From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753619AbcKNOpd (ORCPT ); Mon, 14 Nov 2016 09:45:33 -0500 Received: from mail-wm0-f68.google.com ([74.125.82.68]:35789 "EHLO mail-wm0-f68.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752558AbcKNOp3 (ORCPT ); Mon, 14 Nov 2016 09:45:29 -0500 Subject: Re: kvm: WARNING in kvm_arch_vcpu_ioctl_run To: Dmitry Vyukov , syzkaller References: <2c7f4ed6-99af-afef-6d71-40a1f16b8f21@redhat.com> Cc: =?UTF-8?B?UmFkaW0gS3LEjW3DocWZ?= , Thomas Gleixner , Ingo Molnar , "H. Peter Anvin" , "x86@kernel.org" , KVM list , LKML , Steve Rutherford From: Paolo Bonzini Message-ID: <8a829321-d79e-95fb-9df6-db032fb78305@redhat.com> Date: Mon, 14 Nov 2016 15:45:22 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Thunderbird/45.4.0 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 14/11/2016 15:09, Dmitry Vyukov wrote: > > I made dump_vmcs() no-op locally. You should see the warning > regardless, but probably it is difficult to notice. Or maybe tons of > output affect timings so that the warning does not happen. I let it run for several minutes, and only got 50 splats out of several thousand iterations. Reproducing is not going to help much anyway---if we can get to the root cause, writing a reliable reproducer would be easier anyway. Paolo