Re: WARNING at fs/nfs/write.c:743 nfs_inode_remove_request with -rc6

[Will Deacon]

On Tue, Sep 23, 2014 at 02:59:38PM +0100, Will Deacon wrote:
> On Tue, Sep 23, 2014 at 02:33:06PM +0100, Weston Andros Adamson wrote:
> > Any more info on how to reproduce this would be really great. Unfortunately I donât
> > have access to an arm64 system.
> 
> I've not spotted a pattern other than using 64k pages, yet. If I manage to
> get a reproducer, I'll let you know.
> 
> > If itâs possible, could we get a packet trace around when this happens? This is pure
> > speculation, but this might have something to do the resend path - a commit fails
> > and all the requests on the commit list have to be resent.
> 
> Sure, once I can reproduce it reliably, then I'll try to do that.

Right, a bunch of DDing from /dev/zero over an ssh session triggers this
very quickly. I've put a binary tcpdump here:

  http://www.willdeacon.ukfsn.org/bitbucket/oopsen/nfs/tcpdump.bin

You may want to filter out the ssh packets. The only `interesting' thing to
me is a retransmission about half way through, but I don't know what I'm
looking for.

The NFS server is 10.1.203.204 and the client is 10.1.203.24.

Will
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/