linux-kernel - Re: [PATCH liburing 1/1] test/defer: Test deferring with drain and links

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Date:   Fri, 25 Oct 2019 09:47:08 -0600
From:   Jens Axboe <axboe@...nel.dk>
To:     Pavel Begunkov <asml.silence@...il.com>,
        linux-block@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH liburing 1/1] test/defer: Test deferring with drain and
 links

On 10/25/19 9:40 AM, Pavel Begunkov wrote:
> On 25/10/2019 18:13, Jens Axboe wrote:
>> On 10/25/19 3:48 AM, Pavel Begunkov (Silence) wrote:
>>> From: Pavel Begunkov <asml.silence@...il.com>
>>>
>>> 1. test user_data integrity with cancelled links
>>> 2. test the whole link is cancelled by sq_thread
>>> 3. hunging io_uring based on koverflow and kdropped
>>>
>>> Be aware, that this test may leave unkillable user process, or
>>> unstopped actively polling kthread.
>>
>> That's fine, that's what the test suite is for! Thanks, applied.
> 
> Just found it "a bit uncomfortable", that after several runs
> my CPU was doing nothing but polling in vain.

Looks like it's testing one of the cases that isn't fixed that. We
shouldn't do that until a known fix is available, at least. Basically
the tests should test for things that used to be a problem, but are
now fixed.

But let's just get it fixed :-)

-- 
Jens Axboe