RES: Dell R900 with kernel panics while doing DB backups

Eduardo Schoedler listas at esds.com.br
Thu Jan 12 11:03:43 CST 2012


Spike,

It's a 64-bit kernel (amd64).
Yes, this kernel panics occurs when I'm doing full DB backups.

Suggestions?

--
Eduardo Schoedler


> -----Mensagem original-----
> De: linux-poweredge-bounces at dell.com [mailto:linux-poweredge-
> bounces at dell.com] Em nome de Spike_White at Dell.com
> Enviada em: quinta-feira, 12 de janeiro de 2012 14:58
> Para: linux-poweredge at lists.us.dell.com
> Assunto: RE: Dell R900 with kernel panics while doing DB backups
> 
> Is this possibly a 32-bit kernel?  We used to get weekly kernel panics
> (due to low memory exhaustion) on our Linux DB servers.  But only during
> full DB backups.
> 
> Of course, it wasn't clear at all that it was due to low memory
> exhaustion.   While circling the drain and basically unresponsive, Linux
> kernels can't always do in-depth diagnostics.  :-)
> 
> Like you, we did memtest, everything else.  All came back clean. In
> retrospect, a kdump would have helped I suppose.
> 
> Anyway, after we went to 64-bit kernels on all Linux DB servers yrs ago,
> we have not seen a recurrence of that problem.
> 
> There's some tiny data structure movement you can do with some 32-bit
> kernel versions, move some structures from low kernel mem to high in order
> to relieve low mem pressure.  But that sounds like it'd be minimal help, a
> 64-bit kernel is the real answer.
> 
> Spike
> 
> 
> ----------------------------------------------------------------------
> 
> Message: 1
> Date: Thu, 12 Jan 2012 14:22:54 -0200
> From: "Eduardo Schoedler" <listas at esds.com.br>
> Subject: Dell R900 with kernel panics
> To: <linux-poweredge at dell.com>
> Message-ID: <002201ccd146$7477b5a0$5d6720e0$@esds.com.br>
> Content-Type: text/plain; charset="us-ascii"
> 
> Hi people,
> 
> 
> This is my first email in this list.
> Please forgive my bad english, I'm Brazilian.
> 
> I'm running one dedicated mysql server on Dell r900 with 2x Xeon E7310
> (quad-core each) and 16GB RAM, OS Gentoo Linux amd64.
> 
> When I do backups (dumps) of the databases, some kerne panics occurs:
> 
> 
> 
> # cat /var/log/message | grep kernel
> ....
> Jan  2 04:20:27 server kernel: [231912.188735] swapper: page allocation
> failure. order:1, mode:0x20 Jan  2 04:20:27 server kernel: [231912.188742]
> Pid: 0, comm: swapper Not tainted 2.6.39-gentoo-r4 #1 Jan  2 04:20:27
> server kernel: [231912.188745] Call Trace:
> Jan  3 04:11:16 server kernel: [317761.149866] swapper: page allocation
> failure. order:1, mode:0x20 Jan  3 04:11:16 server kernel: [317761.149873]
> Pid: 0, comm: swapper Not tainted 2.6.39-gentoo-r4 #1 Jan  3 04:11:16
> server kernel: [317761.149876] Call Trace:
> ...
> 
> I don't know more what to do, memtest say that is no problem.
> Any ideas?
> 
> Thanks in advance.
> 
> Best regards,
> 
> --
> Eduardo Schoedler
> 
> 
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