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

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Date: Mon, 29 Jan 2024 16:01:25 -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 14:49, Steven Rostedt <rostedt@...dmis.org> wrote:
>
> Now I didn't change this last d_instantiate, because this is not called
> through the lookup code. This is the root events directory and acts more
> like debugfs. It's not "dynamically" added.

Ahh, yes, I see, the dentry was created (as a negative one) with
tracefs_start_creating() -> lookup_one_len().

So  yes, there d_instantiate() is correct, as it's exactly that "turn
negative dentry into a positive one" case.

I'll go see what's up with the "create it again" case - I don't
immediately see what's wrong.

              Linus