On Wed, Feb 28, 2018 at 04:45:23PM +0100, Paolo Pisati wrote:

Reproducible on 4.16-rc3 and 4.4.20 using defconfig - the failure it's
intermittent, but i could reproduce it 100% if i boot loop the kvm instance 
(it usually shows up in less than 10 iterations but i tested 32 boots before
marking it good).

[...]

Anything else i can do to help debug this?

If you could share the crash log, that would be helpful.

Cheers,

Will