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Re: [linux-lvm] lvm_vg_create_lv_linear() stuck in dm_udev_wait()



Zdenek,
thank you for your reply.

I am using stock ubuntu natty:
2.6.38-8-server #42-Ubuntu SMP Mon Apr 11 03:49:04 UTC 2011 x86_64
x86_64 x86_64 GNU/Linux
and 2.02.66 is what comes with natty.

I will check the udev rules part further.

If I want to try the new LVM package, say LVM2.2.02.88.tgz, do I need
to do any update to the kernel, or will it work with my existing
kernel 2.6.38-8-server.

Thanks,
  Alex.

On Tue, Aug 23, 2011 at 2:44 PM, Zdenek Kabelac
<zdenek kabelac gmail com> wrote:
> Dne 21.8.2011 20:14, Alexander Lyakas napsal(a):
>> Greetings all,
>> on stock ubuntu natty, using liblvm 2.02.66, sometimes
>> lvm_vg_create_lv_linear () gets stuck in the following stack.
>>
>> #0  0x00007f3b9636a0f7 in semop () from /lib/x86_64-linux-gnu/libc.so.6
>> #1  0x00007f3b9606863c in dm_udev_wait () from /lib/libdevmapper.so.1.02.1
>> #2  0x00007f3b973df41b in ?? () from /lib/liblvm2app.so.2.2
>>
>
> dmsetup udevcomplete_all
>
> this should finish the execution of this command.
>
>>
>> I realize that somehow it is related to udev synchronization. In my
>> application, I have a udev monitor for "block" subsystem type, but
>> currently it does nothing with the events it receives (it calls
>> udev_monitor_receive_device(), udev_device_get_action() and then
>> udev_device_unref() for every event. I plan in the future to use it
>> for waking up other threads.
>>
>> Can somebody pls advise on how to investigate this issue. It does not
>> happen always.
>
>
> My assumption is - you Debian system is using non-upstream Debian deviation of
> udev rules and those are broken (I guess some related discussion might be googled)
>
> Another issue which is currently being explored is the namespace usage - but I
> think this is not related to the problem you are seeing.
>
> Anyway I'd strongly suggest to use newer lvm package (either build form CVS)
> or at least  Debian unstable version - as 2.02.66 is very old one.
>
> Zdenek
>
>


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