Re: [Xen-users] Help with system

[Gilberto Nunes <gilberto.nunes@xxxxxxxxxxxxxxx>]

Hi...

First of all, I make a mistake when I mentioned the Xen version.... The correct is xen 3.1.2...
And yes, the kernel version I used here is centos.plusxen, come from CentOS Plus Mirror:

http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=centosplus

I just enable this on yum repo and upgrade system...

My system is already up of date....

I search from information on irc roons and google... So, I notice that this issue perhaps happen because I use a very recent version of Aoe-tools with old module kernels... (Yeah! I have aoe here.... I NAS Server with gigalan crossover cable between Dell PowerEdge 1950 and NAS server....
So, I have three or four vm with aoe partitions...)

I do not know if this true or not...

By the way,  I'll continue with my research and try fix this problem..

Thanks for help




Nuno L. Ferreira escreveu:

Olá Gilberto,

Not going to help much ... just to give some feedback.
I never saw that error, and I just installed a CentOS 54 x86_64 on a Quad AMD   server (it installs  xen 3.0.3, aka xen 3.1.2 or something) but I do not remember to have that error. I'm now with xen 3.4.2, and from xend.log I cannot see that BUG error.

The only think I notice different from what I'm used to see is your kernel : I have 2.6.18-164.15.1.el5xen, you have 2.6.18-164.15.1.el5.*centos.plusxen*
I expect that if you install a from a CentOS repo you will get the same kernel as me, but I'm wrong then.

Cheers,
N.

Gilberto Nunes wrote:

Hi...

I have install CentOS 5.4 with Xen 3.0.3...

I get this message from kernel:

Apr  5 09:59:14 zebra kernel: BUG: warning at lib/kref.c:32/kref_get() (Not tainted)
Apr  5 09:59:14 zebra kernel:
Apr  5 09:59:14 zebra kernel: Call Trace:
Apr  5 09:59:14 zebra kernel:  [<ffffffff8023824d>] kref_get+0x38/0x3d
Apr  5 09:59:14 zebra kernel:  [<ffffffff8025a440>] kobject_get+0x12/0x17
Apr  5 09:59:14 zebra kernel:  [<ffffffff8024b57f>] blk_get_queue+0x1f/0x26
Apr  5 09:59:14 zebra kernel:  [<ffffffff887198f7>] :blkbk:dispatch_rw_block_io+0x4db/0x5a2
Apr  5 09:59:14 zebra kernel:  [<ffffffff80340368>] __next_cpu+0x19/0x28
Apr  5 09:59:14 zebra kernel:  [<ffffffff8028792a>] find_busiest_group+0x1db/0x44d
Apr  5 09:59:14 zebra kernel:  [<ffffffff802883c0>] dequeue_task+0x18/0x37
Apr  5 09:59:14 zebra kernel:  [<ffffffff80288407>] deactivate_task+0x28/0x5f
Apr  5 09:59:14 zebra kernel:  [<ffffffff8026ef47>] monotonic_clock+0x35/0x7b
Apr  5 09:59:14 zebra kernel:  [<ffffffff80262dd3>] thread_return+0x6c/0x113
Apr  5 09:59:14 zebra kernel:  [<ffffffff80340af5>] kobject_cleanup+0x39/0x7e
Apr  5 09:59:14 zebra kernel:  [<ffffffff88719d2c>] :blkbk:blkif_schedule+0x36e/0x456
Apr  5 09:59:14 zebra kernel:  [<ffffffff887199be>] :blkbk:blkif_schedule+0x0/0x456
Apr  5 09:59:14 zebra kernel:  [<ffffffff8029bdab>] keventd_create_kthread+0x0/0xc4
Apr  5 09:59:14 zebra kernel:  [<ffffffff80233bef>] kthread+0xfe/0x132
Apr  5 09:59:14 zebra kernel:  [<ffffffff80260b2c>] child_rip+0xa/0x12
Apr  5 09:59:14 zebra kernel:  [<ffffffff8029bdab>] keventd_create_kthread+0x0/0xc4
Apr  5 09:59:14 zebra kernel:  [<ffffffff80233af1>] kthread+0x0/0x132
Apr  5 09:59:14 zebra kernel:  [<ffffffff80260b22>] child_rip+0x0/0x12
Apr  5 09:59:14 zebra kernel:

I do not know if this is a Xen Bug or CentOS or a Kernel BUG...

I use this kernel:  2.6.18-164.15.1.el5.centos.plusxen #1 SMP Wed Mar 17 20:32:20 EDT 2010 x86_64 x86_64 x86_64 GNU/Linux

But doesn't matter what kernel I use come from CentOS mirror with xen support...
I allways get that kernel message....

Somebody already have thi problem too???

Thanks for any advice...

--
Gilberto Nunes Ferreira
Suporte T.I.
Selbetti Gestão de Documentos
(47) 3441-6004 / (47) 8861-6672
Fax (47) 3441-6021
gilberto.nunes@xxxxxxxxxxxxxxx

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