Re: 4.14.9 doesn't boot (regression)

[Jiri Kosina]

On Fri, 29 Dec 2017, Linus Torvalds wrote:

> Ok, so what does seem to be consistent for everybody is that 
> double-fault in the NMI backtrace.
> 
> So the fact that the NMI always hits on a double-fault does make me
> suspect that it's a infinite stream of double-faults, and that is
> presumably also what causes the RCU timeout.

As I've been fighting with recursive double-faults lately (backporting PTI 
to ancient kernels), I can tell you that this is not the symptom you'd be 
seeing in such case; recursive double fault pretty quickly overflows the 
interrupt stack and triple-faults.

-- 
Jiri Kosina
SUSE Labs