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From: Andreas Hartmann <andihartmann@freenet.de>
To: Alex Williamson <alex.williamson@redhat.com>
Cc: linux-pci <linux-pci@vger.kernel.org>
Subject: Re: Hard and silent lock up since linux 3.14 with PCIe pass through (vfio)
Date: Wed, 24 Sep 2014 19:16:52 +0200
Message-ID: <5422FC84.9060101@maya.org> (raw)
In-Reply-To: <5422DB3B.9070502@maya.org>

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

  reply index

Thread overview: 42+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2014-09-23 19:03 Andreas Hartmann
2014-09-23 20:07 ` Alex Williamson
2014-09-24 14:54   ` Andreas Hartmann
2014-09-24 17:16     ` Andreas Hartmann [this message]
2014-10-10  9:39   ` Andreas Hartmann
2014-10-10 14:37     ` Bjorn Helgaas
2014-10-10 14:49       ` Andreas Hartmann
2014-10-10 15:55         ` Bjorn Helgaas
2014-10-10 16:09           ` Andreas Hartmann
2014-10-10 16:41             ` Bjorn Helgaas
2014-10-10 22:32               ` Andreas Hartmann
2014-10-10 22:54                 ` Bjorn Helgaas
2014-10-11  6:20                   ` Andreas Hartmann
2014-10-15  8:04                     ` Alex Williamson
2014-10-17  1:04                       ` Andreas Hartmann
2014-10-21 21:06                         ` Alex Williamson
2014-10-21 21:32                           ` Alex Williamson
2014-10-22 16:22                             ` Andreas Hartmann
2014-10-22 20:36                               ` Alex Williamson
2014-10-23 16:00                                 ` Andreas Hartmann
2014-10-23 16:33                                   ` Alex Williamson
2014-10-23 17:12                                     ` Andreas Hartmann
2014-10-23 17:33                                     ` Andreas Hartmann
2014-10-23 19:37                                       ` Alex Williamson
2014-10-24 14:21                                         ` Andreas Hartmann
2014-10-25  6:03                                         ` Andreas Hartmann
2014-10-28 21:51                                           ` Alex Williamson
2014-10-29 16:47                                             ` Andreas Hartmann
2014-10-29 17:44                                               ` Alex Williamson
2014-10-29 17:57                                                 ` Andreas Hartmann
2014-10-29 18:16                                                   ` Alex Williamson
2014-10-29 19:43                                                     ` Andreas Hartmann
2014-10-29 20:50                                                       ` Alex Williamson
2014-10-29 21:35                                                         ` Andreas Hartmann
2014-10-30 16:35                                                         ` Andreas Hartmann
2014-10-30 16:58                                                           ` Alex Williamson
2014-10-30 19:09                                                             ` Andreas Hartmann
2014-10-30 19:45                                                               ` Alex Williamson
2014-10-30 20:21                                                                 ` Andreas Hartmann
2014-10-22 15:34                           ` Andreas Hartmann
2014-10-22 16:02                             ` Alex Williamson
2014-10-22 16:20                               ` Andreas Hartmann

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