Re: [PATCH v2] io-wq: handle hashed writes in chains

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

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On 22/03/2020 23:15, Jens Axboe wrote:
> On 3/22/20 2:05 PM, Jens Axboe wrote:
>> On 3/22/20 1:51 PM, Jens Axboe wrote:
>>>> Please, tell if you see a hole in the concept. And as said, there is
>>>> still a bug somewhere.
>>
>> One quick guess would be that you're wanting to use both work->list and
>> work->data, the latter is used by links which is where you are crashing.
>> Didn't check your list management yet so don't know if that's the case,
>> but if you're still on the list (or manipulating it after), then that
>> would be a bug.
> 
> IOW, by the time you do work->func(&work), the item must be off the
> list. Does indeed look like that's exactly the bug you have.
> 

Good guess. I made sure to grab next before ->func(), see next_hashed. And it's
not in @work_list, because io_get_next_work() removes it. However, somebody may
expect it to be NULL or something. Thanks! I'll check it

-- 
Pavel Begunkov


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