On Fri, 2017-11-17 at 18:10 +0100, Jack Wang wrote: > It's production server, I was too late to gather more information. > kernel is 4.4.36/4.4.50 > Request mode for both multipath and scsi, no multiqueue involvement. Hello Jack, I haven't seen any lockups with the multipath + SRP and the legacy block and SCSI layers in a long time. So either something went wrong with backporting upstream fixes, an upstream fix has not been backported to kernel 4.4.36 or the lockup is caused by the SCSI LLD in your setup, e.g. a missing ->scsi_done() call. Since the srp-test software passes on your setup the latter may be the most likely. Bart.
