X-Recipient: archive-cygwin AT delorie DOT com
X-SWARE-Spam-Status: No, hits=-10.6 required=5.0 	tests=BAYES_00,RCVD_IN_DNSWL_HI
X-Spam-Check-By: sourceware.org
From: "Schmidt, Oliver" <oliv DOT schmidt AT sap DOT com>
To: "cygwin AT cygwin DOT com" <cygwin AT cygwin DOT com>
Date: Fri, 12 Mar 2010 16:48:14 +0100
Subject: Re: Cygwin 1.7: Concurrency Issue with Shared State Initialization
Message-ID: <B10B50309DC54D45A855FD66F56015F71D07DD7E50@DEWDFECCR03.wdf.sap.corp>
Content-Type: text/plain; charset="us-ascii"
Content-Transfer-Encoding: quoted-printable
MIME-Version: 1.0
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

Hi,

> Does the patch help?

As the issue is sporadic it's not that easy to come up with a conclusive
answer...

I downloaded http://cygwin.com/snapshots/cygwin1-20100309.dll.bz2,=20
unpacked and renamed the DLL and used it as drop-in replacement to the
1.7.1 DLL.

I experienced three times by now the effect that echo.exe "hangs" without
using significant CPU time. Attaching a MSVC debugger I could only find
out that in all three cases the executable stays in this endless loop:

7D6373D2  cmp         dword ptr ds:[7D6A0220h],edi=20
7D6373D8  jne         7D628061=20
7D6373DE  lea         eax,[ebp-28h]=20
7D6373E1  push        eax=20=20
7D6373E2  push        ebx=20=20
7D6373E3  call        7D61CCB1=20
7D6373E8  cmp         eax,ebx=20
7D6373EA  jge         7D6373D2=20

I'm sort of reluctant to present this information this way as I'm afraid
I'm to give someone a bum steer. However I haven't had this effect so far
with with the 1.7.1 DLL so it would be at least one possible explanation
that the patch has a bug showing up in the very sporadic case it is
supposed to fix.

Regards, Oliver

--
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