On Wed, Oct 26, 2016 at 9:30 AM, Dave Jones [off-list ref] wrote:

I gave this a go last thing last night. It crashed within 5 minutes,
but it was one we've already seen (the bad page map trace) with nothing
additional that looked interesting.

Did the bad page map trace have any registers that looked like they
had 0xd0d0d0d0d0d0 in them?

I assume not, but worth checking.

Heisenbugs man, literally the worst.

I know you already had this in some email, but I lost it. I think you
narrowed it down to a specific set of system calls that seems to
trigger this best. fallocate and xattrs or something?

              Linus