On Thu, Oct 21, 2021 at 01:03:33PM -0700, Andy Lutomirski wrote:

On Fri, Oct 8, 2021, at 4:55 PM, Kees Cook wrote:

quoted

This makes sure that wchan contains a sensible symbol when a process is
blocked. Specifically this calls the sleep() syscall, and expects the
architecture to have called schedule() from a function that has "sleep"
somewhere in its name. For example, on the architectures I tested
(x86_64, arm64, arm, mips, and powerpc) this is "hrtimer_nanosleep":

Is this really better than admitting that the whole mechanism is nonsense and disabling it?

We could have a fixed string for each task state and call it a day.

I consider this to be "future work". In earlier discussions it came up,
but there wasn't an obvious clean cost-free way to do this, so instead
we're just fixing the broken corner and keeping the mostly working rest
of it while cleaning up the weird edges. :)

-- 
Kees Cook