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[209.132.180.67]) by mx.google.com with ESMTP id v6si4279407oif.149.2020.03.13.00.44.39; Fri, 13 Mar 2020 00:44:51 -0700 (PDT) Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67; Authentication-Results: mx.google.com; dkim=pass header.i=@google.com header.s=20161025 header.b=h+sI1cXC; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=REJECT sp=REJECT dis=NONE) header.from=google.com Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726462AbgCMHn2 (ORCPT + 99 others); Fri, 13 Mar 2020 03:43:28 -0400 Received: from mail-qk1-f193.google.com ([209.85.222.193]:33442 "EHLO mail-qk1-f193.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726442AbgCMHn1 (ORCPT ); Fri, 13 Mar 2020 03:43:27 -0400 Received: by mail-qk1-f193.google.com with SMTP id p62so11002317qkb.0 for ; Fri, 13 Mar 2020 00:43:27 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20161025; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=iXhlxw0H0UxInHwvt9KvKKCMEzPCeaquOmuSCkPzud0=; b=h+sI1cXCwzNduk1+KPxBrjiJYQOJhEB0mg1jOSbiThtaXOYgLygUPLsJgyMcUYqjgN JUhe/9+M6vPYo6QxRjrb7XxaaKIXzWSrJvpBCUY4cr+hKbHf6WWVLJcNum9L9BX1TSbj atglcrYR1CPrbvpeHJXv7Yo+tQgF0kymGjZVklcE1ySLXGlRZkM9xpvdx+Dtgomy8kw0 G0cw2y/3vUPPdmR3MVQNQ2VY1pG2dEg+gubS/G41CgwXMuM8OKYVID8wN/xWZ1/LNHN7 hCb7LIoRr46x0wc/6etuKcGD/SON+kvqoNPb6f63krKPo74VXCScmYWaLgyaIPSQ9+M7 cNuA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=iXhlxw0H0UxInHwvt9KvKKCMEzPCeaquOmuSCkPzud0=; b=ZoYEGdGMHHUh6R6KT/1ntll/LwypSg3HCq1SJas6fmDiPyRkZ1IxpP3U580Vj7K7Wh W7LgpXxhaX0+1WgFEwp2vsRzsohap0Y+VZvorFi46/wpWXuSRzxIiGG6CjRPA8Gei9kQ 2c4ckcHaDAMTTq4aEGUpKuZXij+39bl0UMDfatXjT6/ptRjL6aZAsvHOqiWbreHRTOMk yR9SYJKJ2PPSM2wYBKvx0A3tMvUJW9OnGJXNUZgv6x31y3SFxKrnxzySIOSnHKTdlXPM PdmtGX/p1kjKQ1gmE6u1tBOxPTPE+Cs3HFIZQY0j/S41ShFk0gsiV24F7fPrTqlcfncY 4hVg== X-Gm-Message-State: ANhLgQ2kpBmFHjA+iivD/RFAL60jja2gW3ORTYLYTZ0YFlPrdNBf4v8K zFcujI7iGT61CjcH2zCu6u+WIyCJ0+5uSO15gzvsTQ== X-Received: by 2002:ae9:e003:: with SMTP id m3mr11947751qkk.250.1584085406355; Fri, 13 Mar 2020 00:43:26 -0700 (PDT) MIME-Version: 1.0 References: <000000000000eb546f0570e84e90@google.com> <20180713145811.683ffd0043cac26a5a5af725@linux-foundation.org> <5f715c98-2b81-4eee-be3c-11cbc1bc36a8@googlegroups.com> In-Reply-To: From: Dmitry Vyukov Date: Fri, 13 Mar 2020 08:43:15 +0100 Message-ID: Subject: Re: unexpected kernel reboot (3) To: Jim Mattson Cc: syzkaller-bugs , LKML , syzbot Content-Type: text/plain; charset="UTF-8" Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Thu, Mar 12, 2020 at 9:36 PM Jim Mattson wrote: > > On Wed, Mar 11, 2020 at 1:35 PM Jim Mattson wrote: > > > > On Wed, Mar 11, 2020 at 1:18 PM Dmitry Vyukov wrote: > > > > > This happened 10K+ times. > > > If GCE VM is rebooted by doing something with KVM subsystem, I assume > > > it's a GCE bug (?). +Jim > > > > The L1 guest may have done something that's unsupported, or it may > > just be a bug in the L0 hypervisor. > > I can't reproduce this in GCE with the collateral provided. As far as I understand, this may depend on GCE host kernel and/or host CPU, right? Do we have an ability to unit test on all combinations? Looking at the rate and reproducers on the dashboard I see interesting patterns. Perhaps the best time to try to reproduce is these periods when syzbot comes up with lots of reproducers. But it's not now...