Ubuntu22.04（内核5.15.0-56-generic）Ftrace配置后do_sys_open无追踪结果

内核相关配置确认 #

已确认以下Ftrace相关内核配置均已开启：

$ cat /boot/config-5.15.0-56-generic | grep CONFIG_FUNCTION_TRACER
CONFIG_FUNCTION_TRACER=y
$ cat /boot/config-5.15.0-56-generic | grep CONFIG_FUNCTION_GRAPH_TRACER
CONFIG_FUNCTION_GRAPH_TRACER=y
$ cat /boot/config-5.15.0-56-generic | grep CONFIG_STACK_TRACER
CONFIG_STACK_TRACER=y
$ cat /boot/config-5.15.0-56-generic | grep CONFIG_DYNAMIC_FTRACE
CONFIG_DYNAMIC_FTRACE=y

系统内核信息 #

$ uname -a
Linux <redacted> 5.15.0-56-generic #62-Ubuntu SMP Tue Nov 22 19:54:14 UTC 2022 x86_64 x86_64 x86_64 GNU/Linux

已执行的追踪启用操作（root权限） #

$ echo function > /sys/kernel/debug/tracing/current_trace
$ echo do_sys_open > /sys/kernel/debug/tracing/set_ftrace_filter
$ echo 1 > tracing_on

debugfs与tracefs挂载状态 #

$ mount
debugfs on /sys/kernel/debug type debugfs (rw,nosuid,nodev,noexec,relatime)
tracefs on /sys/kernel/tracing type tracefs (rw,nosuid,nodev,noexec,relatime)
tracefs on /sys/kernel/debug/tracing type tracefs (rw,nosuid,nodev,noexec,relatime)

问题现象及更新 #

• 启用追踪后，未在/sys/kernel/debug/tracing/trace或/sys/kernel/debug/tracing/trace_pipe中找到do_sys_open的追踪结果。
• 更新：追踪功能本身正常，已成功捕获do_sys_openat2的追踪日志，但do_sys_open仍无输出。

内容的提问来源于stack exchange，提问作者chandra_cst