> When accessing a directory inode from a single other client, NFSv4
> callbacks catastrophically failed [1] on the NFS server with
> 2.6.23-rc4 (unpatched); clients are both 2.6.22 (Ubuntu Gutsy build).
> Seems not easy to reproduce, since this kernel was running smoothly
> for 7 days on the server.
>
> What information will help track this down, or is there a known
> failure mechanism?
I haven't seen that before.
> I can map stack frames to source lines with objdump, if that helps.
If it's still easy, it might help to figure out exactly where in
xprt_reserve() it died, and why. If we've got some race that can lead
to freeing the client while a callback is in progress, then perhaps this
is on the first dereference of xprt?
--b.
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