Re: [PATCH BUGFIX 1/1] block, bfq: add requeue-request hook

[Mike Galbraith]

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));