On Wed, Nov 28, 2018 at 11:08:48AM +0100, Christoph Hellwig wrote:

On Wed, Nov 28, 2018 at 06:07:01PM +0800, Ming Lei wrote:

quoted

quoted

Is this the nvme target on top of null_blk?

Yes.

And it goes away if you revert just the last patch?

It looks like a problem existed before that last patch. Reverting it
helps only if the request happened to have not been reallocated. If it
had been reallocated, the NULL_IRQ_TIMER would have completed the wrong
request out-of-order. If this were a real device, that'd probably result
in data corruption.