On 09.03.16 12:32:14, Robert Richter wrote:

On 08.03.16 17:31:05, Ard Biesheuvel wrote:

quoted

On 8 March 2016 at 09:15, Ard Biesheuvel [off-list ref] wrote:

quoted

I managed to reproduce and diagnose this. The problem is that vmemmap
is no longer zone aligned, which causes trouble in the zone based
rounding that occurs in memory_present. The below patch fixes this by
rounding down the subtracted offset. Since this implies that the
region could stick off the other end, it also reverts the halving of
the region size.

I have seen the same panic. The fix solves the problem. See enclosed
diff for reference as there was some patch corruption of the original.

So this is:

Tested-by: Robert Richter <redacted>

-Robert