Re: [PATCH 0/8] unwind, arm64: add sframe unwinder for kernel

[Weinan Liu]

On Fri, Feb 7, 2025 at 4:16 AM Puranjay Mohan <puranjay@xxxxxxxxxx> wrote:
>
> Yes, I think we should, but others people could add more to this.
> 
> I have been testing this series with Kpatch and created a PR that works
> with this unwinder: https://github.com/dynup/kpatch/pull/1439
> 
> For the modules, I think we need per module sframe tables that are
> initialised when the module is loaded. And the unwinder should use the
> module specific table if the IP is in a module's code.
> 
> Have you already started working on it? if not I would like to help and
> work on that.
> 
> Thanks,
> Puranjay

Thanks for updating the arm64 kpatch PR so quickly.
So we can use kpatch to test this proposal.

I already have a WIP patch to add sframe support to the kernel module.
However, it is not yet working. I had trouble unwinding frames for the 
kernel module using the current algorithm.

Indu has likely identified the issue and will be addressing it from the
toolchain side.

https://sourceware.org/bugzilla/show_bug.cgi?id=32666