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=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_PASS autolearn=ham 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 40498C43441 for ; Wed, 10 Oct 2018 22:07:20 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id EAC9A2087A for ; Wed, 10 Oct 2018 22:07:19 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org EAC9A2087A Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=xmission.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726016AbeJKFb0 (ORCPT ); Thu, 11 Oct 2018 01:31:26 -0400 Received: from out01.mta.xmission.com ([166.70.13.231]:51711 "EHLO out01.mta.xmission.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725949AbeJKFb0 (ORCPT ); Thu, 11 Oct 2018 01:31:26 -0400 Received: from in02.mta.xmission.com ([166.70.13.52]) by out01.mta.xmission.com with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.87) (envelope-from ) id 1gAMdQ-0004O6-Pz; Wed, 10 Oct 2018 16:07:16 -0600 Received: from 67-3-154-154.omah.qwest.net ([67.3.154.154] helo=x220.xmission.com) by in02.mta.xmission.com with esmtpsa (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.87) (envelope-from ) id 1gAMdB-00086K-Fd; Wed, 10 Oct 2018 16:07:16 -0600 From: ebiederm@xmission.com (Eric W. Biederman) To: kernel test robot Cc: linux-kernel@vger.kernel.org, LKP References: <20181010020641.GE13396@shao2-debian> <87sh1dvmc5.fsf@xmission.com> Date: Wed, 10 Oct 2018 17:06:52 -0500 In-Reply-To: <87sh1dvmc5.fsf@xmission.com> (Eric W. Biederman's message of "Wed, 10 Oct 2018 10:43:38 -0500") Message-ID: <87h8htv4lf.fsf@xmission.com> User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/25.1 (gnu/linux) MIME-Version: 1.0 Content-Type: text/plain X-XM-SPF: eid=1gAMdB-00086K-Fd;;;mid=<87h8htv4lf.fsf@xmission.com>;;;hst=in02.mta.xmission.com;;;ip=67.3.154.154;;;frm=ebiederm@xmission.com;;;spf=neutral X-XM-AID: U2FsdGVkX1+C8+NQGdDit9eMbrncDKOBGWSbptvxYsE= X-SA-Exim-Connect-IP: 67.3.154.154 X-SA-Exim-Mail-From: ebiederm@xmission.com Subject: Re: [LKP] 4ce5f9c9e7 [ 1.323881] WARNING: CPU: 0 PID: 1 at mm/slab_common.c:1031 kmalloc_slab X-SA-Exim-Version: 4.2.1 (built Thu, 05 May 2016 13:38:54 -0600) X-SA-Exim-Scanned: Yes (on in02.mta.xmission.com) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org ebiederm@xmission.com (Eric W. Biederman) writes: > So I am flummoxed. I am reading through the code and I don't see > anything that could trigger this, and when I ran the supplied reproducer > it did not reproduce for me. Even more so. With my tool chain the line that reports the failing address is impossible. [ 73.034423] RIP: 0010:copy_siginfo_from_user+0x4d/0xd0 With the supplied configureation my tool chain only has 0x30 bytes for all of copy_siginfo_from_user. So I can't even begin to guess where in that function things are failing. Any additional information that you can provide would be a real help in tracking down this strange failure. Thank you, Eric Biederman