From mboxrd@z Thu Jan 1 00:00:00 1970 From: Tejun Heo Subject: Re: PROBLEM: NULL pointer dereference in kernel 4.14.6 Date: Tue, 19 Dec 2017 14:37:04 -0800 Message-ID: <20171219223704.GS3919388@devbig577.frc2.facebook.com> References: <1513628274.1378.1.camel@gmail.com> Mime-Version: 1.0 Return-path: DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=sender:date:from:to:cc:subject:message-id:references:mime-version :content-disposition:in-reply-to:user-agent; bh=Jgt2G+fppPVkfGzSjw5B479ECfeOjHC7CalJUmwtPMQ=; b=YyA01+Dr4iXwEnEmZ3mJWU8e0ZQ3OghGePf9VThpbwCMqXMTc0EEigucbMFSgPpL7x aQzS990JDZD5dYmsWPtA9210cpKCTOU39YSCvqulB2cwbY5Tnb7ca3zCKXayLKKggk2/ WsewntPAOolhv2cX8JULT7VpnbCAK7/uKRuP9YjCVzDb5jzmn6/cX1iFw1DixOzZW6F5 J9aO9Qxw4xbgkBJ4nw1bdzI05TTEg15KZtl9oWe71t/NXuJxAAFqRnTCOOx8Ng5ItW9z bQTkMxnwNiTuwJs1QbxLZmOwetPuxWNt3wP5RWmOaorxsgm9q5b9qU9fsDfYn1PfEbQs RtIw== Content-Disposition: inline In-Reply-To: <1513628274.1378.1.camel-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> Sender: cgroups-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org List-ID: Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: George Amanakis Cc: linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, cgroups-u79uwXL29TY76Z2rM5mHXA@public.gmane.org Hello, On Mon, Dec 18, 2017 at 03:17:54PM -0500, George Amanakis wrote: > I can replicate this on a Thinkpad X230i running archlinux with latest > 4.14.7 kernel, without the ZFS modules. > > Steps to reproduce: > 1) create a virtual machine using libvirt (attached xml) > 2) virsh start vm > 3) head /sys/fs/cgroup/unified/machine.slice/machine- > qemu\\x2d2\\x2dvm.scope/cgroup.procs It took some massaging but I can reproduce the problem. Will report when I know more. Thanks. -- tejun From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753405AbdLSWhZ (ORCPT ); Tue, 19 Dec 2017 17:37:25 -0500 Received: from mail-qk0-f193.google.com ([209.85.220.193]:32907 "EHLO mail-qk0-f193.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751820AbdLSWhI (ORCPT ); Tue, 19 Dec 2017 17:37:08 -0500 X-Google-Smtp-Source: ACJfBou9Gz7KFCzNSkyNDvozisX2O5H39itY8BigS66qDyuNKpOVQTRvwPuVm/ZsfkEyGP7Duc/g0w== Date: Tue, 19 Dec 2017 14:37:04 -0800 From: Tejun Heo To: George Amanakis Cc: linux-kernel@vger.kernel.org, cgroups@vger.kernel.org Subject: Re: PROBLEM: NULL pointer dereference in kernel 4.14.6 Message-ID: <20171219223704.GS3919388@devbig577.frc2.facebook.com> References: <1513628274.1378.1.camel@gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1513628274.1378.1.camel@gmail.com> User-Agent: Mutt/1.5.21 (2010-09-15) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hello, On Mon, Dec 18, 2017 at 03:17:54PM -0500, George Amanakis wrote: > I can replicate this on a Thinkpad X230i running archlinux with latest > 4.14.7 kernel, without the ZFS modules. > > Steps to reproduce: > 1) create a virtual machine using libvirt (attached xml) > 2) virsh start vm > 3) head /sys/fs/cgroup/unified/machine.slice/machine- > qemu\\x2d2\\x2dvm.scope/cgroup.procs It took some massaging but I can reproduce the problem. Will report when I know more. Thanks. -- tejun