Re: nvmf regression with mq-deadline

quoted

Now I'm getting a NULL deref with nvme-rdma [1].

For some reason blk_mq_tag_to_rq() is returning NULL on
tag 0x0 which is io queue connect.

I'll try to see where this is coming from.
This does not happen with loop though...

That's because the loop driver does not rely on the
cqe.command_id to resolve the submitted request (I'll
fix that).

Looks like blk_mq_alloc_request_hctx was overlooked when
the back assignment of the request to the rq_map...

This patch solves the issue for fabrics:
--

diff --git a/block/blk-mq.c b/block/blk-mq.c
index d84c66fb37b7..9611cd9920e9 100644
--- a/block/blk-mq.c
+++ b/block/blk-mq.c

@@ -312,6 +312,7 @@ struct request *blk_mq_alloc_request_hctx(struct

request_queue *q, int rw,
                ret = -EWOULDBLOCK;
                goto out_queue_exit;
        }
+       alloc_data.hctx->tags->rqs[rq->tag] = rq;

        return rq;
--

If its agreed with everyone I'll send a proper patch
for this and the blk_mq_sched_setup fix?