On 11/10/13 18:17, Christoffer Dall wrote: > On Wed, Oct 09, 2013 at 12:00:39PM +0100, Will Deacon wrote: >> On Thu, Sep 12, 2013 at 04:27:16PM +0100, Christoffer Dall wrote: >>> On Thu, Sep 12, 2013 at 10:37:50AM +0100, Will Deacon wrote: >>>> On Fri, Sep 06, 2013 at 05:30:52PM +0100, Will Deacon wrote: >>>>> Running trinity as a normal user in a KVM guest on my TC2 (A15s only) >>>>> eventually leads to a situation where responsiveness is extremely sluggish. >>>>> Further investigation shows that issuing a `sleep 1' command never returns. >>>>> This seems to be because the virtual timer has stopped generating interrupts >>>>> on CPU0 (CPU1 seems ok). >>>>> >>>>> Dumping the timer state (see below), it looks like CPU0's timer expired in >>>>> the past, but we're perhaps not receiving the interrupt. The trinity logs >>>>> don't reveal anything obvious (and they're huge, so I can't include them >>>>> here). >>>>> >>>>> I can reproduce this in an hour or so, so if you want me to try anything out >>>>> in the host, I can give it a go. I'm using 3.11 as both the guest and host. >>>> >>>> Any ideas on things I can do to get to the bottom of this? It's preventing >>>> me from running trinity to find any other issues and there's no reason you >>>> couldn't hit this lockup under other workloads. >>>> >>> I've been thinking on this, sorry about the late response. >>> >>> I see something similar when resuming a suspended guest, but I don't >>> have very clever ideas or debug strategies yet. I plan on looking at >>> this once I get a new revision of the save/restore QEMU patches out. >> >> Marc was saying that you'd managed to resolve the issue with suspend, but I >> can still reproduce the issue with trinity on a 3.12-rc4 kernel (host and >> guest). > > Yeah, that issue turned out to be simply overwriting the restored > counter values. I need to look at this some more, still present in my > todo list... > >> >> I tried to reproduce in a model, but I ran into a bunch of other unrelated >> problems that look like bugs in the model itself. >> > Great... I have a TC2 running, trying to catch the sucker. Haven't observed it yet after a day, very annoying. M. -- Jazz is not dead. It just smells funny... _______________________________________________ kvmarm mailing list kvmarm@xxxxxxxxxxxxxxxxxxxxx https://lists.cs.columbia.edu/cucslists/listinfo/kvmarm
