Re: [REGRESSION] Power9 pseries boot hang in v7.2-rc6, narrowed to PowerPC GENERIC_ENTRY conversion window

[Mukesh Kumar Chaurasiya]

On Thu, Sep 03, 2026 at 01:22:35PM +0200, Thorsten Leemhuis wrote:
> On 8/12/26 07:16, Venkat Rao Bagalkote wrote:
> > On 11/08/26 6:16 pm, Mukesh Kumar Chaurasiya wrote:
> >> On Tue, Aug 11, 2026 at 11:37:45AM +0530, Mukesh Kumar Chaurasiya wrote:
> >>> On Mon, Aug 10, 2026 at 05:19:27PM +0530, Venkat Rao Bagalkote wrote:
> >>>> On 04/08/26 8:23 pm, Shrikanth Hegde wrote:
> >>>>> On 8/4/26 2:04 PM, Venkat Rao Bagalkote wrote:
> >>>>>>
> >>>>>> I'm seeing a boot regression on a Power9 pseries LPAR. The system
> >>>>>> hangs very early during boot after:
> >>>>>>
> >>>>>> Quiescing Open Firmware ...
> >>>>>> Booting Linux via __start() ...
> >>>>>>
> >>>>> That is strange. not sure where to look at without any logs.
> >>>>> Is it a specific config that fails or this specific LPAR that fails?
> >>>>>
> >>> Is this a specific lpar or all power9 pseries are exhibiting same
> >>> behaviour?
> > Its specific to a lpar.
> >>
> >> Can you try the below fix?
> > [...]
> >
> > I tired this fix, but issue still persists.
> This regression made it to my list of tracked regression -- and it looks
> like this stalled. Is that the case? Or was this resolved meanwhile?
> 
> Ciao, Thorsten

Hey Thorsten,
I am working on this, as of now I have a theory that the RMA size
boundry is being crossed by something and causing this thing.

For now the workaround is disabling KASAN. Can you also confirm the
same.
Can I also know the compiler version you are using?

Regards,
Mukesh