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Date:   Sun, 19 Feb 2017 20:02:26 -0700
From:   Jens Axboe <>
To:     James Bottomley <>,
        Bart Van Assche <>,
        Linus Torvalds <>
Cc:     "" <>,
        "" <>,
        Christoph Hellwig <>,
        Mike Snitzer <>
Subject: Re: [GIT PULL] Block pull request for- 4.11-rc1

On 02/19/2017 07:59 PM, Jens Axboe wrote:
> On 02/19/2017 07:12 PM, James Bottomley wrote:
>> On Sun, 2017-02-19 at 18:15 -0700, Jens Axboe wrote:
>>> On 02/19/2017 06:09 PM, Bart Van Assche wrote:
>>>> On 02/19/2017 04:11 PM, Jens Axboe wrote:
>>>>> - Removal of the BLOCK_PC support in struct request, and
>>>>> refactoring of
>>>>>   carrying SCSI payloads in the block layer. This cleans up the
>>>>> code
>>>>>   nicely, and enables us to kill the SCSI specific parts of
>>>>> struct
>>>>>   request, shrinking it down nicely. From Christoph mainly, with
>>>>> help
>>>>>   from Hannes.
>>>> Hello Jens, Christoph and Mike,
>>>> Is anyone working on a fix for the regression introduced by the 
>>>> BLOCK_PC removal changes (general protection fault) that I had 
>>>> reported three weeks ago? See also
>>> I don't think that's a regression in this series, it just triggers 
>>> more easily with this series. The BLOCK_PC removal fixes aren't 
>>> touching device life times at all.
>>> That said, we will look into this again, of course. Christoph, any
>>> idea?
>> We could do with tracing the bdi removal failure issue fingered both by
>> the block xfstests and Omar.  It's something to do with this set of
>> commits
>>> - Fixes for duplicate bdi registrations and bdi/queue life time
>>>   problems from Jan and Dan.
>> But no-one has actually root caused it yet.
> The above set from Jan and Dan fixed one set of issues around this, and
> the reproducer test case was happy as well. But we've recently found
> that there are still corner cases that aren't happy, Omar reported that
> separately on Friday. So there will be a followup set for that,
> hopefully intersecting with the issue that Bart reported.

Forgot to mention, that these cases exist in 4.0 and 4.6 as well, so
neither are a new problem with this series. The fixes from Jan and
Dan didn't close all of them.

Jens Axboe

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