X-Spam-Check-By: sourceware.org From: "Dave Korn" To: Subject: RE: cygwin-1.dll long-time bug Date: Tue, 18 Apr 2006 17:23:24 +0100 Message-ID: <001901c66304$6aca2710$a501a8c0@CAM.ARTIMI.COM> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" X-Mailer: Microsoft Office Outlook 11 In-Reply-To: <83c75fec0604180212k3169c7ccua914f7432c4b8ceb@mail.gmail.com> Mailing-List: contact cygwin-help@cygwin.com; run by ezmlm Precedence: bulk List-Unsubscribe: List-Subscribe: List-Archive: List-Post: List-Help: , Sender: cygwin-owner@cygwin.com Mail-Followup-To: cygwin@cygwin.com Delivered-To: mailing list cygwin@cygwin.com Content-Transfer-Encoding: 8bit X-MIME-Autoconverted: from quoted-printable to 8bit by delorie.com id k3IGNXwA031541 On 18 April 2006 10:12, burning shadow wrote: > There is a bug in all cygwin processes which leads to 100% CPU usage > and locking another processes. For example, there was a windows update > (installed automatically using Automatic Updates) from Microsoft, > which couldn't be installed until all cygwin processes are stopped. It > happens with some utilities which somehow work with process > information. For example, this happens if I try to see threads tab of > cygwin process in Process Explorer. I thought it was a Process > Explorer's bug, but the same happens with another utilities, and even > with windows updates. It's not a bug, it's a feature :) Actually, it's an unexpected interaction, quite possibly a side-effect of injecting MSVCRT-based code into a cygwin-based thread and having them fight over ownership of various TLS slots. It's very hard to track down though because debugging the csrss subsystem whilst using a debugger based on the win32 gui can be just a bit tricky..... :) Ah, I just found something out. The function that's causing all the trouble is ntdll!RtlpQueryProcessDebugInformationRemote; that's somehow going into a massive task-switching thrash against csrss and never completing. Second time you bring up the thread monitor you get a second thread doing the same thing. Hey, I've got something to work with now... I'll keep the list posted. cheers, DaveK -- Can't think of a witty .sigline today.... -- Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple Problem reports: http://cygwin.com/problems.html Documentation: http://cygwin.com/docs.html FAQ: http://cygwin.com/faq/