/sys/kernel/debug/tracing mountpoint has been deprecated since 6.17

[charleschetty]

Since Linux 6.17 the /sys/kernel/debug/tracing mountpoint has been deprecated and is only accessible if CONFIG_TRACEFS_AUTOMOUNT_DEPRECATED=y is set.

As a result, on some distributions (for example, Arch Linux link ) the usual way of reading trace_pipe may fail:

sudo cat /sys/kernel/debug/tracing/trace_pipe | grep *****

If someone meet the same issue , simply change the path as /sys/kernel/tracing/trace_pipe or just use bpftool prog tracelog can work.

Also, some libraries (for example, bcc) also break due to the deprecated mountpoint, from now the issue haven't been fixed (iovisor/bcc#5423). Switching from the 6.18 kernel to the LTS kernel is a simple workaround that resolves the problem.