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Re: [Qemu-devel] kernel 4.4.2: kvm_irq_delivery_to_api / rwsem_down_read
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From: |
Paolo Bonzini |
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Subject: |
Re: [Qemu-devel] kernel 4.4.2: kvm_irq_delivery_to_api / rwsem_down_read_failed |
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Date: |
Mon, 22 Feb 2016 14:44:23 -0500 (EST) |
----- Original Message -----
> From: "Stefan Priebe" <address@hidden>
> To: "Paolo Bonzini" <address@hidden>, "qemu-devel" <address@hidden>,
> address@hidden
> Sent: Monday, February 22, 2016 8:35:41 PM
> Subject: Re: kernel 4.4.2: kvm_irq_delivery_to_api / rwsem_down_read_failed
>
>
> Am 22.02.2016 um 18:36 schrieb Paolo Bonzini:
> >
> >
> > On 20/02/2016 11:44, Stefan Priebe wrote:
> >> Hi,
> >>
> >> while testing Kernel 4.4.2 and starting 20 Qemu 2.4.1 virtual machines.
> >> I got those traces and a load of 500 on those system. I was only abler
> >> to recover by sysrq-trigger.
> >
> > It seems like something happening at the VM level. A task took the mm
> > semaphore and hung everyone else. Difficult to debug without a core
> > (and without knowing who held the semaphore). Sorry.
>
> OK thank you anyway. Is there anything i can do if this happens again?
Try grabbing a vmcore with sysrq-c, if you have kdump configured.
Paolo