linux-kernel - Re: Kernel 2.6.38.6 page allocation failure (ixgbe)

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Date:	Tue, 10 May 2011 17:55:58 +0200
From:	Stefan Majer <stefan.majer@...il.com>
To:	Yehuda Sadeh Weinraub <yehudasa@...il.com>
Cc:	linux-net@...r.kernel.org, linux-kernel@...r.kernel.org,
	ceph-devel@...r.kernel.org
Subject: Re: Kernel 2.6.38.6 page allocation failure (ixgbe)

Hi,

On Tue, May 10, 2011 at 4:20 PM, Yehuda Sadeh Weinraub
<yehudasa@...il.com> wrote:
> On Tue, May 10, 2011 at 7:04 AM, Stefan Majer <stefan.majer@...il.com> wrote:
>> Hi,
>>
>> im running 4 nodes with ceph on top of btrfs with a dualport Intel
>> X520 10Gb Ethernet Card with the latest 3.3.9 ixgbe driver.
>> during benchmarks i get the following stack.
>> I can easily reproduce this by simply running rados bench from a fast
>> machine using this 4 nodes as ceph cluster.
>> We saw this with stock ixgbe driver from 2.6.38.6 and with the latest
>> 3.3.9 ixgbe.
>> This kernel is tainted because we use fusion-io iodrives as journal
>> devices for btrfs.
>>
>> Any hints to nail this down are welcome.
>>
>> Greetings Stefan Majer
>>
>> May 10 15:26:40 os02 kernel: [ 3652.485219] cosd: page allocation
>> failure. order:2, mode:0x4020
>
> It looks like the machine running the cosd is crashing, is that the case?

No the machine is still running. Even the cosd is still there.

> Are you running both ceph kernel module on the same machine by any
> chance? If not, it can be some other fs bug (e.g., the underlying
> btrfs). Also, the stack here is quite deep, there's a chance for a
> stack overflow.

There is only the cosd running on these machines. We have 3 seperate
mons and clients which uses qemu-rbd.


> Thanks,
> Yehuda
>


Greetings
-- 
Stefan Majer
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