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 38660C2BA2B for ; Thu, 9 Apr 2020 00:47:35 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 086132084D for ; Thu, 9 Apr 2020 00:47:35 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1586393255; bh=2nhQyL/DP2Bqtl9oIGFAy7+8v5UeTnbKXjY+RkRbpl8=; h=Date:From:To:Cc:Subject:In-Reply-To:References:List-ID:From; b=B0cztJZ4JykBxgAbaQ9ZM+78mpcKBXxMS1d80AGDpbmyYrxiXyac3V+gxKugSSQrJ eUCe2S3OmGnspjGzVfT9PcCENNAyAzMBcYLr7J7erZLE9YlE7tht3i44m4hNKOnBF/ XcMqKqKaomBvpcHxLKKTaSlUdYnoExXpdSHCQx2w= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726584AbgDIArd (ORCPT ); Wed, 8 Apr 2020 20:47:33 -0400 Received: from mail.kernel.org ([198.145.29.99]:42960 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726536AbgDIArd (ORCPT ); Wed, 8 Apr 2020 20:47:33 -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 0133720757; Thu, 9 Apr 2020 00:47:32 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1586393253; bh=2nhQyL/DP2Bqtl9oIGFAy7+8v5UeTnbKXjY+RkRbpl8=; h=Date:From:To:Cc:Subject:In-Reply-To:References:From; b=roVYxbKcHEORNwh41+mXf7j9wcK3jwv5iCNCc4AcMn2EHwtixACSDrRFahGBlKntG rvYwNqbwPt1aTZjAhJZFhzyytVcw10rC202Fnp4zLWhoxet3CAm2GACn5DRJzqfUCC T7UUxAg7xl1/HwHQXBJ8b3OSLZ460IPHgiOYVQMg= Date: Wed, 8 Apr 2020 17:47:32 -0700 From: Andrew Morton To: Peter Xu Cc: linux-kernel@vger.kernel.org, Linus Torvalds , linux-mm@kvack.org Subject: Re: [PATCH 0/2] mm: Two small fixes for recent syzbot reports Message-Id: <20200408174732.bc448bbe41d190bfe5cc252e@linux-foundation.org> In-Reply-To: <20200408014010.80428-1-peterx@redhat.com> References: <20200408014010.80428-1-peterx@redhat.com> 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 Tue, 7 Apr 2020 21:40:08 -0400 Peter Xu wrote: > The two patches should fix below syzbot reports: > > BUG: unable to handle kernel paging request in kernel_get_mempolicy > https://lore.kernel.org/lkml/0000000000002b25f105a2a3434d@google.com/ > > WARNING: bad unlock balance in __get_user_pages_remote > https://lore.kernel.org/lkml/00000000000005c65d05a2b90e70@google.com/ (Is there an email address for the syzbot operators?) sysbot does test linux-next, yet these patches sat in linux-next for a month without a peep, but all hell broke loose when they hit Linus's tree. How could this have happened? Possibly I've been carrying a later patch which fixed all this up, but I'm not seeing anything like that. Nothing at all against mm/gup.c.