[Bug 211109] New: Hard kernel freeze due to large cpu allocation.

[bugzilla-daemon@bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=211109

            Bug ID: 211109
           Summary: Hard kernel freeze due to large cpu allocation.
           Product: Virtualization
           Version: unspecified
    Kernel Version: 5.9.9-95-tkg-MuQSS-llvm
          Hardware: All
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: kvm
          Assignee: virtualization_kvm@kernel-bugs.osdl.org
          Reporter: vytautas.mickus.exc@gmail.com
        Regression: No

Allocating a large amount of vcpu (30,31) on a system with 32 threads (16 core
ryzen 3950x) causes hard freeze of the whole system. While 16-17 vcpu
allocation is fine.

This was seen while using minikube
```
minikube start --cni=calico --container-runtime=cri-o --cpus=$(($(nproc) - 1))
--driver=kvm2 -n 3
```

Last journal entry is:
```
Jan 10 10:14:51 rig libvirtd[2269]: operation failed: domain 'minikube' already
exists with uuid 4aacd29f-bd5f-418d-b267-42b79f75fbab
```
At which point minikube sees that the domain already exists and launches it.
Hard freeze is immediate.

OS:
Linux rig 5.9.9-95-tkg-MuQSS-llvm #1 TKG SMP PREEMPT Sun, 22 Nov 2020 07:41:26
+0000 x86_64 GNU/Linux

os-release:
```
NAME="Arch Linux"
PRETTY_NAME="Arch Linux"
ID=arch
BUILD_ID=rolling
```

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