From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-0.8 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE, SPF_PASS autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id B1DCCC2BA19 for ; Thu, 9 Apr 2020 19:12:53 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 7876821473 for ; Thu, 9 Apr 2020 19:12:53 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1586459573; bh=w5tU/kCw38RyRoJYkhBQPrjFX7acMPUYMj5VnLDqmh0=; h=Date:From:To:Cc:Subject:In-Reply-To:References:List-ID:From; b=jTsSM5GWCHZ3zdWGU4E0SKn5eGNYnzw1AzjssAVboq3+CYUUlM20kUhUNNXG5Fjrp K0PitQZUUtj0BG/9jhIDrGO3XptajUgaWTEElFSfAUQBifE5jv6keKRraROQwcHOQ3 69z53SSUzPLA9pfPaZkY+2kP8jwz9UYM2xkvEuEw= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726734AbgDITMv (ORCPT ); Thu, 9 Apr 2020 15:12:51 -0400 Received: from mail.kernel.org ([198.145.29.99]:52570 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726598AbgDITMv (ORCPT ); Thu, 9 Apr 2020 15:12:51 -0400 Received: from localhost.localdomain (c-73-231-172-41.hsd1.ca.comcast.net [73.231.172.41]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id C26C3206F5; Thu, 9 Apr 2020 19:12:50 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1586459571; bh=w5tU/kCw38RyRoJYkhBQPrjFX7acMPUYMj5VnLDqmh0=; h=Date:From:To:Cc:Subject:In-Reply-To:References:From; b=ew7YWipmFdFw4ZOnEXmu0u65SxULek0wfv6Jk8IjmIKOipMxjFau7kSH7UHYeTZJW i67trMoIuv24VkZQR7FBSeXO5+RBTyTelyPHlv3RsCZ7st2lqoCM+AQpQ2Oo/iE4UL ah9QPejmMx9hdvMjpr5OqvcZbIPm/sdAdp4q/tWc= Date: Thu, 9 Apr 2020 12:12:50 -0700 From: Andrew Morton To: Linus Torvalds Cc: Dmitry Vyukov , Matthew Wilcox , Peter Xu , LKML , Linux-MM , syzkaller-bugs , syzkaller Subject: Re: [PATCH 0/2] mm: Two small fixes for recent syzbot reports Message-Id: <20200409121250.d6bba6965b86c8dfcf325fbc@linux-foundation.org> In-Reply-To: References: <20200408014010.80428-1-peterx@redhat.com> <20200408174732.bc448bbe41d190bfe5cc252e@linux-foundation.org> <20200409114940.GT21484@bombadil.infradead.org> <20200409111604.c778ff091c00fab5db095e48@linux-foundation.org> X-Mailer: Sylpheed 3.5.1 (GTK+ 2.24.31; x86_64-pc-linux-gnu) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Thu, 9 Apr 2020 11:53:33 -0700 Linus Torvalds wrote: > On Thu, Apr 9, 2020 at 11:16 AM Andrew Morton wrote: > > > > Could I please direct attention back to my original question regarding > > the problems we've recently discovered in 4426e945df58 ("mm/gup: allow > > VM_FAULT_RETRY for multiple times") and 71335f37c5e8 ("mm/gup: allow to > > react to fatal signals")? > > What earlier question? The "how could this happen" one? > > Dmitry already answered that one - are you perhaps missing the emails? Yup, email threading got broken. > linux-next has apparently not worked at all for over a month. So it > got no testing at all, and thus also all the gup patches got no > testing in linux-next. > > Only when they hit my tree, did they start getting testing. Not > because my tree is the only thing getting tested, but because my tree > is the only tree that _works_. > And now the challenge is to protect your tree from the bad patches. https://groups.google.com/forum/#!msg/syzkaller-bugs/phowYdNXHck/qU1P0TsjBAAJ points at net/openvswitch/conntrack.c net/bluetooth/l2cap_sock.c sound/core/oss/pcm_plugin.c and other things, but it's 2+ weeks old.