Received-SPF: pass (google.com: domain of linux-kernel+bounces-43611-linux.lists.archive=gmail.com@vger.kernel.org designates 147.75.199.223 as permitted sender) client-ip=147.75.199.223;
Date: Mon, 29 Jan 2024 18:15:28 -0500
From: Steven Rostedt <rostedt@goodmis.org>
To: Linus Torvalds <torvalds@linux-foundation.org>
Cc: kernel test robot <oliver.sang@intel.com>, oe-lkp@lists.linux.dev,
 lkp@intel.com, linux-kernel@vger.kernel.org, Masami Hiramatsu
 <mhiramat@kernel.org>, Mark Rutland <mark.rutland@arm.com>, Mathieu
 Desnoyers <mathieu.desnoyers@efficios.com>, Christian Brauner
 <brauner@kernel.org>, Al Viro <viro@zeniv.linux.org.uk>, Ajay Kaher
 <ajay.kaher@broadcom.com>, linux-trace-kernel@vger.kernel.org
Subject: Re: [linus:master] [eventfs] 852e46e239:
 BUG:unable_to_handle_page_fault_for_address
Message-ID: <20240129181528.2aa5e39f@gandalf.local.home>
In-Reply-To: <20240129174732.1cea0d69@gandalf.local.home>
References: <202401291043.e62e89dc-oliver.sang@intel.com>
	<CAHk-=wh0M=e8R=ZXxa4vesLTtvGmYWJ-w1VmXxW5Mva=Nimk4Q@mail.gmail.com>
	<20240129120125.605e97af@gandalf.local.home>
	<CAHk-=wghx8Abyx_jcSrCDuNj96SuWS0NvNMhfU8VjFGg9bgm_g@mail.gmail.com>
	<CAHk-=whb91PWEaEJpRGsuWaQpYZGj98ji8HC2vvHD4xb_TqhJw@mail.gmail.com>
	<CAHk-=wgp7UkG31=cCcbSdhMv6-vBJ=orktUOUdiLzw4tQ4gDLg@mail.gmail.com>
	<20240129152600.7587d1aa@gandalf.local.home>
	<CAHk-=wghobf5qCqNUsafkQzNAZBJiS0=7CRjNXNChpoAvTbvUw@mail.gmail.com>
	<20240129172200.1725f01b@gandalf.local.home>
	<CAHk-=wjV6+U1FQ8wzQ5ASmqGgby+GZ6wpdh0NrJgA43mc+TEwA@mail.gmail.com>
	<20240129174732.1cea0d69@gandalf.local.home>
Precedence: bulk
MIME-Version: 1.0
Content-Type: text/plain; charset=US-ASCII
Content-Transfer-Encoding: 7bit

On Mon, 29 Jan 2024 17:47:32 -0500
Steven Rostedt <rostedt@goodmis.org> wrote:

> > And I hope there aren't any other stupid things I missed like that.  
> 
> Well the preliminary tests pass with this added to your patch:

Spoke too soon. The later tests started failing.

It fails on creating a kprobe, deleting it, and then recreating it. Even
though the directory is there, it can't be accessed.

 # cd /sys/kernel/tracing

// Create a kprobe

 # echo 'p:sched schedule' >> kprobe_events 
 # ls events/kprobes/
enable  filter  sched

// Now delete the kprobe

 # echo '-:sched schedule' >> kprobe_events

// Make sure it's gone

 # ls events/kprobes/
ls: cannot access 'events/kprobes/': No such file or directory

// Recreate it

 # echo 'p:sched schedule' >> kprobe_events 
 # ls events/kprobes/
ls: cannot access 'events/kprobes/': No such file or directory
 # ls events | grep kprobes
kprobes

No longer able to access it.

 # ls -l events | grep kprobes
ls: cannot access 'events/kprobes': No such file or directory
d????????? ? ?    ?    ?            ? kprobes


-- Steve