tracing doesn't work on focal

Hello, while investigating bug 1861359 I tried to use kprobe-perf to troubleshoot and found that tracing doesn't work on focal:

# kprobe-perf -s 'p:shrink_node'
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.
# ls -l /sys/kernel/debug/tracing/available_filter_functions
ls: cannot access '/sys/kernel/debug/tracing/available_filter_functions': No such file or directory
# find /sys/kernel/debug/tracing
/sys/kernel/debug/tracing
/sys/kernel/debug/tracing/instances
/sys/kernel/debug/tracing/trace_stat
/sys/kernel/debug/tracing/per_cpu
/sys/kernel/debug/tracing/per_cpu/cpu7
/sys/kernel/debug/tracing/per_cpu/cpu6
/sys/kernel/debug/tracing/per_cpu/cpu5
/sys/kernel/debug/tracing/per_cpu/cpu4
/sys/kernel/debug/tracing/per_cpu/cpu3
/sys/kernel/debug/tracing/per_cpu/cpu2
/sys/kernel/debug/tracing/per_cpu/cpu1
/sys/kernel/debug/tracing/per_cpu/cpu0
/sys/kernel/debug/tracing/options

I'm guessing this is due to lockdown:

# dmesg | grep -C2 -i lockdown
[ 0.000000] efi: TPMFinalLog=0x9ff92000 SMBIOS=0x9f05d000 SMBIOS 3.0=0x9f05a000 ACPI=0x9fffe000 ACPI 2.0=0x9fffe014 ESRT=0x9eee7000 MEMATTR=0x99c76018 TPMEventLog=0x931f7018
[ 0.000000] secureboot: Secure boot enabled
[ 0.000000] Kernel is locked down from EFI Secure Boot mode; see man kernel_lockdown.7
[ 0.000000] SMBIOS 3.0.0 present.
[ 0.000000] DMI: LENOVO 20KHCTO1WW/20KHCTO1WW, BIOS N23ET69W (1.44 ) 11/25/2019
--
[ 0.532664] hpet0: 8 comparators, 64-bit 24.000000 MHz counter
[ 0.534731] clocksource: Switched to clocksource tsc-early
[ 0.534737] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.534737] Could not create tracefs 'available_events' entry
[ 0.534741] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.534741] Could not create tracefs 'set_event' entry
[ 0.534742] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.534743] Could not create tracefs 'available_tracers' entry
[ 0.534744] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.534745] Could not create tracefs 'current_tracer' entry
[ 0.534745] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.534746] Could not create tracefs 'tracing_cpumask' entry
[ 0.534747] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.534747] Could not create tracefs 'trace_options' entry
[ 0.534748] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.534748] Could not create tracefs 'trace' entry
[ 0.534749] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.534750] Could not create tracefs 'trace_pipe' entry
[ 0.534750] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.534751] Could not create tracefs 'buffer_size_kb' entry
[ 0.534752] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.534752] Could not create tracefs 'buffer_total_size_kb' entry
[ 0.534753] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.534754] Could not create tracefs 'free_buffer' entry
[ 0.534754] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.534755] Could not create tracefs 'trace_marker' entry
[ 0.534782] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.534783] Could not create tracefs 'trace_marker_raw' entry
[ 0.534783] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.534784] Could not create tracefs 'trace_clock' entry
[ 0.534785] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.534785] Could not create tracefs 'tracing_on' entry
[ 0.534786] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.534786] Could not create tracefs 'timestamp_mode' entry
[ 0.534787] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.534788] Could not create tracefs 'buffer_percent' entry
[ 0.534816] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.534817] Could not create tracefs 'print-parent' entry
[ 0.534817] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.534818] Could not create tracefs 'sym-offset' entry
[ 0.534819] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.534819] Could not create tracefs 'sym-addr' entry
[ 0.534820] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.534820] Could not create tracefs 'verbose' entry
[ 0.534821] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.534822] Could not create tracefs 'raw' entry
[ 0.534822] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.534823] Could not create tracefs 'hex' entry
[ 0.534824] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.534824] Could not create tracefs 'bin' entry
[ 0.534825] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.534825] Could not create tracefs 'block' entry
[ 0.534826] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.534827] Could not create tracefs 'trace_printk' entry
[ 0.534827] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.534828] Could not create tracefs 'annotate' entry
[ 0.534829] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.534829] Could not create tracefs 'userstacktrace' entry
[ 0.534830] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.534830] Could not create tracefs 'sym-userobj' entry
[ 0.534831] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.534832] Could not create tracefs 'printk-msg-only' entry
[ 0.534832] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.534833] Could not create tracefs 'context-info' entry
[ 0.534834] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.534834] Could not create tracefs 'latency-format' entry
[ 0.534835] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.534835] Could not create tracefs 'record-cmd' entry
[ 0.534836] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.534837] Could not create tracefs 'record-tgid' entry
