Re: stuck nfsd processes with 2.6.24-rc2

["J. Bruce Fields" <bfields@fieldses.org>]

On Tue, Nov 13, 2007 at 08:07:55PM +0100, Christian Kujau wrote:
> I noticed that I cannot use kernel nfsd any more with 2.6.24-rc2, last 
> working kernel as of now is 2.6.23.1. First I was using nfsv4 but switching 
> to nfsv3 did not help either: exported shares can be mounted (client: 
> 2.6-git/powerpc32, nfs-common-1.1.1~git-20070709-3ubuntu1), but running "ls 
> /mountpoint" (even without "-l") on the client is enough to get the [nfsd] 
> processes in "D" state.
> Restarting the rpc.nfsd process on the does not help much, the new rpc.nfsd 
> processes get stuck quickly.
>
> For more details please see http://nerdbynature.de/bits/2.6.24-rc2/nfsd/
>
> I haven't seen this particular issue on the list recently, hence my post.
> I'll try to git-bisect my way through the changesets, but it'll take some 
> time...

Could you get a sysrq-T trace?  (First get the [nfsd] processes in [D]
state.  Then type sysrq-T, or "echo t >/proc/sysrq-trigger".  Then
extract the stuff that's dumped to the logs.)

--b.