X-Spam-Check-By: sourceware.org Date: Wed, 18 Jan 2006 11:08:45 -0500 From: Christopher Faylor To: cygwin@cygwin.com Subject: Re: Intermittent cygwin heap allocation problem Message-ID: <20060118160845.GA15870@trixie.casa.cgf.cx> Reply-To: cygwin@cygwin.com References: <43CE4834.1010702@hones.org.uk> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.5.11 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 On Wed, Jan 18, 2006 at 03:16:27PM -0000, Dave Korn wrote: >Cliff Hones wrote: >> [main] ? (2604) C:\cygwin\bin\bash.exe: *** fatal error - couldn't allocate heap, Win32 error 487, base 0x480000, top 0x4A0000, reserve_size 126976, allocsize 131072, page_const 4096 >> [main] bash 2160 child_copy: stack write copy failed, 0x22E960..0x230000, done 0, windows pid 2287764, Win32 error 5 bash: fork: No error > >>appreciate useful suggestions of how best to do this). Looking at the >>Cygwin source, I see that the error is caused by Windows VirtualAlloc >>responding with Invalid Address error, yet the area being allocated >>(base 480000, top 4a0000, size 128MB) looks ok to me. Am I right in >>thinking this means Windows thinks (part of) this area is already in >>use in the forkee? > > >It is, as you guessed, already in use. > >It relates to the little bit of extra data that cygwin keeps in memory >allocated immediately after each .dll that is loaded in an image. > >The code that allocates these is flexible, and if it can't allocate >space immediately after the dll it will work its way up in memory until >it succeeds. Actually, this kind of error is more likely to be caused by a thread starting prior to cygwin initialization and grabbing cygwin's heap area to use for its stack. I moved things around a bit in 1.5.19 to try to avoid that but I guess it was for naught. cgf -- 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/