[Bug 203837] Booting kernel under KVM immediately freezes host

[bugzilla-daemon@bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=203837

Paul Mackerras (paulus@ozlabs.org) changed:

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                 CC|                            |paulus@ozlabs.org

--- Comment #1 from Paul Mackerras (paulus@ozlabs.org) ---
I have tried but not succeeded in replicating this problem.

I have tried 5.2-rc3 in the host with the config I usually use, plus 5.2-rc3 in
the guest with that same config. That boots just fine.

With 5.2-rc3 in the host and my usual config, and 5.2-rc3 in the guest compiled
with the config attached to this bug, the guest gets a kernel panic due to
being unable to mount root. It looks like it never manages to load virtio-blk
for some reason.

With the config attached to this bug, I did once see the guest stop outputting
messages after the message about bringing up CPUs. The host was still running
just fine, and top in the host showed the qemu-system-ppc64 process using 100%
of a CPU, consistent with the guest being in an infinite loop.

I think we need more details about the machine where the crash is occurring -
host kernel config, details of VM config (qemu command line or libvirt xml),
etc.

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