Re: nfsd: page allocation failure - nfsd or kernel problem?

From: Michael Tokarev
Date: Wed Jun 17 2009 - 16:25:11 EST

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 ?
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

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:

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.

To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at
Please read the FAQ at