On Fri, Dec 01, 2017 at 06:04:29PM +0100, Alban Browaeys wrote: > I initially reported as https://bugzilla.kernel.org/show_bug.cgi?id=198 > 023 . > > I have now bisected this issue to commit a6a252e6491443c1c1 "blk-mq- > sched: decide how to handle flush rq via RQF_FLUSH_SEQ". > > This is with an USB stick Sandisk Cruzer (USB Version: 2.10) I > regressed with. > systemctl restart systemd-udevd restores sanity. >From my investigation, looks the issue is in BFQ: https://marc.info/?l=linux-block&m=151214241518562&w=2 Could you apply the attached debug patch, run your test and provide us the log? Thanks, Ming
