linux-kernel - Re: mount.nfs: cannot allocate memory

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Date:	Tue, 12 Jun 2012 19:46:18 -0400
From:	Mark Lord <kernel@...savvy.com>
To:	"Myklebust, Trond" <Trond.Myklebust@...app.com>
CC:	Linux Kernel <linux-kernel@...r.kernel.org>,
	"davej@...hat.com" <davej@...hat.com>,
	"J. Bruce Fields" <bfields@...ldses.org>,
	Ben Hutchings <bhutchings@...arflare.com>
Subject: Re: mount.nfs: cannot allocate memory

On 12-06-12 07:28 PM, Myklebust, Trond wrote:
> On Tue, 2012-06-12 at 19:08 -0400, Mark Lord wrote:
>> On 12-06-12 06:58 PM, Mark Lord wrote:
>>> Adding Ben Hutchings to CC: as he seems to have looked into this before.
>>>
>>>> On 12-06-12 06:44 PM, Mark Lord wrote:
>>>>> I've been seeing these messages on my AMD Fusion server
>>>>> running linux-3.3.7-64bit.  Does this ring any bells for anyone else?
>>>>> The system is NOT low on memory.
>>>>>
>>>>> I'm building/installing 3.4.2 now to see if it behaves any better.
>>>>>
>>>>> [962841.265658] mount.nfs: page allocation failure: order:4, mode:0xc0d0
>>>>> [962841.265674] Pid: 32116, comm: mount.nfs Not tainted 3.3.7 #2
>>>>> [962841.265680] Call Trace:
>>>>> [962841.265700]  [<ffffffff81079363>] ? warn_alloc_failed+0x11a/0x12d
>>>>> [962841.265713]  [<ffffffff8107b904>] ? __alloc_pages_nodemask+0x6c0/0x702
>>>>> [962841.265725]  [<ffffffff8114fcb8>] ? timerqueue_del+0x53/0x63
>>>>> [962841.265758]  [<ffffffff8107b9ba>] ? __get_free_pages+0x10/0x3f
>>>>> [962841.265805]  [<ffffffffa01ea33d>] ? nfs_idmap_new+0x28/0xde [nfs]
>>>>> [962841.265836]  [<ffffffffa01c79c9>] ? nfs4_init_client+0x74/0x12a [nfs]
>> ...
>>>> Looks like an old bug, perhaps:
>>>> https://bugzilla.redhat.com/show_bug.cgi?id=593035
>>>> https://bugzilla.redhat.com/show_bug.cgi?id=728003
>>>>
>>>> I wonder what the underlying cause is?
>>>> And I also wonder if the NFS code should be more clever
>>>> about handing order-4 allocation failures.
>>>
>>> More references:
>>> http://www.mail-archive.com/debian-kernel@lists.debian.org/msg71281.html
>>> https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1004619
>>> http://codemonkey.org.uk/2012/02/17/fedora-16-kernel-bugzilla-status-report-20120210-20120217/
>>> https://lkml.org/lkml/2011/2/24/73
>>
>> Ahh.. this one seems to explain it, kind of:
>>    http://permalink.gmane.org/gmane.linux.nfs/41686
>>
>> So in 3.3.7, I didn't have CONFIG_NFS_USE_NEW_IDMAPPER enabled,
>> and the kernel seems to be buggy without that.
>>
>> In 3.4.2, that option has disappeared entirely,
>> most likely because it is now the default behaviour.  Right?
> 
> Yes, but we also added some patches to Linux 3.4 in order to fix this
> bug.
> 
> Please see commit d073e9b541e1ac3f52d72c3a153855d9a9ee3278 (NFSv4:
> Reduce the footprint of the idmapper) and commit
> 685f50f9188ac1e8244d0340a9d6ea36b6136cec (NFSv4: Further reduce the
> footprint of the idmapper)

Ah, okay.  Good work, guye.

Cheers
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