Where is the correct place to report this bug? (perf_event_paranoid error message out of date)

[willhansen]

The default value for perf_event_paranoid seems to be 4.

Command: perf stat ls

Result:

Error:
Access to performance monitoring and observability operations is limited.
Consider adjusting /proc/sys/kernel/perf_event_paranoid setting to open
access to performance monitoring and observability operations for processes
without CAP_PERFMON, CAP_SYS_PTRACE or CAP_SYS_ADMIN Linux capability.
More information can be found at 'Perf events and tool security' document:
https://www.kernel.org/doc/html/latest/admin-guide/perf-security.html
perf_event_paranoid setting is 4:
  -1: Allow use of (almost) all events by all users
      Ignore mlock limit after perf_event_mlock_kb without CAP_IPC_LOCK
>= 0: Disallow raw and ftrace function tracepoint access
>= 1: Disallow CPU event access
>= 2: Disallow kernel profiling
To make the adjusted perf_event_paranoid setting permanent preserve it
in /etc/sysctl.conf (e.g. kernel.perf_event_paranoid = <setting>)

OS:

• Linux Mint 21.3
• kernel: 5.15.0-113-generic

Even after giving /usr/bin/perf all of CAP_PERFMON, CAP_SYS_PTRACE, and CAP_SYS_ADMIN with sudo setcap "cap_perfmon,cap_sys_ptrace,cap_ipc_lock,cap_syslog,cap_sys_admin=ep" /usr/bin/perf for a group the current non-root user is in (in my case, I made a perf_users one as suggested by the linux kernel docs) the same error message appears.

It turns out that the problem was the default version of perf_event_paranoid of 4 prevents all non-root users from doing profiling. Setting it to 3 fixes the problem. I think the behavior was originally introduced in debian, but specifically in Ubuntu with value 4 in this commit

The bug I'm trying to report is that the listed values for perf_event_paranoid in that one error message only go up to two. Having the effect of it being 4 listed would have saved me quite a bit of time.

Am I supposed to file this in the ubuntu bug tracker (that needs an Ubuntu One account)? Am I supposed to file it in the OS that I'm using (Linux Mint), and then a dev sends it upstream? Where in the Linux Mint project would I put this bug report?