Software: nginx/1.23.4. PHP/5.6.40-65+ubuntu20.04.1+deb.sury.org+1 

uname -a: Linux foro-restaurado-2 5.15.0-1040-oracle #46-Ubuntu SMP Fri Jul 14 21:47:21 UTC 2023
aarch64 

uid=33(www-data) gid=33(www-data) groups=33(www-data) 

Safe-mode: OFF (not secure)

/usr/src/linux-oracle-5.13-headers-5.13.0-1018/tools/testing/selftests/bpf/   drwxr-xr-x
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Viewing file:     test_ftrace.sh (701 B)      -rwxr-xr-x

#!/bin/bash

TR=/sys/kernel/debug/tracing/
clear_trace() { # reset trace output
    echo > $TR/trace
}

disable_tracing() { # stop trace recording
    echo 0 > $TR/tracing_on
}

enable_tracing() { # start trace recording
    echo 1 > $TR/tracing_on
}

reset_tracer() { # reset the current tracer
    echo nop > $TR/current_tracer
}

disable_tracing
clear_trace

echo "" > $TR/set_ftrace_filter
echo '*printk* *console* *wake* *serial* *lock*' > $TR/set_ftrace_notrace

echo "bpf_prog_test*" > $TR/set_graph_function
echo "" > $TR/set_graph_notrace

echo function_graph > $TR/current_tracer

enable_tracing
./test_progs -t fentry
./test_progs -t fexit
disable_tracing
clear_trace

reset_tracer

exit 0