Re: (subset) [PATCH 00/11] remove aux CQE caches

[Pavel Begunkov <asml.silence@gmail.com>]

On 3/16/24 13:56, Ming Lei wrote:
> On Sat, Mar 16, 2024 at 01:27:17PM +0000, Pavel Begunkov wrote:
>> On 3/16/24 11:52, Ming Lei wrote:
>>> On Fri, Mar 15, 2024 at 04:53:21PM -0600, Jens Axboe wrote:
> 
> ...
> 
>>> The following two error can be triggered with this patchset
>>> when running some ublk stress test(io vs. deletion). And not see
>>> such failures after reverting the 11 patches.
>>
>> I suppose it's with the fix from yesterday. How can I
>> reproduce it, blktests?
> 
> Yeah, it needs yesterday's fix.
> 
> You may need to run this test multiple times for triggering the problem:

Thanks for all the testing. I've tried it, all ublk/generic tests hang
in userspace waiting for CQEs but no complaints from the kernel.
However, it seems the branch is buggy even without my patches, I
consistently (5-15 minutes of running in a slow VM) hit page underflow
by running liburing tests. Not sure what is that yet, but might also
be the reason.

I'll repost it with the locking fix for reference, would make more
sense retesting ublk after figuring out what's up with the branch.


> 1) git clone https://github.com/ublk-org/ublksrv.git
> 
> 2) cd ublksrv
> 
> 3) make test T=generic/004

-- 
Pavel Begunkov