linux-kernel - Re: [PATCH v13] mm: report per-page metadata information

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Message-ID: <66b15addf1a80_c144829473@dwillia2-xfh.jf.intel.com.notmuch>
Date: Mon, 5 Aug 2024 16:06:06 -0700
From: Dan Williams <dan.j.williams@...el.com>
To: Pasha Tatashin <pasha.tatashin@...een.com>, Alison Schofield
	<alison.schofield@...el.com>
CC: Sourav Panda <souravpanda@...gle.com>, <corbet@....net>,
	<gregkh@...uxfoundation.org>, <rafael@...nel.org>,
	<akpm@...ux-foundation.org>, <mike.kravetz@...cle.com>,
	<muchun.song@...ux.dev>, <rppt@...nel.org>, <david@...hat.com>,
	<rdunlap@...radead.org>, <chenlinxuan@...ontech.com>,
	<yang.yang29@....com.cn>, <tomas.mudrunka@...il.com>, <bhelgaas@...gle.com>,
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	<Liam.Howlett@...cle.com>, <surenb@...gle.com>,
	<linux-kernel@...r.kernel.org>, <linux-fsdevel@...r.kernel.org>,
	<linux-doc@...r.kernel.org>, <linux-mm@...ck.org>, <willy@...radead.org>,
	<weixugc@...gle.com>, David Rientjes <rientjes@...gle.com>,
	<nvdimm@...ts.linux.dev>, <linux-cxl@...r.kernel.org>, <yi.zhang@...hat.com>
Subject: Re: [PATCH v13] mm: report per-page metadata information

Pasha Tatashin wrote:
[..]
> Thank you for the heads up. Can you please attach a full config file,
> also was anyone able to reproduce this problem in qemu with emulated
> nvdimm?

Yes, I can reproduce the crash just by trying to reconfigure the mode of
a pmem namespace:

# ndctl create-namespace -m raw -f -e namespace0.0

...where namespace0.0 results from:

    memmap=4G!4G

...passed on the kernel command line.

Kernel config here:

https://gist.github.com/djbw/143705077103d43a735c179395d4f69a