linux-kernel - Re: [linus:master] [eventfs] 852e46e239: BUG:unable_to_handle_page_fault_for

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Message-ID: <CAHk-=wgOxTeTi02C=kOXsHzuD6XCrV0L1zk1XP9t+a4Wx--xvA@mail.gmail.com>
Date: Mon, 29 Jan 2024 14:42:47 -0800
From: Linus Torvalds <torvalds@...ux-foundation.org>
To: Steven Rostedt <rostedt@...dmis.org>
Cc: kernel test robot <oliver.sang@...el.com>, oe-lkp@...ts.linux.dev, lkp@...el.com, 
	linux-kernel@...r.kernel.org, Masami Hiramatsu <mhiramat@...nel.org>, 
	Mark Rutland <mark.rutland@....com>, Mathieu Desnoyers <mathieu.desnoyers@...icios.com>, 
	Christian Brauner <brauner@...nel.org>, Al Viro <viro@...iv.linux.org.uk>, 
	Ajay Kaher <ajay.kaher@...adcom.com>, linux-trace-kernel@...r.kernel.org
Subject: Re: [linus:master] [eventfs] 852e46e239: BUG:unable_to_handle_page_fault_for_address

On Mon, 29 Jan 2024 at 14:35, Linus Torvalds
<torvalds@...ux-foundation.org> wrote:
>
> So just replace all the d_instantiate() calls there with "d_add()"
> instead. I think that will fix it.

I can confirm that with the mutex deadlock removed and the d_add()
fix, at least things *look* superficially ok.

I didn't actually do anything with it. So it might be leaking dentry
refs like mad or something like that, but at least the obvious cases
look fine.

just for completeness, here's the fixup diff I used.

                  Linus

View attachment "fixup.diff" of type "text/x-patch" (1795 bytes)