Re: assert in qemu under tcg in an smp case

[Daniel Henrique Barboza]

On 6/20/21 8:44 AM, Ivan Warren wrote:
> Hello,
>
> I know this is not a sanctioned or supported case but anyways...
>
> I am getting this situation when ipling/booting AIX (7.2 TL5 SP2) in a virtual 
> SMP environment (8 virtual CPUS) with TCG :
>
> ERROR:../../src/qemu/accel/tcg/tcg-accel-ops-mttcg.c:85:mttcg_cpu_thread_fn: 
> assertion failed: (cpu->halted)
>
> the asset occurs very late during the boot process.
>
> If I comment out the g_assert at or around line 85 of the offender, everything 
> works fine (I haven't tried any tests though)

Can you share the command line you used, host arch, host OS and so on?

> I am having a hard time getting to as how to this occurs (but it's only on AIX 
> - ppc64le linux works fine), but I am suspecting this is related is to how the 
> kernel vary offs and vary on logical processors.
>
> PS : I have searched around - and this seems to be a problem that can be traced 
> from way years back (maybe 3 or 4).

Is this a TCG only problem? I've booted AIX VMs before using KVM. I also
recall that people inside IBM uses the following options to boot AIX
VMs (with KVM):

-machine pseries-2.11,cap-cfpc=workaround,cap-sbbc=workaround,cap-ibs=broken


You might want to make a try with those using TCG, specially the 'pseries-2.11'
version. And no, I don't know whether AIX only boots with this machine version
or if someone managed to boot with that and never attempted a newer machine
again.




Daniel

> --Ivan