[ 0.534837] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.534838] Could not create tracefs 'overwrite' entry
[ 0.534838] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.534839] Could not create tracefs 'disable_on_free' entry
[ 0.534840] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.534840] Could not create tracefs 'irq-info' entry
[ 0.534841] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.534841] Could not create tracefs 'markers' entry
[ 0.534842] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.534843] Could not create tracefs 'event-fork' entry
[ 0.534843] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.534844] Could not create tracefs 'function-trace' entry
[ 0.534844] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.534845] Could not create tracefs 'function-fork' entry
[ 0.534846] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.534846] Could not create tracefs 'display-graph' entry
[ 0.534847] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.534848] Could not create tracefs 'stacktrace' entry
[ 0.534848] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.534849] Could not create tracefs 'tracing_max_latency' entry
[ 0.534850] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.534850] Could not create tracefs 'snapshot' entry
[ 0.534851] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.534851] Could not create tracefs 'error_log' entry
[ 0.534855] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.534855] Could not create tracefs 'trace_pipe' entry
[ 0.534856] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.534857] Could not create tracefs 'trace' entry
[ 0.534857] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.534858] Could not create tracefs 'trace_pipe_raw' entry
[ 0.534858] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.534859] Could not create tracefs 'stats' entry
[ 0.534860] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.534860] Could not create tracefs 'buffer_size_kb' entry
[ 0.534861] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.534862] Could not create tracefs 'snapshot' entry
[ 0.534862] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.534863] Could not create tracefs 'snapshot_raw' entry
[ 0.534864] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.534865] Could not create tracefs 'trace_pipe' entry
[ 0.534866] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.534866] Could not create tracefs 'trace' entry
[ 0.534867] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.534867] Could not create tracefs 'trace_pipe_raw' entry
[ 0.534868] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.534869] Could not create tracefs 'stats' entry
[ 0.534869] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.534870] Could not create tracefs 'buffer_size_kb' entry
[ 0.534870] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.534871] Could not create tracefs 'snapshot' entry
[ 0.534872] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.534872] Could not create tracefs 'snapshot_raw' entry
[ 0.534874] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.534874] Could not create tracefs 'trace_pipe' entry
[ 0.534875] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.534875] Could not create tracefs 'trace' entry
[ 0.534876] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.534877] Could not create tracefs 'trace_pipe_raw' entry
[ 0.534877] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.534878] Could not create tracefs 'stats' entry
[ 0.534879] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.534879] Could not create tracefs 'buffer_size_kb' entry
[ 0.534880] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.534880] Could not create tracefs 'snapshot' entry
[ 0.534881] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.534881] Could not create tracefs 'snapshot_raw' entry
[ 0.534885] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.534885] Could not create tracefs 'trace_pipe' entry
[ 0.534886] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.534887] Could not create tracefs 'trace' entry
[ 0.534887] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.534888] Could not create tracefs 'trace_pipe_raw' entry
[ 0.534888] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.534889] Could not create tracefs 'stats' entry
[ 0.534890] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.534890] Could not create tracefs 'buffer_size_kb' entry
[ 0.534891] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.534891] Could not create tracefs 'snapshot' entry
[ 0.534892] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.534893] Could not create tracefs 'snapshot_raw' entry
[ 0.534894] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.534895] Could not create tracefs 'trace_pipe' entry
[ 0.534895] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.534896] Could not create tracefs 'trace' entry
[ 0.534897] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.534897] Could not create tracefs 'trace_pipe_raw' entry
[ 0.534898] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.534898] Could not create tracefs 'stats' entry
[ 0.534899] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.534900] Could not create tracefs 'buffer_size_kb' entry
[ 0.534900] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.534901] Could not create tracefs 'snapshot' entry
[ 0.534901] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.534902] Could not create tracefs 'snapshot_raw' entry
