On Thu, Sep 11, 2025 at 2:03 PM Quentin Monnet <qmo@xxxxxxxxxx> wrote:
>
> 2025-09-11 10:27 UTC-0700 ~ Alexei Starovoitov
> <alexei.starovoitov@xxxxxxxxx>
> > Hi Quentin,
> >
> > since last merge window bpftool triggers a warn:
> > $ bpftool prog tracelog
> > [ 72.942082] NOTICE: Automounting of tracing to debugfs is
> > deprecated and will be removed in 2030
> >
> >
> > I suspect it happens because get_tracefs_pipe()
> > accesses debug/tracing first which causes automnount
> > and triggers this warning.
> >
> > Pls take a look.
>
>
> Hi Alexei, sure, I'll look into it.
>
> I haven't tested yet, but the check on /sys/kernel/debug/tracing is
> likely to be the cause indeed. If that's the case, would that be OK to
> move it to the end of the "known_mnts" list in the function? Or do you
> prefer to avoid the warning completely, even at the cost of missing the
> tracefs on older systems?
Older kernels won't have this warn.
Also I don't know what these are:
"/tracing",
"/trace",
I think the fix would be to do:
"/sys/kernel/tracing",
"/sys/kernel/debug/tracing",
