From mboxrd@z Thu Jan  1 00:00:00 1970
From: NeilBrown <neilb@suse.com>
Subject: Re: [BUG] MD/RAID1 hung forever on freeze_array
Date: Tue, 13 Dec 2016 08:53:24 +1100
Message-ID: <87oa0gzuej.fsf@notabene.neil.brown.name>
References: <CAMGffE=1kp7gMhG+dFxTvhD6VkRuSfbuXbf9vYSWwGG+=vvhDA@mail.gmail.com> <87a8c20xpg.fsf@notabene.neil.brown.name> <CAMGffEkQ5puQEE0FVfLMV1of1OYOhLMhHdUTAy-YLYPkzBzjDg@mail.gmail.com>
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Sender: linux-raid-owner@vger.kernel.org
To: Jinpu Wang <jinpu.wang@profitbricks.com>
Cc: linux-raid@vger.kernel.org, Shaohua Li <shli@fb.com>, Nate Dailey <nate.dailey@stratus.com>
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On Tue, Dec 13 2016, Jinpu Wang wrote:

> On Mon, Dec 12, 2016 at 1:59 AM, NeilBrown <neilb@suse.com> wrote:
>> On Sat, Nov 26 2016, Jinpu Wang wrote:
>>> [  810.270860]  [<ffffffff813fc851>] blk_prologue_bio+0x91/0xc0
>>
>> What is this?  I cannot find that function in the upstream kernel.
>>
>> NeilBrown
>
> Hi Neil,
>
> blk_prologue_bio is our internal extension to gather some stats, sorry
> not informed before.

Ahhh.

....
> +       return q->custom_make_request_fn(q, clone);

I haven't heard of custom_make_request_fn before either.

> +}
>
> =EF=BC=A9=EF=BC=AD=EF=BC=A8=EF=BC=AF=EF=BC=8C it seems unrelated, but I w=
ill rerun my test without this change.

Yes, please re-test with an unmodified upstream kernel (and always
report *exactly* what kernel you are running.  I cannot analyse code
that I cannot see).

NeilBrown

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