[ 0.534904] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.534904] Could not create tracefs 'trace_pipe' entry
[ 0.534905] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.534905] Could not create tracefs 'trace' entry
[ 0.534906] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.534907] Could not create tracefs 'trace_pipe_raw' entry
[ 0.534907] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.534908] Could not create tracefs 'stats' entry
[ 0.534908] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.534909] Could not create tracefs 'buffer_size_kb' entry
[ 0.534910] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.534910] Could not create tracefs 'snapshot' entry
[ 0.534911] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.534911] Could not create tracefs 'snapshot_raw' entry
[ 0.534913] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.534914] Could not create tracefs 'trace_pipe' entry
[ 0.534914] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.534915] Could not create tracefs 'trace' entry
[ 0.534915] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.534916] Could not create tracefs 'trace_pipe_raw' entry
[ 0.534917] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.534917] Could not create tracefs 'stats' entry
[ 0.534918] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.534918] Could not create tracefs 'buffer_size_kb' entry
[ 0.534919] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.534920] Could not create tracefs 'snapshot' entry
[ 0.534920] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.534921] Could not create tracefs 'snapshot_raw' entry
[ 0.534922] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.534923] Could not create tracefs 'trace_pipe' entry
[ 0.534924] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.534924] Could not create tracefs 'trace' entry
[ 0.534925] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.534925] Could not create tracefs 'trace_pipe_raw' entry
[ 0.534926] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.534927] Could not create tracefs 'stats' entry
[ 0.534927] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.534928] Could not create tracefs 'buffer_size_kb' entry
[ 0.534928] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.534929] Could not create tracefs 'snapshot' entry
[ 0.534930] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.534930] Could not create tracefs 'snapshot_raw' entry
[ 0.534931] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.534931] Could not create tracefs 'set_ftrace_pid' entry
[ 0.534932] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.534933] Could not create tracefs 'available_filter_functions' entry
[ 0.534934] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.534934] Could not create tracefs 'enabled_functions' entry
[ 0.534935] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.534936] Could not create tracefs 'set_ftrace_filter' entry
[ 0.534936] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.534937] Could not create tracefs 'set_ftrace_notrace' entry
[ 0.534937] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.534938] Could not create tracefs 'set_graph_function' entry
[ 0.534939] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.534939] Could not create tracefs 'set_graph_notrace' entry
[ 0.534942] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.534943] ------------[ cut here ]------------
[ 0.534944] Could not register function stat for cpu 0
--
[ 0.535004] ret_from_fork+0x35/0x40
[ 0.535008] ---[ end trace a9f51a1c2b8afb59 ]---
[ 0.535008] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.535008] Could not create tracefs 'tracing_thresh' entry
[ 0.535008] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.535008] Could not create tracefs 'README' entry
[ 0.535008] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.535008] Could not create tracefs 'saved_cmdlines' entry
[ 0.535008] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.535008] Could not create tracefs 'saved_cmdlines_size' entry
[ 0.535008] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.535008] Could not create tracefs 'saved_tgids' entry
[ 0.536594] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.536594] Could not create tracefs 'dyn_ftrace_total_info' entry
[ 0.536594] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.536594] Could not create tracefs 'funcgraph-overrun' entry
[ 0.536594] ------------[ cut here ]------------
--
[ 0.536594] ret_from_fork+0x35/0x40
[ 0.536594] ---[ end trace a9f51a1c2b8afb5a ]---
[ 0.536594] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.536594] Could not create tracefs 'funcgraph-cpu' entry
[ 0.536594] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.536594] Could not create tracefs 'funcgraph-overhead' entry
[ 0.536594] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.536594] Could not create tracefs 'funcgraph-proc' entry
[ 0.536594] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.536594] Could not create tracefs 'funcgraph-duration' entry
[ 0.536594] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.536594] Could not create tracefs 'funcgraph-abstime' entry
[ 0.536594] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.536594] Could not create tracefs 'funcgraph-irqs' entry
[ 0.536594] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.536594] Could not create tracefs 'funcgraph-tail' entry
[ 0.536594] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.536594] Could not create tracefs 'sleep-time' entry
