X-Recipient:	archive-cygwin AT delorie DOT com
X-SWARE-Spam-Status:	No, hits=-3.6 required=5.0 tests=AWL,BAYES_00,DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,KHOP_RCVD_TRUST,RCVD_IN_DNSWL_LOW,RCVD_IN_HOSTKARMA_YE,RP_MATCHES_RCVD
X-Spam-Check-By:	sourceware.org
X-Google-DKIM-Signature:	v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20120113; h=mime-version:date:message-id:subject:from:to:content-type :x-system-of-record:x-gm-message-state; bh=eh1UfKXeR8eDUb6x1d1xgcoTsiczvmEVadB5WvO0QKg=; b=YJenid8nXmEv0j0KG8isWEcq06q7xDl40C8kw6hXgSB8SZ8dnx/F36FZehRjaLBv6+ R/XNpaEcAHzpasC2i5c8P/zX4kmkjbrQ4/JbThZqYepskhB9JNL+McSFnEj+42dGyUJp Gw5ZkH8jncJhmFm6Umg0uxwYzRhjuEFzPFCGEiGXyVp+C6m9ACN2az+4hIFo5m4AfJig cEbfKfNwUWZ0mvSY05R35P/BjHKf2QX3RqKOdItwXd18ydWGGGWfE7Q4KpGh39l1NaEH iF63ayNU77fY49JCSA0SoSoPZpWh+ZXOFQx93R93B1C2LzkyI9VndQQyVxJYs2I0bj8l +ZlA==
MIME-Version:	1.0
Date:	Thu, 16 Aug 2012 20:20:37 +0400
Message-ID:	<CACgPhYoVzcUEH-w1Lx5zgwbY-Jic67sH=gwy2qGiqMrv519sOA@mail.gmail.com>
Subject:	Re: Cygwin crashes in kill_pgrp, _pinfo truncation issue.
From:	Andrey Khalyavin <halyavin AT google DOT com>
To:	cygwin AT cygwin DOT com
X-System-Of-Record:	true
X-Gm-Message-State:	ALoCoQndayVgQRtMlkPSXQ8AOA0qBdkI1rMjnDdx5Ah3nHRQzpDqqltOQ8YZ5e0tHGggL7qS22sLvVyQnT5ynveAuVjqxmSvh5TMolil8foXZCv7hqeMnlC6e8sZS4VSi3qpoh7RPAU3hW1Z2Qj1OOolhOpIE19W5hfaW/lL/YlHLbA1y8Gy+aeeFDluTojZAmJKO45WUQMs
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

On Wed, 15 Aug 2012 10:11:16 -0400, Christopher Faylor wrote:
>On Wed, Aug 15, 2012 at 04:54:42PM +0400, Andrey Khalyavin wrote:
>>I finally got a cygwin crash dump from our build bots. It shows, that
>>cygwin1.dll crashes in kill_pgrp function on line:
>>	  (pid > 1 && p->pgid != pid) ||
>>where p is a pointer to _pinfo. This function enumerates all _pinfo's
>>and executes this line for all of them which pass p->exists() check.
>>In crash dump p points to _pinfo that has process_state equal to
>>PID_IN_USE | PID_EXECED.
>
>Thanks for tracking this down.  I've added a check for "execed" to
>_pinfo::exists.
>
>cgf
I updated core libraries from 20120803 snapshot to 20120815 snapshot
and now bash crashes when I execute rm -rf dir. Reproducibility is
strange. It crashed for hours when I entered
cd /tmp
mkdir a
rm -rf a
commands but now suddenly stopped crashing in this case.
It is still crashes on rm -rf in the real script we use though.

Crash happens in setup_handler function on line
	  HANDLE hth = (HANDLE) *tls;
because tls->tid equals to zero. Definition of this operation is in
sygtls.h: operator HANDLE () const {return tid->win32_obj_id;}.
setup_handler is called from sigpacket::process which in turn
called from wait_sig. Signal number is 20, signal code is 28.
All fields of tls structure are zero with exception stacklock equal
to 1 and stackptr equal to address of tls->stack.

I don't understand what goes wrong here. Can you suggest what
I can look for in the debugger?

Andrey Khalyavin

--
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 -