Re: Random boot failures with multiple CPUs in VirtualBox

[RVP <rvp%SDF.ORG@localhost>]

On Sun, 10 Apr 2022, Roland Illig wrote:

> I shut down the VM, increased the CPUs to 4 and started the VM. Booting
> did not succeed, the last message is:
>
> [1.0369161] apcicpu3 at cpu3: ACPI CPU
>
> [...]
>
> Are these known problems?

I see that once in a while on real HW too:
```
cpu0: Intel(R) Core(TM) i3-3217U CPU @ 1.80GHz, id 0x306a9
cpu0: node 0, package 0, core 0, smt 0
cpu1 at mainbus0 apid 2
cpu1: Intel(R) Core(TM) i3-3217U CPU @ 1.80GHz, id 0x306a9
cpu1: node 0, package 0, core 1, smt 0
cpu2 at mainbus0 apid 1
cpu2: Intel(R) Core(TM) i3-3217U CPU @ 1.80GHz, id 0x306a9
cpu2: node 0, package 0, core 0, smt 1
cpu3 at mainbus0 apid 3
cpu3: Intel(R) Core(TM) i3-3217U CPU @ 1.80GHz, id 0x306a9
cpu3: node 0, package 0, core 1, smt 1
```

Stops at the same place:
```
coretemp0 at cpu0: thermal sensor, 1 C resolution, Tjmax=105
acpicpu1 at cpu1: ACPI CPU
coretemp1 at cpu1: thermal sensor, 1 C resolution, Tjmax=105
acpicpu2 at cpu2: ACPI CPU
acpicpu3 at cpu3: ACPI CPU
```

The next lines which should be printed, but aren't, are:
```
timecounter: Timecounter "clockinterrupt" frequency 100 Hz quality 0
timecounter: Timecounter "TSC" frequency 1795921000 Hz quality 3000
uhub0 at usb0: NetBSD (0x0000) xHCI root hub (0x0000), class 9/0, rev 3.00/1.00, addr 0
uhub0: 4 ports with 4 removable, self powered
uhub1 at usb1: NetBSD (0x0000) xHCI root hub (0x0000), class 9/0, rev 2.00/1.00, addr 0
uhub1: 4 ports with 4 removable, self powered
```

Once I got this message when shutting down:
```
unmounted procfs on /proc type procfs
unmounted ptyfs on /dev/pts type ptyfs
unmounted kernfs on /kern type kernfs
ACPI Error: Mutex [ACPI_MTX_Namespace] (0x1) is not acquired, cannot release (20211217/utmutex-367)
uhub5: detached
uhub2: detached
uhub0: detached
```

Not sure if it's related.

-RVP