:	spf=none (sender IP is ) smtp.mailfrom=kbrown AT cornell DOT edu;
x-ms-oob-tlc-oobclassifiers:	OLM:5236;
received-spf:	None (protection.outlook.com: cornell.edu does not designate permitted sender hosts)
x-ms-exchange-senderadcheck:	1
x-ms-exchange-transport-forked:	True
MIME-Version:	1.0
X-MS-Exchange-CrossTenant-mailboxtype:	HOSTED
X-MS-Exchange-CrossTenant-userprincipalname:	hAevUnaeMu1ichOQbLG5wfwGcMAPefaUp1zpiQxs2tsSbLWzZYn5q/5KOVYf5uVLQaFlbSuOfkrAYKTOIXHemw==
X-IsSubscribed:	yes
X-MIME-Autoconverted:	from quoted-printable to 8bit by delorie.com id x9TEsGBY002265

On 10/26/2019 11:07 AM, Roumen Petrov wrote:
> 
> After additional tests (research) I was able to isolate issues to simple test 
> case. Please find attached "test-dlclose.c" and "Makefile".
> First test is as is:
> 
> $ make
> cc -g -Wall -Wextra    test-dlclose.c   -o test-dlclose
> ./test-dlclose
> exit with code 33
> make: [Makefile:4: all] Error 33 (ignored)
> 
> For next test change test-dlclose.c to define DLCLOSE_ATEXIT ( s/#if 0/#if 1/ ):
> $ make
> cc -g -Wall -Wextra    test-dlclose.c   -o test-dlclose
> ./test-dlclose
> exit with code 33

I ran this second version of test-dlclose (with DLCLOSE_ATEXIT defined) under 
strace and got the following:

$ strace -o trace.out ./test-dlclose.exe 
exit with code 33
Segmentation fault

The strace output ends with

    30   30143 [main] test-dlclose 847 write: 18 = write(1, 0x600061E20, 18)
--- Process 33456 (pid: 847) unloaded DLL at 00000003e7930000
--- Process 33456 (pid: 847), exception c0000005 at 00000003e7931080
--- Process 33456 (pid: 847) thread 26088 exited with status 0xc0000005
--- Process 33456 (pid: 847) thread 33544 exited with status 0xc0000005
--- Process 33456 (pid: 847) thread 36020 exited with status 0xc0000005
--- Process 33456 exited with status 0xc0000005

The address 00000003e7930000 seems to be in /usr/bin/cygz.dll, which is the DLL 
that got unloaded.  After installing zlib-debuginfo, I ran addr2line to see 
where the crash occurred, and this too crashed:

$ addr2line -C -f -i -p -e /usr/bin/cygz.dll 0x3e7931080
Segmentation fault (core dumped)

That's as far as I've gotten.

Ken

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

- Raw text -