Re: librados AIO problem diagnostic

[Loic Dachary <loic@dachary.org>]

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Hi Sebastien,

Have you been able to reproduce it or did it vanish again ? This is a tricky one ;-)

Cheers

On 02/10/2014 16:58, Loic Dachary wrote:
> 
> 
> On 02/10/2014 16:31, Sebastien Ponce wrote:
>> As mentioned in the bug, I was a bit fast in concluding I could
>> reproduce the problem. I can reproduce the original one, but not the
>> remaining issue once the fix was applied.
>>
>> Loic, can you confirm that you are using the wip-9356 branch of repo
>> git@github.com:sponce/ceph.git ?
> 
> Yes. I'm able to reproduce the problem with 0daddfbf1164d6ba3f38eee29d2f11acfa62f2b6 from your tree https://github.com/sponce/ceph.git which is the head of wip-9356
> 
> Cheers
> 
>>
>> Sebastien
>>
>>
>> On Thu, 2014-10-02 at 11:49 +0200, Sebastien Ponce wrote:
>>> Hurray, I manage to seg fault ! (sounds odd this sentence...)
>>> So indeed, fresh ubuntu, debug mode does it. What I've also changed in
>>> the meantime is the type of machine. It's still virtual, but more
>>> powerful (4 cores).
>>>
>>> Let's debug it now...
>>>
>>> Sebastien
>>>
>>>
>>> On Wed, 2014-10-01 at 15:09 +0200, Sebastien Ponce wrote:
>>>> Ok, we are getting closer then.
>>>> I'll try to reinstall the ubuntu machine and run with -g.
>>>>
>>>> Sebastien
>>>>
>>>> On Wed, 2014-10-01 at 15:08 +0200, Loic Dachary wrote:
>>>>>
>>>>> On 01/10/2014 13:37, Sebastien Ponce wrote:
>>>>>> I've tried it on the RHEL6 like machine, but no luck. Or should I say I
>>>>>> was lucky ? Anyway no crash.
>>>>>>
>>>>>> Discussing with Dan Van Der Ster, he told me that he had once the case
>>>>>> where the crash was there or not depending on the libc version. Just in
>>>>>> case, what are you using ? On the machine I've used this morning, it's
>>>>>> glibc-2.12-1.107.el6.x86_64
>>>>>
>>>>> I'm using 
>>>>>
>>>>> ii  libc-bin                                              2.19-0ubuntu3 
>>>>>
>>>>> and I do not have glibc installed. I'm quite sure you can reproduce the problem on a fresh Ubuntu 14.04 with the following
>>>>>
>>>>> ./autogen.sh ; ./configure --disable-static --with-debug CFLAGS="-Wall -g" CXXFLAGS="-Wall -g"
>>>>>
>>>>> it fails consistently in my container. When I try with ./configure it does not fail. Something is going on when there is -g instead of the default flags. I checked that --disable-static and --with-debug make no difference.
>>>>>
>>>>> Cheers
>>>>>
>>>>>>
>>>>>> Sebastien
>>>>>>
>>>>>> On Wed, 2014-10-01 at 10:31 +0200, Loic Dachary wrote:
>>>>>>> Hi,
>>>>>>>
>>>>>>> On 01/10/2014 09:28, Sebastien Ponce wrote:
>>>>>>>> Thanks for this effort !
>>>>>>>> I'll look at all that this afternoon (it's mid morning here).
>>>>>>>
>>>>>>> Same here : I'm in Paris ;-)
>>>>>>>
>>>>>>>> Concerning configure and autogen, I do the standard (naive ?)
>>>>>>>> "./autogen.sh; ./configure; make" given by the readme.
>>>>>>>
>>>>>>> Could you try with
>>>>>>>
>>>>>>> ./autogen.sh ; ./configure --disable-static --with-debug CC='ccache gcc' CXX='ccache g++' CFLAGS="-Wall -g" CXXFLAGS="-Wall -g" ; make
>>>>>>>
>>>>>>> and let me know if you see a problem when running
>>>>>>>
>>>>>>> cd src
>>>>>>> rm -fr dev out ;  mkdir -p dev ; CEPH_NUM_MON=1 CEPH_NUM_OSD=3 ./vstart.sh -d -n -X -l mon osd
>>>>>>> ./ceph_test_rados_striper_api_aio
>>>>>>>
>>>>>>> I'm trying with your "./configure" on my end to check if this changes something.
>>>>>>>
>>>>>>> It's going to be a fun one ;-)
>>>>>>>
>>>>>>> Cheers
>>>>>>>
>>>>>>>>
>>>>>>>> Sebastien
>>>>>>>>
>>>>>>>>
>>>>>>>> On Wed, 2014-10-01 at 09:01 +0200, Loic Dachary wrote:
>>>>>>>>> Hi Sebastien,
>>>>>>>>>
>>>>>>>>> In the context of http://tracker.ceph.com/issues/9356 I'm trying to collect as much information as I can in an environment that can be reconstructed to avoid interferences. Could you please let me know which ./configure line you are using ? Or which do_autogen.sh command you are using.
>>>>>>>>>
>>>>>>>>> Thanks in advance :-)
>>>>>>>>>
>>>>>>>>
>>>>>>>>
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>>>>>>>
>>>>>>
>>>>>>
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>>>>>
>>>>
>>>>
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>>>
>>>
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>>
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> 

-- 
Loïc Dachary, Artisan Logiciel Libre


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