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Linux kernel hangs rarely when booting on the latest qemu
Description of problem:
(Downstream bug: https://bugzilla.redhat.com/show_bug.cgi?id=2213346)
In Fedora we have noticed that the latest Linux kernel (rarely) hangs when booting
on the latest qemu. It hangs after printing:
```
[ 0.070120] x86/cpu: User Mode Instruction Prevention (UMIP) activated
[ 0.070120] Last level iTLB entries: 4KB 512, 2MB 255, 4MB 127
[ 0.070120] Last level dTLB entries: 4KB 512, 2MB 255, 4MB 127, 1GB 0
[ 0.070120] Spectre V1 : Mitigation: usercopy/swapgs barriers and __user pointer sanitization
[ 0.070120] Spectre V2 : Mitigation: Retpolines
[ 0.070120] Spectre V2 : Spectre v2 / SpectreRSB mitigation: Filling RSB on context switch
[ 0.070120] Spectre V2 : Spectre v2 / SpectreRSB : Filling RSB on VMEXIT
[ 0.070120] Spectre V2 : Enabling Speculation Barrier for firmware calls
[ 0.070120] RETBleed: Mitigation: untrained return thunk
[ 0.070120] Spectre V2 : mitigation: Enabling conditional Indirect Branch Prediction Barrier
[ 0.070120] Speculative Store Bypass: Mitigation: Speculative Store Bypass disabled via prctl
[ 0.070120] Freeing SMP alternatives memory: 48K
```
The next line which would be printed (if it didn't hang) is:
```
[ 0.070794] smpboot: CPU0: AMD Ryzen 9 3900X 12-Core Processor (family: 0x17, model: 0x71, stepping: 0x0)
```
We've seen this hang on both AMD and Intel. It probably happens one in every 300 boots.
Steps to reproduce:
By far the easiest way to reproduce this is to just run guestfish in a loop:
```
$ while guestfish -a /dev/null -v run >& /tmp/log; do echo -n . ; done
```
Additional information:
The full qemu command is rather long but you can find it in this log file:
https://bugzilla-attachments.redhat.com/attachment.cgi?id=1969620
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