tracefs splats in lockdown=confidentiality mode

[Matthew Garrett]

On Fri, Nov 1, 2019 at 2:08 PM dann frazier <dann.frazier at canonical.com> wrote:

> [    1.763630] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7

This is expected.

> [    2.913934] ------------[ cut here ]------------
> [    2.918435] Could not register function stat for cpu 0
> [    2.923717] WARNING: CPU: 1 PID: 1 at kernel/trace/ftrace.c:987 ftrace_init_tracefs_toplevel+0x168/0x1bc

This is not. I'll look into it.