KVM guest dropping dead

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KVM guest dropping dead

Karl Auer
Does anyone have a clue as to why this might happen? A KVM guest just
dies, with no warning (though sometimes it hangs for a few seconds
first). The only thing in the logs is this:

2020-11-07 04:32:24.907+0000: shutting down, reason=crashed

It may last hours, sometimes it only lasts a few minutes.

Is there any way to debug this?

Regards, K.

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Re: KVM guest dropping dead

Robert Heller
At Sat, 07 Nov 2020 15:54:12 +1100 [hidden email], "Ubuntu user technical support,  not for general discussions" <[hidden email]> wrote:

>
> Does anyone have a clue as to why this might happen? A KVM guest just
> dies, with no warning (though sometimes it hangs for a few seconds
> first). The only thing in the logs is this:
>
> 2020-11-07 04:32:24.907+0000: shutting down, reason=crashed

Exactly what O/S is the guest running?  What "hardware" is being
used or simulated?  How much memory is allocated to the guest?  How many
cores?

>
> It may last hours, sometimes it only lasts a few minutes.
>
> Is there any way to debug this?
>
> Regards, K.
>

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Re: KVM guest dropping dead

Karl Auer
On Sat, 2020-11-07 at 08:02 -0500, Robert Heller wrote:
> > Does anyone have a clue as to why this might happen? A KVM guest
> > just dies, with no warning
> > [...]
> > 2020-11-07 04:32:24.907+0000: shutting down, reason=crashed
>
> Exactly what O/S is the guest running?  What "hardware" is being
> used or simulated?  How much memory is allocated to the guest?  How
> many cores?

Running on on Intel i7 6 cores, allocated one core (KVM reports 2
because two threads) with 4GB RAM. Skylake-Client-IBRS. Running default
networking, so NAT.

x86_64, /usr/bin/qemu-system-x86_64, Q35, BIOS, default "hardware".

Was more interested in an answer to the question "Is there any way to
debug this?"

Thanks, K.

PS: Rebooted the host and the guest hasn't died since...

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Re: KVM guest dropping dead

Robert Heller
At Sun, 08 Nov 2020 07:53:14 +1100 [hidden email], "Ubuntu user technical support,  not for general discussions" <[hidden email]> wrote:

>
> On Sat, 2020-11-07 at 08:02 -0500, Robert Heller wrote:
> > > Does anyone have a clue as to why this might happen? A KVM guest
> > > just dies, with no warning
> > > [...]
> > > 2020-11-07 04:32:24.907+0000: shutting down, reason=crashed
> >
> > Exactly what O/S is the guest running?  What "hardware" is being
> > used or simulated?  How much memory is allocated to the guest?  How
> > many cores?
>
> Running on on Intel i7 6 cores, allocated one core (KVM reports 2
> because two threads) with 4GB RAM. Skylake-Client-IBRS. Running default
> networking, so NAT.
>
> x86_64, /usr/bin/qemu-system-x86_64, Q35, BIOS, default "hardware".
>
> Was more interested in an answer to the question "Is there any way to
> debug this?"

What O/S is the *GUEST* running?  That is, what O/S did you install in the
guest?

>
> Thanks, K.
>
> PS: Rebooted the host and the guest hasn't died since...
>

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Re: KVM guest dropping dead

Karl Auer
On Sat, 2020-11-07 at 16:38 -0500, Robert Heller wrote:
> What O/S is the *GUEST* running?  That is, what O/S did you install
> in the guest?

Ubuntu 20.04, host and guest. Both fully upgraded.

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