Re: [Qemu-devel] E5-2620v2 - emulation stop error

[Kevin O'Connor <kevin@koconnor.net>]

On Wed, Mar 25, 2015 at 11:43:31PM +0300, Andrey Korolyov wrote:
> On Mon, Mar 16, 2015 at 10:17 PM, Andrey Korolyov <andrey@xdel.ru> wrote:
> > For now, it looks like bug have a mixed Murphy-Heisenberg nature, as
> > it appearance is very rare (compared to the number of actual launches)
> > and most probably bounded to the physical characteristics of my
> > production nodes. As soon as I reach any reproducible path for a
> > regular workstation environment, I`ll let everyone know. Also I am
> > starting to think that issue can belong to the particular motherboard
> > firmware revision, despite fact that the CPU microcode is the same
> > everywhere.
> 
> 
> Hello everyone, I`ve managed to reproduce this issue
> *deterministically* with latest seabios with smp fix and 3.18.3. The
> error occuring just *once* per vm until hypervisor reboots, at least
> in my setup, this is definitely crazy...
> 
> - launch two VMs (Centos 7 in my case),
> - wait a little while they are booting,
> - attach serial console (I am using virsh list for this exact purpose),
> - issue acpi reboot or reset, does not matter,
> - VM always hangs at boot, most times with sgabios initialization
> string printed out [1], but sometimes it hangs a bit later [2],
> - no matter how many times I try to relaunch the QEMU afterwards, the
> issue does not appear on VM which experienced problem once;
> - trace and sample args can be seen in [3] and [4] respectively.

Can you add something like:

  -chardev file,path=seabioslog.`date +%s`,id=seabios -device isa-debugcon,iobase=0x402,chardev=seabios

to the qemu command line and forward the resulting log from both a
succesful boot and a failed one?

-Kevin