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=-3.9 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,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 73770C2D0A3 for ; Thu, 29 Oct 2020 15:23:01 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id CABD12076E for ; Thu, 29 Oct 2020 15:23:00 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="cTzuWwFi" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org CABD12076E Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=redhat.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id 1E1BC6B0062; Thu, 29 Oct 2020 11:23:00 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 193086B006C; Thu, 29 Oct 2020 11:23:00 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 05AA86B0073; Thu, 29 Oct 2020 11:23:00 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0239.hostedemail.com [216.40.44.239]) by kanga.kvack.org (Postfix) with ESMTP id CB0366B0062 for ; Thu, 29 Oct 2020 11:22:59 -0400 (EDT) Received: from smtpin09.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay01.hostedemail.com (Postfix) with ESMTP id 6A989180AD801 for ; Thu, 29 Oct 2020 15:22:59 +0000 (UTC) X-FDA: 77425330878.09.pan26_2513f102728e Received: from filter.hostedemail.com (10.5.16.251.rfc1918.com [10.5.16.251]) by smtpin09.hostedemail.com (Postfix) with ESMTP id 4A753180AD815 for ; Thu, 29 Oct 2020 15:22:59 +0000 (UTC) X-HE-Tag: pan26_2513f102728e X-Filterd-Recvd-Size: 3606 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [63.128.21.124]) by imf11.hostedemail.com (Postfix) with ESMTP for ; Thu, 29 Oct 2020 15:22:58 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1603984978; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=/Al7jp2KpP7xzeYyJvl4kdrGITzq6+8+5JYXBgDyWCo=; b=cTzuWwFiP1bRfXXMFkYjKVeGaHqK07B3c5s0sSr15zSd14xYuBvdsstTt5KQdf3AZ77M8x EkZIDl6W9XT1/KKvn0cqJibYRsXxQluJLmI+6FM+M6aFirZpOuIGzSjNC85bIVD/pJBN0L BbYz5q+X/BYgfHdu7xafYx6MJ5uKtyI= Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-486-znaByWPQPxCEG12-0RLm2Q-1; Thu, 29 Oct 2020 11:22:55 -0400 X-MC-Unique: znaByWPQPxCEG12-0RLm2Q-1 Received: from smtp.corp.redhat.com (int-mx05.intmail.prod.int.phx2.redhat.com [10.5.11.15]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 685DF107AFA5; Thu, 29 Oct 2020 15:22:54 +0000 (UTC) Received: from tarantula.users.ipa.redhat.com (ovpn-115-106.rdu2.redhat.com [10.10.115.106]) by smtp.corp.redhat.com (Postfix) with ESMTPS id 48F5955766; Thu, 29 Oct 2020 15:22:53 +0000 (UTC) Date: Thu, 29 Oct 2020 10:22:51 -0500 From: Jeffrey Bastian To: Andrew Morton Cc: bugzilla-daemon@bugzilla.kernel.org, linux-mm@kvack.org, Kees Cook , Al Viro , Colin Ian King Subject: Re: [Bug 209919] New: kernel BUG at mm/usercopy.c:99 from stress-ng procfs Message-ID: <20201029152251.ls2wifd7rtczfvcc@tarantula.users.ipa.redhat.com> References: <20201028163611.2d2cf82c0919ca4018741c97@linux-foundation.org> MIME-Version: 1.0 In-Reply-To: <20201028163611.2d2cf82c0919ca4018741c97@linux-foundation.org> X-Scanned-By: MIMEDefang 2.79 on 10.5.11.15 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=jbastian@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Type: text/plain; charset=us-ascii; format=flowed Content-Disposition: inline X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On Wed, Oct 28, 2020 at 04:36:11PM -0700, Andrew Morton wrote: >(switched to email. Please respond via emailed reply-to-all, not via the >bugzilla web interface). > >On Wed, 28 Oct 2020 15:49:15 +0000 bugzilla-daemon@bugzilla.kernel.org wrote: >> [ 984.279683] Call Trace: >> [ 984.282581] __check_heap_object+0xe0/0x110 >> [ 984.287405] __check_object_size+0x136/0x150 >> [ 984.292347] proc_sys_call_handler+0x167/0x250 >> [ 984.297565] new_sync_read+0x108/0x180 >> [ 984.302082] vfs_read+0x174/0x1d0 >> [ 984.306126] ksys_read+0x58/0xd0 >> [ 984.310022] do_syscall_64+0x33/0x40 >> [ 984.314277] entry_SYSCALL_64_after_hwframe+0x44/0xa9 > >Can we determine which /proc/sys entries these are? Colin Ian King narrowed it down to /proc/sys/kernel/sched_domain/cpu0/domain0/flags and commit 5b9f8ff7b320a34af3dbcf04edb40d9b04f22f4a. He has a proposed patch, too, that he'll be sending to the list soon. See https://bugzilla.kernel.org/show_bug.cgi?id=209919#c9 Thanks for the quick debugging, Colin! -- Jeff Bastian Kernel QE - Hardware Enablement Red Hat