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

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Message-ID: <20240129181528.2aa5e39f@gandalf.local.home>
Date: Mon, 29 Jan 2024 18:15:28 -0500
From: Steven Rostedt <rostedt@...dmis.org>
To: Linus Torvalds <torvalds@...ux-foundation.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 17:47:32 -0500
Steven Rostedt <rostedt@...dmis.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