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SubjectRe: 2.6.29.1: nfsd: page allocation failure - nfsd or kernel problem?
J. Bruce Fields wrote:
> On Wed, Jun 17, 2009 at 02:39:06PM +0400, Michael Tokarev wrote:
>> Justin Piszcz wrote:
>>>
>>> On Wed, 17 Jun 2009, Michael Tokarev wrote:
>>>
>>>> Michael Tokarev wrote:
>>>>> Justin Piszcz wrote:
>>>> ...
>>>>
>>>> Justin, by the way, what's the underlying filesystem on the server?
>>>>
>>>> I've seen this error on 2 machines already (both running 2.6.29.x
>>>> x86-64),
>>>> and in both cases the filesystem on the server was xfs. May this be
>>>> related somehow to http://bugzilla.kernel.org/show_bug.cgi?id=13375 ?
>>>> That one is different, but also about xfs and nfs. I'm trying to
>>>> reproduce the problem on different filesystem...
>>> Hello, I am also running XFS on 2.6.29.x x86-64.
>>>
>>> For me, the error happened when I was running an XFSDUMP from a client
>>> (and dumping) the stream over NFS to the XFS server/filesystem. This
>>> is typically when the error occurs or during heavy I/O.
>> Very similar load was here -- not xfsdump but tar and dump of an ext3
>> filesystems.
>>
>> And no, it's NOT xfs-related: I can trigger the same issue easily on

Note the NOT, in upper case ;)

>> ext4 as well. About 20 minutes of running 'dump' of another fs
>> to the nfs mount and voila, nfs server reports the same page allocation
>> failure. Note that all file operations are still working, i.e. it
>> produces good (not corrupted) files on the server.
>
> There's a possibly related report for 2.6.30 here:
>
> http://bugzilla.kernel.org/show_bug.cgi?id=13518

Does not look similar.

I repeated the issue here. The slab which is growing here is buffer_head.
It's growing slowly -- right now, after ~5 minutes of constant writes over
nfs, its size is 428423 objects, growing at about 5000 objects/minute rate.
When stopping writing, the cache shrinks slowly back to an acceptable
size, probably when the data gets actually written to disk.

It looks like we need a bug entry for this :)

I'll re-try 2.6.30 hopefully tomorrow.

/mjt


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