> On Feb 28, 2017, at 5:57 PM, Parav Pandit <pa...@mellanox.com> wrote:
>
> Hi Jens,
>
> With your commit 2af8cbe30531eca73c8f3ba277f155fc0020b01a in linux-block git
> tree,
> There are two requests tables. Static and dynamic of same size.
> However function blk_mq_tag_to_rq() always try to get the tag from the
> dynamic table which doesn't seem to be always initialized.
>
> I am running nvme-rdma initiator and it fails to find the request for the
> given tag when command completes.
> Command triggers error recovery with "tag not found" error.
> Eventually kernel is crashing in blk_mq_queue_tag_busy_iter() with NULL
> pointer. Seems to be additional bug in error recovery.
>
> To debug, I added initializing dynamic tags as well.
>
> blk_mq_alloc_rqs() {
> tags->static_rqs[i] = rq;
> + tags->rqs[i] = rq;
>
> This appears to resolve the issue. But that's not the fix.
> It appears to me that nvme stack is broken in certain conditions with recent
> static and dynamic rq tables change.
Can you try my for-linus branch?
