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From: Pavel Begunkov <[email protected]>
To: Jens Axboe <[email protected]>, Victor Stewart <[email protected]>
Cc: io-uring <[email protected]>
Subject: Re: bug with fastpoll accept and sqpoll + IOSQE_FIXED_FILE
Date: Tue, 2 Feb 2021 20:34:44 +0000	[thread overview]
Message-ID: <[email protected]> (raw)
In-Reply-To: <[email protected]>

On 02/02/2021 17:41, Pavel Begunkov wrote:
> On 02/02/2021 17:24, Jens Axboe wrote:
>> On 2/2/21 10:10 AM, Victor Stewart wrote:
>>>> Can you send the updated test app?
>>>
>>> https://gist.github.com/victorstewart/98814b65ed702c33480487c05b40eb56
>>>
>>> same link i just updated the same gist
>>
>> And how are you running it?
> 
> with SQPOLL    with    FIXED FLAG -> FAILURE: failed with error = ???
> 	-> io_uring_wait_cqe_timeout() strangely returns -1, (-EPERM??)

Ok, _io_uring_get_cqe() is just screwed twice

TL;DR
we enter into it with submit=0, do an iteration, which decrements it,
then a second iteration passes submit=-1, which is returned back by
the kernel as a result and propagated back from liburing...

-- 
Pavel Begunkov

  reply	other threads:[~2021-02-02 20:39 UTC|newest]

Thread overview: 24+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-02-02  5:36 bug with fastpoll accept and sqpoll + IOSQE_FIXED_FILE Victor Stewart
2021-02-02 11:05 ` Pavel Begunkov
2021-02-02 11:23   ` Pavel Begunkov
2021-02-02 16:18     ` Victor Stewart
2021-02-02 16:30       ` Victor Stewart
2021-02-02 16:44         ` Jens Axboe
2021-02-02 17:10           ` Victor Stewart
2021-02-02 17:24             ` Jens Axboe
2021-02-02 17:41               ` Pavel Begunkov
2021-02-02 20:34                 ` Pavel Begunkov [this message]
2021-02-02 20:48                   ` Jens Axboe
2021-02-02 20:56                     ` Pavel Begunkov
2021-02-03 11:49                       ` Pavel Begunkov
2021-02-04 16:50                         ` Jens Axboe
2021-02-05 12:46                           ` Pavel Begunkov
2021-02-05 14:42                             ` Jens Axboe
2021-02-05 14:49                               ` Pavel Begunkov
2021-02-02 17:46               ` Jens Axboe
2021-02-02 17:50                 ` Victor Stewart
2021-02-02 17:57                   ` Jens Axboe
2021-02-02 17:46               ` Victor Stewart
2021-02-02 17:21       ` Pavel Begunkov
2021-02-02 17:30         ` Victor Stewart
2021-02-02 17:45           ` Victor Stewart

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