linux-kernel - Re: [External] [PATCH 0/2] bpf, x86/unwind/orc: Support reliable unwinding through BPF stack frames

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Message-ID: <fe0e9330-8ad7-4835-9ba9-adbcbe40e6a3@crowdstrike.com>
Date: Tue, 2 Dec 2025 15:56:26 -0500
From: Andrey Grodzovsky <andrey.grodzovsky@...wdstrike.com>
To: Josh Poimboeuf <jpoimboe@...nel.org>, <x86@...nel.org>
CC: <linux-kernel@...r.kernel.org>, <live-patching@...r.kernel.org>,
        <bpf@...r.kernel.org>, Petr Mladek <pmladek@...e.com>,
        Song Liu
	<song@...nel.org>, Raja Khan <raja.khan@...wdstrike.com>,
        Miroslav Benes
	<mbenes@...e.cz>, Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann
	<daniel@...earbox.net>,
        Andrii Nakryiko <andrii@...nel.org>,
        Peter Zijlstra
	<peterz@...radead.org>,
        DL Linux Open Source Team
	<linux-open-source@...wdstrike.com>
Subject: Re: [External] [PATCH 0/2] bpf, x86/unwind/orc: Support reliable
 unwinding through BPF stack frames

On 12/2/25 13:19, Josh Poimboeuf wrote:
> Fix livepatch stalls which may be seen when a task is blocked with BPF
> JIT on its kernel stack.
> 
> Josh Poimboeuf (2):
>    bpf: Add bpf_has_frame_pointer()
>    x86/unwind/orc: Support reliable unwinding through BPF stack frames
> 
>   arch/x86/kernel/unwind_orc.c | 39 +++++++++++++++++++++++++-----------
>   arch/x86/net/bpf_jit_comp.c  | 10 +++++++++
>   include/linux/bpf.h          |  3 +++
>   kernel/bpf/core.c            | 16 +++++++++++++++
>   4 files changed, 56 insertions(+), 12 deletions(-)
> 


Acked-and-tested-by: Andrey Grodzovsky<andrey.grodzovsky@...wdstrike.com>

Question - This looks to be x86 specific issue since ORC unwinding is 
x86 specific and as such this has no impact on ARM, correct ?

Andrey