linux-kernel - Re: [Linux-v3.19-9526-ga135c717d5cd + vfs.git] blk_update

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Date:	Mon, 23 Feb 2015 08:16:05 +0100
From:	Sedat Dilek <sedat.dilek@...il.com>
To:	Jens Axboe <axboe@...com>
Cc:	"Martin K. Petersen" <martin.petersen@...cle.com>,
	Ming Lei <ming.lei@...onical.com>,
	LKML <linux-kernel@...r.kernel.org>,
	linux-fsdevel <linux-fsdevel@...r.kernel.org>
Subject: Re: [Linux-v3.19-9526-ga135c717d5cd + vfs.git] blk_update_request:
 I/O error, dev loop0

On Mon, Feb 23, 2015 at 5:33 AM, Jens Axboe <axboe@...com> wrote:
> On 02/22/2015 12:12 PM, Sedat Dilek wrote:
>>
>> On Sun, Feb 22, 2015 at 9:04 PM, Jens Axboe <axboe@...com> wrote:
>>>
>>> On Feb 22, 2015, at 12:02 PM, Sedat Dilek <sedat.dilek@...il.com> wrote:
>>>>
>>>>
>>>>> On Sun, Feb 22, 2015 at 5:06 PM, Jens Axboe <axboe@...com> wrote:
>>>>>>
>>>>>> On 02/22/2015 06:09 AM, Sedat Dilek wrote:
>>>>>>
>>>>>> Hi,
>>>>>>
>>>>>> when testing Linux-next (upcoming v3.20) I fell over similiar messages
>>>>>> when running fio here.
>>>>>>
>>>>>> This commit helped which is now upstream [1]...
>>>>>>
>>>>>> commit 9f9ee1f2b2f94f19437ae2def7c0d6636d7fe02e
>>>>>> "block: Quiesce zeroout wrapper"
>>>>>>
>>>>>> --- dmesg_3.19.0-9526.2-iniza-small_before-fio-2.2.5.txt
>>>>>> 2015-02-22 14:09:35.411824880 +0100
>>>>>> +++ dmesg_3.19.0-9526.2-iniza-small_after-fio-2.2.5.txt 2015-02-22
>>>>>> 14:10:25.327824500 +0100
>>>>>> @@ -853,3 +853,25 @@
>>>>>>   [  428.226000] Adding 36k swap on swapfile29.  Priority:-29
>>>>>> extents:1
>>>>>> across:36k FS
>>>>>>   [  469.339645] Process 7691(waitpid02) has RLIMIT_CORE set to 1
>>>>>>   [  469.339650] Aborting core
>>>>>> +[ 1877.189057] fio-testcase.sh (10238): drop_caches: 3
>>>>>> +[ 1882.250174] blk_update_request: I/O error, dev loop0, sector
>>>>>> 2883712
>>>>>> +[ 1882.807993] blk_update_request: I/O error, dev loop0, sector
>>>>>> 32460632
>>>>>> +[ 1884.655458] blk_update_request: I/O error, dev loop0, sector
>>>>>> 16869712
>>>>>> +[ 1884.656896] blk_update_request: I/O error, dev loop0, sector
>>>>>> 16854368
>>>>>> +[ 1884.659316] blk_update_request: I/O error, dev loop0, sector
>>>>>> 16855008
>>>>>> +[ 1884.660834] blk_update_request: I/O error, dev loop0, sector
>>>>>> 16869792
>>>>>> +[ 1884.661780] blk_update_request: I/O error, dev loop0, sector
>>>>>> 16854848
>>>>>> +[ 1884.663282] blk_update_request: I/O error, dev loop0, sector
>>>>>> 16855432
>>>>>> +[ 1884.664775] blk_update_request: I/O error, dev loop0, sector
>>>>>> 16859808
>>>>>> +[ 1884.671472] blk_update_request: I/O error, dev loop0, sector
>>>>>> 16866400
>>>>>> +[ 1892.239383] blk_update_request: 20 callbacks suppressed
>>>>>> +[ 1892.239389] blk_update_request: I/O error, dev loop0, sector
>>>>>> 7872768
>>>>>> +[ 1897.221576] blk_update_request: I/O error, dev loop0, sector
>>>>>> 23331008
>>>>>> +[ 1898.299271] blk_update_request: I/O error, dev loop0, sector
>>>>>> 25690688
>>>>>> +[ 1898.444161] blk_update_request: I/O error, dev loop0, sector
>>>>>> 25726496
>>>>>> +[ 1898.445946] blk_update_request: I/O error, dev loop0, sector
>>>>>> 25690832
>>>>>> +[ 1898.448185] blk_update_request: I/O error, dev loop0, sector
>>>>>> 25692312
>>>>>> +[ 1898.449321] blk_update_request: I/O error, dev loop0, sector
>>>>>> 25704840
>>>>>> +[ 1898.450314] blk_update_request: I/O error, dev loop0, sector
>>>>>> 25710392
>>>>>> +[ 1898.451351] blk_update_request: I/O error, dev loop0, sector
>>>>>> 25726080
>>>>>> +[ 1898.452348] blk_update_request: I/O error, dev loop0, sector
>>>>>> 25737608
>>>>>>
>>>>>> FYI: This is with Linux-v3.19-9526-ga135c717d5cd plus
>>>>>> vfs.git#for-linus.
>>>>>
>>>>>
>>>>>
>>>>> This really has nothing to do with commit 9f9ee1f2b2f, other than that
>>>>> they
>>>>> both have some block related messages. The above is normal IO errors on
>>>>> the
>>>>> device, we expect to see messages related to that. The question is
>>>>> mostly
>>>>> why you are seeing those. What are you running on the device?
>>>>>
>>>>> And is this a regression since 3.19?
>>>>
>>>>
>>>> OK, I mixed it up - I was on a hurry travelling back home.
>>>>
>>>> This is (still) a Ubuntu/precise AMD64 WUBI system where I did the
>>>> block-loopmq testing.
>>>>
>>>> It seems to be a regression since 3.19 (see my attached tarball).
>>>
>>>
>>> All I get is an attached file for a checksum, doesn't really help me in
>>> any way.
>>>
>>
>> It's 2 files, I have unpacked it and attached all single files.
>
>
> BTW, the other messages are the same (just the sha attached). And like Ming
> said, I don't see the warnings in the files you attached. So lets back it up
> a bit. A good bug report contains:
>
> 1) What was being run (kernel version)
> 2) What was run (fio command, in this case). This includes setup of how to
> reproduce.
> 3) Result
> 4) Expected result
>
> Otherwise it ends up being way too obtuse, people have to guess at what you
> (the reporter) thinks is wrong, in the cases where this isn't immediately
> obvious.
>
> So lets get back to basics on this one. What, in your opinion, has regressed
> in 4.0-rc1 compared to 3.19? And what is the exact test case?
>

As Linux v4.0-rc1 was released I will send you a new bug-report.

- Sedat -
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