From owner-freebsd-current@freebsd.org Fri Jun 3 03:27:56 2016 Return-Path: Delivered-To: freebsd-current@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:1900:2254:206a::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id 9D089B66F03 for ; Fri, 3 Jun 2016 03:27:56 +0000 (UTC) (envelope-from imb@protected-networks.net) Received: from mail.auburn.protected-networks.net (mail.auburn.protected-networks.net [202.12.127.83]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client CN "mail.auburn.protected-networks.net", Issuer "Protected Networks Root CA" (not verified)) by mx1.freebsd.org (Postfix) with ESMTPS id 2D1A01D66; Fri, 3 Jun 2016 03:27:55 +0000 (UTC) (envelope-from imb@protected-networks.net) Received: from toshi.auburn.protected-networks.net (toshi.auburn.protected-networks.net [192.168.1.10]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (Client did not present a certificate) (Authenticated sender: imb@mail.auburn.protected-networks.net) by mail.auburn.protected-networks.net (Postfix) with ESMTPSA id 486321CC6A; Thu, 2 Jun 2016 23:27:52 -0400 (EDT) Subject: Re: repeatable panic on pageout with 945GM To: Matthew Macy References: <2490f1c7-8153-ece3-49ed-4b3886564fd7@protected-networks.net> <205d4423-b834-9a21-785f-fa15d44c78ec@protected-networks.net> <1551419a1db.12929035f45012.326107747932338888@nextbsd.org> Cc: "K. Macy" , "freebsd-current@freebsd.org" From: Michael Butler Openpgp: id=6F63E6399DCC8E3E94D60F0642FF6BAE0442D492 Message-ID: <82cd3e80-b180-9823-7342-5069401cf11b@protected-networks.net> Date: Thu, 2 Jun 2016 23:27:51 -0400 User-Agent: Mozilla/5.0 (X11; FreeBSD amd64; rv:45.0) Gecko/20100101 Thunderbird/45.1.0 MIME-Version: 1.0 In-Reply-To: <1551419a1db.12929035f45012.326107747932338888@nextbsd.org> Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 7bit X-BeenThere: freebsd-current@freebsd.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Discussions about the use of FreeBSD-current List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 03 Jun 2016 03:27:56 -0000 On 06/02/16 22:31, Matthew Macy wrote: > Tell me if that makes any difference. > > -M > > > ---- On Thu, 02 Jun 2016 16:55:53 -0700 K. Macy wrote ---- > > It looks like it might be trying to remove mappings for a page that doesn't > > have any. It's a bit odd. Likely a bug in cdev_pager_free_page or gem > > release mmap. Compile the kernel and driver with -O0 and look at the page. > > It's too bad I don't support AGP yet with DRM 4.6. Maybe in a week or two. > > > > diff --git a/sys/vm/device_pager.c b/sys/vm/device_pager.c > index 013f0d5..917ece7 100644 > --- a/sys/vm/device_pager.c > +++ b/sys/vm/device_pager.c > @@ -211,7 +211,8 @@ cdev_pager_free_page(vm_object_t object, vm_page_t m) > VM_OBJECT_ASSERT_WLOCKED(object); > if (object->type == OBJT_MGTDEVICE) { > KASSERT((m->oflags & VPO_UNMANAGED) == 0, ("unmanaged %p", m)); > - pmap_remove_all(m); > + if (pmap_page_is_mapped(page)) > + pmap_remove_all(m); > vm_page_lock(m); > vm_page_remove(m); > vm_page_unlock(m); Slight variation -won't build as above; trying with "pmap_page_is_mapped(m)" imb