Re: [PATCH v2 0/6] wchan: Fix ORC support and leaky fallback

[Peter Zijlstra]

On Wed, Sep 29, 2021 at 06:01:57PM -0700, Josh Poimboeuf wrote:

> - Should we use a similar sched wrapper for /proc/$pid/stack to make its
>   raciness go away?

Alternatively, can we make /stack go away? AFAICT the semantics of that
are far worse in that it wants the actual kernel stack of a task,
blocked or not, which is a total pain in the arse (not to mention a
giant infoleak and side-channel).

> - At the risk of triggering a much larger patch set, I suspect
>   get_wchan() can be made generic ;-)  It's just a glorified wrapper
>   around stack_trace_save_tsk().

Done that for you :-)