Messages in this thread |  | | Date | Wed, 18 Apr 2018 23:40:39 +0800 | From | Ming Lei <> | Subject | Re: PATCH V4 0/5 nvme-pci: fixes on nvme_timeout and nvme_dev_disable |
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On Wed, Apr 18, 2018 at 10:24:28PM +0800, jianchao.wang wrote: > Hi Ming > > On 04/17/2018 11:17 PM, Ming Lei wrote: > > Looks blktest(block/011) can trigger IO hang easily on NVMe PCI device, > > and all are related with nvme_dev_disable(): > > > > 1) admin queue may be disabled by nvme_dev_disable() from timeout path > > during resetting, then reset can't move on > > > > 2) the nvme_dev_disable() called from nvme_reset_work() may cause double > > completion on timed-out request > > > > So could you share us what your plan is about this patchset? > > Regarding to this patchset, it is mainly to fix the dependency between > nvme_timeout and nvme_dev_disable, as your can see: > nvme_timeout will invoke nvme_dev_disable, and nvme_dev_disable have to > depend on nvme_timeout when controller no response.
Do you mean nvme_disable_io_queues()? If yes, this one has been handled by wait_for_completion_io_timeout() already, and looks the block timeout can be disabled simply. Or are there others?
> Till now, some parts > of the patchset looks bad and seem to have a lot of work need to be done. > :)
Yeah, this part is much more complicated than I thought.
I think it is a good topic to discuss in the coming LSF/MM, and the NVMe timeout(EH) may need to be refactored/cleaned up, and current issues should be addressed in clean way.
Guys, are there other issues wrt. NVMe timeout & reset except for the above?
Thanks, Ming
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