linux-kernel - Re: linux-next 0112 tree breaks fs DAX

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Date:   Tue, 17 Jan 2017 11:13:22 -0700
From:   Dave Jiang <dave.jiang@...el.com>
To:     Stephen Rothwell <sfr@...b.auug.org.au>,
        Xiong Zhou <xzhou@...hat.com>
Cc:     linux-nvdimm@...1.01.org, linux-fsdevel@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-next@...r.kernel.org,
        Andrew Morton <akpm@...ux-foundation.org>,
        "Zwisler, Ross" <ross.zwisler@...el.com>
Subject: Re: linux-next 0112 tree breaks fs DAX



On 01/17/2017 09:05 AM, Dave Jiang wrote:
> On 01/16/2017 03:45 AM, Stephen Rothwell wrote:
>> Hi Xiong,
>>
>> Just cc'ing Andrew.
>>
>> On Mon, 16 Jan 2017 17:29:16 +0800 Xiong Zhou <xzhou@...hat.com> wrote:
>>>
>>> On Fri, Jan 13, 2017 at 06:16:41PM +0800, Xiong Zhou wrote:
>>>> Hi,
>>>>
>>>> These cases "hang" when testing with -o dax mount option:
>>>> xfstests generic/030 generic/34{0,4,5,6} generic/198
>>>> (maybe more)
>>>>
>>>> The test programme holetest or aiodio keep running for a
>>>> long time. It's killable, but it seems never return.
>>>>
>>>> With both ext4 and xfs as fs.
>>>>
>>>> Without -o dax mount option, cases pass in seconds.
>>>>
>>>> 0111 tree passed the tests.
>>>>
>>>> sh-4.2# git log --oneline next-20170111..next-20170112 fs/dax.c
>>>> 0c9a7909dd13 mm, dax: change pmd_fault() to take only vmf parameter
>>>> f8dbc198d4ea mm, dax: make pmd_fault() and friends be the same as fault()  
>>>
>>> 0112 tree with above 2 commits reverted pass the tests.
>>
> 
> Thanks. I will debug.
> 

Xiong,
I think I reproduced the issue, but only on the second commit
0c9a7909dd13 and not the first one f8dbc198d4ea. Can you please confirm
that "f8dbc198d4ea mm, dax: make pmd_fault() and friends be the same as
fault()" is ok or the failure starts with that? Thanks!