Re: [Linux PPC] Disable PREEMPT

On Thu, Sep 10, 2026 at 10:54:07AM +0200, Michal Suchánek wrote:

On Mon, Sep 07, 2026 at 01:32:18PM +0200, Christian Zigotzky wrote:

quoted

On 07 September 2026 at 10:51 am, Michal Suchánek [off-list ref] wrote:

There is the obvious question which I did not notice answered in this
thread: Did you set up sysrq and/or kdump and find out where the kernel
is stuck?

Thanks

Michal

- - -

I think I need kexec for kdump due to the system freezing after activating of KVM HV. Unfortunately kexec doesn’t work on my machines.

Further information: https://github.com/chzigotzky/kernels/releases/tag/Kexec

So there is some bug with kexec initialization on your platform.

Right, you are missing this part:
https://github.com/torvalds/linux/blob/50d05c7c76c96b90462f24debacca971d2e86713/arch/powerpc/kexec/core.c#L205

Maybe it needs to be called from your platform code or something.

Thanks

Michal

Sysrg for dumping stacks to console might still work.

Thanks

Michal