[LTP] ftrace: Add common library for C implementation

[linuxtestproject.agent@gmail.com]

Hi Praveen,

On Mon, Jun 8 2026, Praveen K Pandey wrote:
> ftrace: Add common library for C implementation

--- [PATCH 2/5] ---

> +/*\
> + * [Description]
> + *
> + * Test for kernel panic while using userstacktrace with page fault events.

The [Description] header is deprecated and must not be used. Remove
the `[Description]` line and start directly with the test description
text. The same applies to ftrace_regression02.c.

--- [PATCH 4/5] ---

> +static void cleanup(void)
> +{
> +	stop_testing = 1;
> +	ftrace_cleanup();
> +}

If the test is interrupted (e.g. SIGTERM on timeout), cleanup() is
called while stress threads may still be running. Setting stop_testing
does not guarantee threads have exited before ftrace_cleanup() frees
tracing_path and debugfs_path. Threads accessing those globals after
free is a use-after-free.

The fix is to join all threads in cleanup() before calling
ftrace_cleanup(), for example by calling stop_stress_tests() here
(guarded by thread_count > 0).

Verdict: Needs revision

---
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