Re: librados AIO problem diagnostic

[Loic Dachary <loic@dachary.org>]

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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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-- 
Loïc Dachary, Artisan Logiciel Libre


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