Re: [for-next-3.11][PATCH 0/8] ftrace/tracing: Event file fixes and ftrace function hash fixes

Oleg Nesterov
2013-07-31T11:52:47Z

On 07/30, Steven Rostedt wrote:
>
> Using the i_private and event_mutex
> to verify that the event still exists to solve the race.

To remind, we also need the "debugfs: debugfs_remove_recursive() must
not rely on list_empty(d_subdirs)" patch, otherwise we still have the
problems with the opened files.

Just in case, we need this fix even if .open() does trace_array_get()
or tracing_open_generic_file() (removed by recent changes), rmdir can
be called before we increment the counter and the deleted dentry breaks
debugfs_remove_recursive().

But after the recent changes this fix becomes more important. An opened
file confuses debugfs_remove_recursive() and after that you can't create
another probe.

Oleg.