Ubuntu
linux package

  1. Bug #1861359
  2. Comment #42

Comment 42 for bug 1861359

Revision history for this message
Seth Arnold (seth-arnold) wrote :

$ uname -a
Linux millbarge 5.4.0-12-generic #15-Ubuntu SMP Tue Jan 21 15:12:29 UTC 2020 x86_64 x86_64 x86_64 GNU/Linux
$ cat /proc/sys/kernel/ftrace_enabled
1
$ sudo kprobe-perf -s 'p:shrink_node'
[sudo] password for sarnold:
ERROR: func shrink_node not in /sys/kernel/debug/tracing/available_filter_functions.
Either it doesn't exist, or, it might be unsafe to kprobe. Exiting. Use -F to override.
$ sudo kprobe-perf -F -s 'p:shrink_node'
Tracing kprobe shrink_node. Ctrl-C to end.
/usr/sbin/kprobe-perf: line 227: current_tracer: Permission denied
/usr/sbin/kprobe-perf: line 228: kprobe_events: Permission denied
ERROR: adding kprobe "p:shrink_node shrink_node".
Last 2 dmesg entries (might contain reason):
    [1039094.850875] usb 1-4.4.1.3: Manufacturer: u-blox AG - www.u-blox.com
    [1039094.860068] cdc_acm 1-4.4.1.3:1.0: ttyACM1: USB ACM device
Exiting.

Does the /proc/sys/kernel/ftrace_enabled output need a new bug report?

Thanks