It seems a kernel bug as your description. And I found some kvm problems fixed in 4.4.4: * Tue Nov 10 2015 Laura Abbott <labbott@xxxxxxxxxx> - 4.4.0-0.rc0.git6.1 - Linux v4.3-9393-gbd4f203 * Tue Nov 10 2015 Josh Boyer <jwboyer@xxxxxxxxxxxxxxxxx> - Fix Yoga 900 rfkill switch issues (rhbz 1275490) - Fix incorrect size calculations in megaraid with 64K pages (rhbz 1269300) - CVE-2015-8104 kvm: DoS infinite loop in microcode DB exception (rhbz 1278496 1279691) - CVE-2015-5307 kvm: DoS infinite loop in microcode AC exception (rhbz 1277172 1279688) ----- Original Message ----- From: "Alexander Petrenz" <petrenz.a@xxxxxxxxx> To: "Han Han" <hhan@xxxxxxxxxx> Cc: libvirt-users@xxxxxxxxxx Sent: Thursday, May 12, 2016 5:22:11 AM Subject: Re: host freeze when starting VM Hi Han, thanks for your reply. I'm using KVM as hypervisor. The versions are: Kernel: 4.5.2 Libvirt: 1.3.4-1 But its quite embarrasing... when I was answering your mail I was having a look if there is a new kernel I can build, since I have to rely on some patches. I upgraded from 4.4.3 to 4.5.2 and now libvirt doesn´t have any problem. So thanks for the heads up! Regards Alex On Tue, May 10, 2016 at 11:18 AM, Han Han <hhan@xxxxxxxxxx> wrote: > Could you tell me you libvirt and kernel version? What is your hypervisor? > Kvm or xen? And hypervisor's version? > > ----- Original Message ----- > From: "Alexander Petrenz" <petrenz.a@xxxxxxxxx> > To: libvirt-users@xxxxxxxxxx > Sent: Saturday, May 7, 2016 5:37:41 AM > Subject: host freeze when starting VM > > Hi together, > > when I´m starting a VM my host freezes gradually. This seems to happen > because its running out of memory and no other process is able to do > anything. > I have 16GB of ram in total. 8GB are reserved for hugepages. So for the > daily business on the host I have 8GB left. I don´t run many or > extraordinary consuming software on the host - normally just a gnome > session and the chromium browser. Right now htop tells me that 10.1 of 15.4 > GB are occupied, so that should be about 2GB, because I suppose 8GB are > just reserved for the hugepages. I don´t have any swap space. > > In my latest attempt I gave a newly created VM 64MB of ram and this also > brought the system down to its knees. So I would like to understand why > this is happening. Is it some configuration issue I'm not aware of or maybe > even some bug? Can someone give any idea on this? > > Thanks in advance > Alex > > _______________________________________________ > libvirt-users mailing list > libvirt-users@xxxxxxxxxx > https://www.redhat.com/mailman/listinfo/libvirt-users > _______________________________________________ libvirt-users mailing list libvirt-users@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/libvirt-users
