[linux-lvm] Weird errors after fresh install

[linux-lvm] Weird errors after fresh install

[Raymond Jennings]

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http://privatepaste.com/2e7b78484f

Did I do something wrong here?  I haven't edited /etc/lvm/lvm.conf at all.

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Re: [linux-lvm] Weird errors after fresh install

[Peter Rajnoha]

On 08/07/2013 11:35 AM, Raymond Jennings wrote:
> http://privatepaste.com/2e7b78484f
> 
> Did I do something wrong here?  I haven't edited /etc/lvm/lvm.conf at all.
> 

We were discussing this exact problem on #lvm on freenode just yesterday
as someone else hit that. We've nailed this down to a problem with gcc
compiler and its optimisation. It happens if -O2 optimisation is used
during compilation, but it does not happen with -O1 nor -O0. Also, we
could not reproduce with gcc 4.7, but reproduced with 4.8.

We're just trying to find a quick workaround for this gcc problem at the
moment, stay tuned for latest lvm2 upstream changes...

Peter

Re: [linux-lvm] Weird errors after fresh install

[Peter Rajnoha]

On 08/08/2013 09:53 AM, Peter Rajnoha wrote:
> We've nailed this down to a problem with gcc
> compiler and its optimisation. It happens if -O2 optimisation is used
> during compilation, but it does not happen with -O1 nor -O0. Also, we
> could not reproduce with gcc 4.7, but reproduced with 4.8.

...also, it happens on 32-bit arch, and we did not reproduce on 64-bit.
What architecture are you using and what gcc version is used on your
distro? Can you confirm?

Peter

Re: [linux-lvm] Weird errors after fresh install

[Peter Rajnoha]

On 08/08/2013 09:56 AM, Peter Rajnoha wrote:
> On 08/08/2013 09:53 AM, Peter Rajnoha wrote:
>> We've nailed this down to a problem with gcc
>> compiler and its optimisation. It happens if -O2 optimisation is used
>> during compilation, but it does not happen with -O1 nor -O0. Also, we
>> could not reproduce with gcc 4.7, but reproduced with 4.8.

To get rid of these message until we find the workaround,
please, set config {checks = 0} in your lvm.conf.

Peter

Re: [linux-lvm] Weird errors after fresh install

[Raymond Jennings]

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If and when you guys post a bug report with gcc, could you post a copy of
it here?

I plan to follow the bug myself.

Gcc: 4.8.1, for the record.


On Thu, Aug 8, 2013 at 12:59 AM, Peter Rajnoha <prajnoha@redhat.com> wrote:

> On 08/08/2013 09:56 AM, Peter Rajnoha wrote:
> > On 08/08/2013 09:53 AM, Peter Rajnoha wrote:
> >> We've nailed this down to a problem with gcc
> >> compiler and its optimisation. It happens if -O2 optimisation is used
> >> during compilation, but it does not happen with -O1 nor -O0. Also, we
> >> could not reproduce with gcc 4.7, but reproduced with 4.8.
>
> To get rid of these message until we find the workaround,
> please, set config {checks = 0} in your lvm.conf.
>
> Peter
>

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Re: [linux-lvm] Weird errors after fresh install

[Raymond Jennings]

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By the way, I am spyro on freenode.


On Thu, Aug 8, 2013 at 5:33 PM, Raymond Jennings <shentino@gmail.com> wrote:

> If and when you guys post a bug report with gcc, could you post a copy of
> it here?
>
> I plan to follow the bug myself.
>
> Gcc: 4.8.1, for the record.
>
>
> On Thu, Aug 8, 2013 at 12:59 AM, Peter Rajnoha <prajnoha@redhat.com>wrote:
>
>> On 08/08/2013 09:56 AM, Peter Rajnoha wrote:
>> > On 08/08/2013 09:53 AM, Peter Rajnoha wrote:
>> >> We've nailed this down to a problem with gcc
>> >> compiler and its optimisation. It happens if -O2 optimisation is used
>> >> during compilation, but it does not happen with -O1 nor -O0. Also, we
>> >> could not reproduce with gcc 4.7, but reproduced with 4.8.
>>
>> To get rid of these message until we find the workaround,
>> please, set config {checks = 0} in your lvm.conf.
>>
>> Peter
>>
>
>

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Re: [linux-lvm] Weird errors after fresh install

[Peter Rajnoha]

On 08/09/2013 02:33 AM, Raymond Jennings wrote:
> If and when you guys post a bug report with gcc, could you post a copy
> of it here?
> 
> I plan to follow the bug myself

So finally we get to the source of the problem.
It's reported here:
https://bugzilla.redhat.com/show_bug.cgi?id=995446

The workaround we provide is to not use the "static"
qualifier for the string that is malformed by that bug
(and hence the optimizer is not touching it that much):

https://git.fedorahosted.org/cgit/lvm2.git/commit/?id=2f61478436a7ebe058ffad3f92e1c4dada0805d0

I'll update F19 shortly.

Peter

Re: [linux-lvm] Weird errors after fresh install

[Raymond Jennings]

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Thanks ^^

I meant though that I'd like to follow the upstream bug report with gcc


On Fri, Aug 9, 2013 at 4:48 AM, Peter Rajnoha <prajnoha@redhat.com> wrote:

> On 08/09/2013 02:33 AM, Raymond Jennings wrote:
> > If and when you guys post a bug report with gcc, could you post a copy
> > of it here?
> >
> > I plan to follow the bug myself
>
> So finally we get to the source of the problem.
> It's reported here:
> https://bugzilla.redhat.com/show_bug.cgi?id=995446
>
> The workaround we provide is to not use the "static"
> qualifier for the string that is malformed by that bug
> (and hence the optimizer is not touching it that much):
>
>
> https://git.fedorahosted.org/cgit/lvm2.git/commit/?id=2f61478436a7ebe058ffad3f92e1c4dada0805d0
>
> I'll update F19 shortly.
>
> Peter
>

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