Re: [PATCH v2 0/6] unwind, arm64: add sframe unwinder for kernel

Dylan Hatch <[email protected]> Fri, 14 Nov 2025 22:50:16 -0800

Newsgroups	org.kernel.vger.linux-toolchains,org.kernel.vger.linux-kernel,org.kernel.vger.live-patching
Message-ID	<CADBMgpwZ32+shSa0SwO8y4G-Zw14ae-FcoWreA_ptMf08Mu9dA@mail.gmail.com>

On Mon, Sep 29, 2025 at 12:55 PM Puranjay Mohan <[email protected]> wrote:
>
> I will try to debug this more but am just curious about BPF's
> interactions with sframe.
> The sframe data for bpf programs doesn't exist, so we would need to
> add that support
> and that wouldn't be trivial, given the BPF programs are JITed.
>
> Thanks,
> Puranjay

From what I can tell, the ORC unwinder in x86 falls back to using
frame pointers in cases of generated code, like BPF. Would matching
this behavior in the sframe unwinder be a reasonable approach, at
least for the purposes of enabling reliable unwind for livepatch?

Thanks,
Dylan