From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-qe0-f53.google.com (mail-qe0-f53.google.com [209.85.128.53]) by kanga.kvack.org (Postfix) with ESMTP id 49BDD6B0031 for ; Thu, 19 Dec 2013 16:08:06 -0500 (EST) Received: by mail-qe0-f53.google.com with SMTP id nc12so1543190qeb.40 for ; Thu, 19 Dec 2013 13:08:06 -0800 (PST) Date: Thu, 19 Dec 2013 15:24:16 -0500 From: Dave Jones Subject: Re: bad page state in 3.13-rc4 Message-ID: <20131219202416.GA14519@redhat.com> References: <20131219040738.GA10316@redhat.com> <20131219155313.GA25771@redhat.com> <20131219181134.GC25385@kmo-pixel> <20131219182920.GG30640@kvack.org> <20131219192621.GA9228@kvack.org> <20131219195352.GB9228@kvack.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20131219195352.GB9228@kvack.org> Sender: owner-linux-mm@kvack.org List-ID: To: Benjamin LaHaise Cc: Linus Torvalds , Kent Overstreet , Linux Kernel , linux-mm , Christoph Lameter , Al Viro On Thu, Dec 19, 2013 at 02:53:52PM -0500, Benjamin LaHaise wrote: > is populated into the page tables). The only place I can see things going > off the rails is if the get_user_pages() call fails. It's possible trinity > could be arranging things so that the get_user_pages() call is failing > somehow. Also, if it were a double free of a page, we should at least get > a VM_BUG() occuring when the page's count is 0. > > Dave -- do you have CONFIG_DEBUG_VM on in your test rig? Yes. Note the original trace in this thread was a VM_BUG_ON(atomic_read(&page->_count) <= 0); Right after these crashes btw, the box locks up solid. So bad that traces don't always make it over usb-serial. Annoying. Dave -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org