[ 0.536594] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.536594] Could not create tracefs 'graph-time' entry
[ 0.536594] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.536594] Could not create tracefs 'func_stack_trace' entry
[ 0.536594] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.536594] Could not create tracefs 'test_nop_accept' entry
[ 0.536594] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.536594] Could not create tracefs 'test_nop_refuse' entry
[ 0.536594] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.536594] Could not create tracefs 'printk_formats' entry
[ 0.536594] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.536594] Could not create tracefs 'max_graph_depth' entry
[ 0.536594] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.536594] Could not create tracefs 'synthetic_events' entry
[ 0.536594] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.536594] trace_kprobe: Could not create tracefs 'kprobe_events' entry
[ 0.536594] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.536594] trace_kprobe: Could not create tracefs 'kprobe_profile' entry
[ 0.536594] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.536594] Could not create tracefs 'dynamic_events' entry
[ 0.536594] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.536594] Could not create tracefs 'uprobe_events' entry
[ 0.536594] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.536594] Could not create tracefs 'uprobe_profile' entry
[ 0.536594] *** VALIDATE bpf ***
--
[ 0.820588] caller snb_uncore_imc_init_box+0x6c/0xb0 mapping multiple BARs
[ 0.820865] check: Scanning for low memory corruption every 60 seconds
[ 0.823207] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.823208] Could not create tracefs 'stack_max_size' entry
[ 0.823209] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.823209] Could not create tracefs 'stack_trace' entry
[ 0.823210] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.823211] Could not create tracefs 'stack_trace_filter' entry
[ 0.823217] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.823218] Could not create tracefs 'blk_classic' entry
[ 0.823218] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.823219] Could not create tracefs 'blk_cgroup' entry
[ 0.823220] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.823220] Could not create tracefs 'blk_cgname' entry
[ 0.823436] Initialise system trusted keyrings
--
[ 0.952067] sched_clock: Marking stable (951207778, 849693)->(1034265626, -82208155)
[ 0.952144] registered taskstats version 1
[ 0.952149] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.952154] Loading compiled-in X.509 certificates
[ 0.953366] Loaded X.509 cert 'Build time autogenerated kernel key: b859a3f0d1fb97c048eb1e12333684e1db3073ca'
--
[ 1.001913] tty ttyS1: hash matches
[ 1.002134] rtc_cmos 00:04: setting system clock to 2020-02-06T20:44:21 UTC (1581021861)
[ 1.002371] Lockdown: swapper/0: hibernation is restricted; see man kernel_lockdown.7
[ 1.003280] Freeing unused decrypted memory: 2040K
[ 1.003638] Freeing unused kernel image memory: 2680K
--
[ 71.456989] systemd[1]: Detected architecture x86-64.
[ 71.473620] systemd[1]: Set hostname to <millbarge>.
[ 71.475128] Lockdown: systemd: /dev/mem,kmem,port is restricted; see man kernel_lockdown.7
[ 71.583229] systemd[1]: /lib/systemd/system/dbus.socket:5: ListenStream= references a path below legacy directory /var/run/, updating /var/run/dbus/system_bus_socket → /run/dbus/system_bus_socket; please update the unit file accordingly.
[ 71.592395] systemd[1]: /lib/systemd/system/virtlogd.socket:6: ListenStream= references a path below legacy directory /var/run/, updating /var/run/libvirt/virtlogd-sock → /run/libvirt/virtlogd-sock; please update the unit file accordingly.
--
[ 72.994080] audit: type=1400 audit(1581021933.486:11): apparmor="STATUS" operation="profile_load" profile="unconfined" name="/usr/sbin/tcpdump" pid=2420 comm="apparmor_parser"
[ 73.080322] Adding 2097148k swap on /dev/zd0. Priority:-2 extents:1 across:2097148k SSDscFS
[ 73.791076] Lockdown: rasdaemon: use of tracefs is restricted; see man kernel_lockdown.7
[ 73.791078] Could not create tracefs 'set_event' entry
[ 73.793322] Lockdown: rasdaemon: use of tracefs is restricted; see man kernel_lockdown.7
[ 73.793324] Could not create tracefs 'set_event' entry
[ 73.812049] Lockdown: rasdaemon: use of tracefs is restricted; see man kernel_lockdown.7
[ 73.812050] Could not create tracefs 'set_event' entry
[ 73.887930] Bluetooth: hci0: Waiting for firmware download to complete
--
[ 73.900884] Bluetooth: hci0: Found Intel DDC parameters: intel/ibt-12-16.ddc
[ 73.903619] Bluetooth: hci0: Applying Intel DDC parameters completed
[ 74.166659] Lockdown: Xorg: raw io port access is restricted; see man kernel_lockdown.7
[ 75.423231] bridge: filtering via arp/ip/ip6tables is no longer available by default. Update your scripts to load br_netfilter if you need this.
[ 75.424155] virbr0: port 1(virbr0-nic) entered blocking state
--
[ 75.878990] virbr0: port 1(virbr0-nic) entered listening state
[ 75.932525] virbr0: port 1(virbr0-nic) entered disabled state
[ 76.013277] Lockdown: systemd-logind: hibernation is restricted; see man kernel_lockdown.7
[ 76.015903] Lockdown: systemd-logind: hibernation is restricted; see man kernel_lockdown.7
[ 76.016454] Lockdown: systemd-logind: hibernation is restricted; see man kernel_lockdown.7
[ 77.672659] drm: not enough stolen space for compressed buffer (need 36864000 more bytes), disabling. Hint: you may be able to increase stolen memory size in the BIOS to avoid this.
