Re: [linus:master] [eventfs] 852e46e239: BUG:unable_to_handle_page_fault_for_address

[Steven Rostedt]

On Mon, 29 Jan 2024 17:47:32 -0500
Steven Rostedt <rostedt@xxxxxxxxxxx> 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