Kernel 4.1 separated the tracing system from the debugfs, actual documentation already points to a different path that needs this new mount to exist.
the old sysfs path will still be an automount in the debugfs, created by the kernel (for now).
aaaf42cb44 units: add mount for tracefs
units/meson.build | 2 ++
units/sys-kernel-tracing.mount | 23 +++++++++++++++++++++++
2 files changed, 25 insertions(+)