From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mout1.freenet.de ([195.4.92.91]:46310 "EHLO mout1.freenet.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753001AbaIXRTk (ORCPT ); Wed, 24 Sep 2014 13:19:40 -0400 Message-ID: <5422FC84.9060101@maya.org> Date: Wed, 24 Sep 2014 19:16:52 +0200 From: Andreas Hartmann MIME-Version: 1.0 To: Alex Williamson CC: linux-pci Subject: Re: Hard and silent lock up since linux 3.14 with PCIe pass through (vfio) References: <20140923210318.498dacbd@dualc.maya.org> <1411502866.24563.8.camel@ul30vt.home> <5422DB3B.9070502@maya.org> In-Reply-To: <5422DB3B.9070502@maya.org> Content-Type: text/plain; charset=UTF-8 Sender: linux-pci-owner@vger.kernel.org List-ID: Andreas Hartmann wrote: > Alex Williamson wrote: [...] >> Are you able to setup a serial console on this system? Enabling sysrq >> and getting a dump of task states (t) via serial is often the best way >> to determine the problem. > > I'll try it. I did it now like this: minicom on the client. Magic SysKeyRequest via minicom: Ctrl-A shift-f [Syskey, like m or t, ...] On the sender: As kerneloption: console=tty0 console=ttyS0,115200n8 Before, you have to enable syskeyrequest via sysctl -w kernel.sysrq=1 After doing all of this, you can test w/ m or t. The output will appear on tty9 (via Alt-F10 on openSUSE). But what was the result after starting the VM? -> Machine is definitely completely dead. It doesn't react on anything any more. Remarkable: After hard reset, the USB keyboard doesn't work any more in Linux (but in Grub 2), because the driver gets a timeout accessing the USB 3 hw (other USB chips are working fine). It is necessary to switch of the machine completely and remove the mains. After ~ 30s, it can be repowered and all is working fine again (after repairing the broken FS the VM resides on the host). Any more hints are welcome :-) Thanks, kind regards, Andreas