On Tue, Jul 23, 2019 at 12:38:04PM +0800, Ming Lei wrote:

From the IO trace, discard command(nvme_cmd_dsm) is failed:

  kworker/15:1H-462   [015] .... 91814.342452: nvme_setup_cmd: nvme0: disk=nvme0n1, qid=7, cmdid=552, nsid=1, flags=0x0, meta=0x0, cmd=(nvme_cmd_dsm nr=0, attributes=4)
          <idle>-0     [013] d.h. 91814.342708: nvme_complete_rq: nvme0: disk=nvme0n1, qid=7, cmdid=552, res=0, retries=0, flags=0x0, status=8198

And the returned error code is 0x8198, I am not sure how to parse the
'Command Specific Status Values' of 0x98, maybe Christoph, Keith or our other
NVMe guys can help to understand the failure.

The 198h status code is still marked reserved in the latest spec for an
NVM command set, so not sure what to make of it. I think we would have
to refer back to the vendor.