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

On Thu, Sep 03, 2026 at 01:22:35PM +0200, Thorsten Leemhuis wrote:

On 8/12/26 07:16, Venkat Rao Bagalkote wrote:

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On 11/08/26 6:16 pm, Mukesh Kumar Chaurasiya wrote:

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On Tue, Aug 11, 2026 at 11:37:45AM +0530, Mukesh Kumar Chaurasiya wrote:

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On Mon, Aug 10, 2026 at 05:19:27PM +0530, Venkat Rao Bagalkote wrote:

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On 04/08/26 8:23 pm, Shrikanth Hegde wrote:

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On 8/4/26 2:04 PM, Venkat Rao Bagalkote wrote:

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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.

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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