[ 78.458791] e1000e: enp0s31f6 NIC Link is Up 1000 Mbps Full Duplex, Flow Control: None
#

Thanks

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: perf-tools-unstable 1.0.1~20200130+git49b8cdf-1ubuntu1
ProcVersionSignature: Ubuntu 5.4.0-12.15-generic 5.4.8
Uname: Linux 5.4.0-12-generic x86_64
NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair
ApportVersion: 2.20.11-0ubuntu16
Architecture: amd64
Date: Tue Feb 11 00:57:36 2020
Dependencies:

PackageArchitecture: all
ProcEnviron:
 TERM=rxvt-unicode-256color
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: perf-tools-unstable
UpgradeStatus: Upgraded to focal on 2020-01-24 (17 days ago)
---
ProblemType: Bug
AlsaVersion: Advanced Linux Sound Architecture Driver Version k5.4.0-12-generic.
ApportVersion: 2.20.11-0ubuntu16
Architecture: amd64
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC1: sarnold 4492 F.... pulseaudio
 /dev/snd/controlC0: sarnold 4492 F.... pulseaudio
Card0.Amixer.info:
 Card hw:0 'PCH'/'HDA Intel PCH at 0x2fe1028000 irq 146'
   Mixer name : 'Realtek ALC285'
   Components : 'HDA:10ec0285,17aa225c,00100002 HDA:8086280b,80860101,00100000'
   Controls : 53
   Simple ctrls : 15
Card1.Amixer.info:
 Card hw:1 'Audio'/'Generic ThinkPad Dock USB Audio at usb-0000:00:14.0-4.2.4, high speed'
   Mixer name : 'USB Mixer'
   Components : 'USB17ef:306f'
   Controls : 9
   Simple ctrls : 4
Dependencies:

DistroRelease: Ubuntu 20.04
HibernationDevice: RESUME=none
IwConfig: Error: [Errno 2] No such file or directory: 'iwconfig': 'iwconfig'
MachineType: LENOVO 20KHCTO1WW
NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair
Package: perf-tools-unstable 1.0.1~20200130+git49b8cdf-1ubuntu1
PackageArchitecture: all
ProcEnviron:
 TERM=rxvt-unicode-256color
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
 SHELL=/bin/bash
ProcFB: 0 i915drmfb
ProcKernelCmdLine: BOOT_IMAGE=/BOOT/ubuntu@/vmlinuz-5.4.0-12-generic root=ZFS=rpool/ROOT/ubuntu ro root=ZFS=rpool/ROOT/ubuntu quiet splash acpi_osi=! "acpi_osi=Windows 2015" cgroup_disable=memory vt.handoff=1
ProcVersionSignature: Ubuntu 5.4.0-12.15-generic 5.4.8
RelatedPackageVersions:
 linux-restricted-modules-5.4.0-12-generic N/A
 linux-backports-modules-5.4.0-12-generic N/A
 linux-firmware 1.186
Tags: focal
Uname: Linux 5.4.0-12-generic x86_64
UpgradeStatus: Upgraded to focal on 2020-01-24 (17 days ago)
UserGroups: adm cdrom libvirt lpadmin plugdev sambashare sbuild sudo
_MarkForUpload: True
dmi.bios.date: 11/25/2019
dmi.bios.vendor: LENOVO
dmi.bios.version: N23ET69W (1.44 )
dmi.board.asset.tag: Not Available
dmi.board.name: 20KHCTO1WW
dmi.board.vendor: LENOVO
dmi.board.version: SDK0J40709 WIN
dmi.chassis.asset.tag: No Asset Information
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: None
dmi.modalias: dmi:bvnLENOVO:bvrN23ET69W(1.44):bd11/25/2019:svnLENOVO:pn20KHCTO1WW:pvrThinkPadX1Carbon6th:rvnLENOVO:rn20KHCTO1WW:rvrSDK0J40709WIN:cvnLENOVO:ct10:cvrNone:
dmi.product.family: ThinkPad X1 Carbon 6th
dmi.product.name: 20KHCTO1WW
dmi.product.sku: LENOVO_MT_20KH_BU_Think_FM_ThinkPad X1 Carbon 6th
dmi.product.version: ThinkPad X1 Carbon 6th
dmi.sys.vendor: LENOVO