[PATCH v2 1/4] nmi_backtrace: add more trigger_*_cpu_backtrace() methods

[Peter Zijlstra]

On Thu, Mar 17, 2016 at 03:55:57PM -0700, Paul E. McKenney wrote:
> The RCU stall-warn stack traces can be ugly, agreed.

Ugly isn't the problem, completely random bollocks that puts you on the
wrong path was more the problem.

It uses a stack pointer saved at some random time in the past to start
unwinding an active stack from. Completely and utter misery.