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Date: Mon, 20 Jul 2026 10:19:27 +0100
From: Simon Horman <horms@kernel.org>
To: Mike Rapoport <rppt@kernel.org>
Cc: Pnina Feder <pnina.feder@mobileye.com>,
	Andrew Morton <akpm@linux-foundation.org>,
	Baoquan He <baoquan.he@linux.dev>,
	Pasha Tatashin <pasha.tatashin@soleen.com>,
	Pratyush Yadav <pratyush@kernel.org>,
	Thomas Bogendoerfer <tsbogend@alpha.franken.de>,
	Paul Walmsley <pjw@kernel.org>, Palmer Dabbelt <palmer@dabbelt.com>,
	Albert Ou <aou@eecs.berkeley.edu>,
	Dave Young <ruirui.yang@linux.dev>,
	Jonathan Corbet <corbet@lwn.net>, Alexandre Ghiti <alex@ghiti.fr>,
	kexec@lists.infradead.org, linux-kernel@vger.kernel.org,
	linux-mips@vger.kernel.org, linux-riscv@lists.infradead.org,
	linux-doc@vger.kernel.org
Subject: Re: [PATCH 0/4] vmcore-tasks: export per-task metadata to vmcoreinfo
Message-ID: <20260720091927.GA1736709@horms.kernel.org>
References: <20260622211430.4008899-1-pnina.feder@mobileye.com>
 <akybBoCAm-kJbfHL@kernel.org>
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In-Reply-To: <akybBoCAm-kJbfHL@kernel.org>

On Tue, Jul 07, 2026 at 09:21:58AM +0300, Mike Rapoport wrote:
> (adding new Baoquan's email)
> 
> Hi Pnina,
> On Tue, Jun 23, 2026 at 12:14:26AM +0300, Pnina Feder wrote:
> > This series extends vmcoreinfo with struct offsets and sizes needed by
> > the vmcore-tasks userspace tool to extract per-task state from a vmcore
> > dump without requiring kernel debug symbols (DWARF/BTF).
> > 
> > The vmcore-tasks tool reads /proc/vmcore (or a saved vmcore file) and
> > reconstructs, for each task:
> >   - task name, pid, state, flags
> >   - VMA list (start, end, flags, backing file)
> >   - user register state (saved on the kernel stack at kernel entry)
> >   - user-space backtrace with VMA/filename mapping
> >   - kernel dmesg buffer
> > 
> > This provides a lightweight post-mortem crash analysis capability for
> > production environments where full debug info (DWARF/BTF) is not
> > available.
> > 
> > The companion userspace tool is submitted to kexec-tools:
> >   https://lore.kernel.org/all/20260622205550.1087163-1-pnina.feder@mobileye.com/
> 
> Sorry for the delay, this fell between the cracks somehow.
> 
> The kernel side looks fine overall, but to merge it there should be an
> agreement from the userspace side maintainers that vmcore-tasks is
> something they are wishing to accept.

Hi Mike, all,

Sorry for the extended delay.

I will send some minor feedback to the user-space tool patchset
but overall, yes, this is something I would be happy to accept.

I don't want to create a chicken-and-egg type problem here.
But it's probably worth mentioning that usually features
hit the kernel before the corresponding code is accepted
into kexec-tools.

Let me know how you would like to proceed.