On Tue, Jun 10, 2025 at 08:54:25PM -0400, Steven Rostedt wrote:

+/**
+ * unwind_deferred_trace - Produce a user stacktrace in faultable context
+ * @trace: The descriptor that will store the user stacktrace
+ *
+ * This must be called in a known faultable context (usually when entering
+ * or exiting user space). Depending on the available implementations
+ * the @trace will be loaded with the addresses of the user space stacktrace
+ * if it can be found.

I am confused -- why would we ever want to call this on exiting
user-space, or rather kernel entry?

I thought the whole point was to request a user trace while in-kernel,
and defer that to return-to-user.