On Fri, 8 Jun 2012, Andrew Morton wrote:

OK.  I assume this bug has been there for quite some time.

Well the huge pages refcount tricks caused the issue.

How serious is it?  Have people been reporting it in real workloads?
How to trigger it?  IOW, does this need -stable backporting?

Possibly.

Also, someone forgot to document these:

				struct {
					unsigned inuse:16;
					unsigned objects:15;
					unsigned frozen:1;
				};

So far I thouight that the field names are pretty clear on their own.

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