From: Peter Lieven <pl@dlhnet.de>
To: Marcelo Tosatti <mtosatti@redhat.com>
Cc: Peter Lieven <pl@dlh.net>, qemu-devel@nongnu.org, kvm@vger.kernel.org
Subject: Re: [Qemu-devel] race condition in qemu-kvm-1.0.1
Date: Wed, 04 Jul 2012 12:03:58 +0200 [thread overview]
Message-ID: <4FF4150E.2030201@dlhnet.de> (raw)
In-Reply-To: <20120703155430.GA21571@amt.cnet>
On 07/03/12 17:54, Marcelo Tosatti wrote:
> On Wed, Jun 27, 2012 at 12:35:22PM +0200, Peter Lieven wrote:
>> Hi,
>>
>> we recently came across multiple VMs racing and stopping working. It
>> seems to happen when the system is at 100% cpu.
>> One way to reproduce this is:
>> qemu-kvm-1.0.1 with vnc-thread enabled
>>
>> cmdline (or similar):
>> /usr/bin/qemu-kvm-1.0.1 -net
>> tap,vlan=141,script=no,downscript=no,ifname=tap15,vnet_hdr -net
>> nic,vlan=141,model=virtio,macaddr=52:54:00:ff:00:f7 -drive format=host_device,file=/dev/mapper/iqn.2001-05.com.equallogic:0-8a0906-efdf4e007-16700198c7f4fead-02-debug-race-hd01,if=virtio,cache=none,aio=native
>> -m 2048 -smp 2,sockets=1,cores=2,threads=1 -monitor
>> tcp:0:4026,server,nowait -vnc :26 -qmp tcp:0:3026,server,nowait
>> -name 02-debug-race -boot order=dc,menu=off -cdrom
>> /home/kvm/cdrom//root/ubuntu-12.04-server-amd64.iso -k de -pidfile
>> /var/run/qemu/vm-221.pid -mem-prealloc -cpu
>> host,+x2apic,model_id=Intel(R) Xeon(R) CPU L5640 @
>> 2.27GHz,-tsc -rtc base=utc -usb -usbdevice tablet -no-hpet -vga
>> cirrus
> Is it reproducible without vnc thread enabled?
Yes, it is. I tried it with and without. It is also even happnig with
0.12.5 where
no vnc thread (and i think also iothread) is available.
Thanks,
Peter
next prev parent reply other threads:[~2012-07-04 10:04 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <4FEAE1EA.3070107@dlh.net>
2012-07-03 15:54 ` [Qemu-devel] race condition in qemu-kvm-1.0.1 Marcelo Tosatti
2012-07-04 10:03 ` Peter Lieven [this message]
2012-07-05 2:02 ` Marcelo Tosatti
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