linux-kernel - Re: [PATCH v2] driver core: Fix userspace expectations of uevent

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Message-ID: <67047c516045d_964fe294b1@dwillia2-xfh.jf.intel.com.notmuch>
Date: Mon, 7 Oct 2024 17:26:57 -0700
From: Dan Williams <dan.j.williams@...el.com>
To: Dan Williams <dan.j.williams@...el.com>, <gregkh@...uxfoundation.org>
CC: <rafael.j.wysocki@...el.com>, <tj@...nel.org>,
	<linux-kernel@...r.kernel.org>, <regressions@...ts.linux.dev>
Subject: Re: [PATCH v2] driver core: Fix userspace expectations of
 uevent_show() as a probe barrier

Dan Williams wrote:
> Changes since v1 [1]:
> - Move the new "locked" infrastructure to private header files to make
>   it clear it is not approved for general usage (Greg)

Greg, per the 0day report and further testing I am missing something
subtle in using kernfs open files to pin device objects. So hold off on
this for now until I can get that root caused. If someone else can spot
what I missed feel free to chime in, but otherwise I will circle back.

If I don't get back to this before -rc6 I think the theoretical deadlock
that would be re-introduced by a revert of 15fffc6a5624 would be
preferable to this reported regression. I am not aware of any reports of
that deadlock triggering in practice.