On Wed, 2018-02-07 at 10:45 +0100, Paolo Valente wrote: > > > Il giorno 07 feb 2018, alle ore 10:23, Mike Galbraith <efault@xxxxxx> ha scritto: > > > > On Wed, 2018-02-07 at 10:08 +0100, Paolo Valente wrote: > >> > >> The first piece of information I need is whether this failure happens > >> even without "BFQ hierarchical scheduling support". > > > > I presume you mean BFQ_GROUP_IOSCHED, which I do not have enabled. > > > > Great (so to speak), this saves us one step. > > So, here's my next request for help: please apply the attached patch > (compressed to preserve it from my email client) and retry. It adds > several anomaly checks. I hope I have not added any false-positive > check. kernel BUG at block/bfq-iosched.c:4742! 4742 BUG_ON(!(rq->rq_flags & RQF_ELVPRIV));
