On Fri, Dec 01, 2017 at 04:49:31PM -0200, Mauricio Faria de Oliveira wrote:

Hi Bart,

On 12/01/2017 02:08 PM, Bart Van Assche wrote:

quoted

The test chenxiang ran does not prove that there is anything wrong with v2.
Maybe chenxiang hit the issue described inhttps://lkml.org/lkml/2017/9/5/381?

Unfortunately v2 has been found to exhibit another problem, an Oops in
the systemd shutdown path for device-mapper LVM volumes at least, when
calling 'q->request_fn(q)' if 'q->request_fn' is NULL.

That issue can be fixed easily in V2 and we understand DM's case clearly.

But the most important thing is that V2 can't fix Chenxiang's issue, but
V3/V1 can.


-- 
Ming