Re: Oops in prune_dcache (2.4.0-prerelease)

[Petr Vandrovec]

On  3 Jan 01 at 13:08, Udo A. Steinberg wrote:
> Alexander Viro wrote:
> >
> > In principle, it might be that d_find_alias() is broken. I don't see where
> > it could happen, but then I'm half-asleep right now...  While we are at it,
> > do you have
> 
> >         * autofs
> 
> Yes.
> 
> >         * knfsd
> >         * ncpfs
> 
> No, neither of these two.

I saw oopses in prune_dcache() during umount() of ncpfs circa 6 months
ago. As I was never able to reproduce problem, and it just stopped from
happenning as unexpected as it appeared, I never reported that. And
~2 times I got endless loop in d_prune_aliases() where it somewhat
happened that d_alias list looked like

1 -> 2 -> 3 -> 4 -> 2 -> 3 -> 4 ... (maybe after pruning d_count = 0
                                    entries...)

so it never stopped :-( But it really happened long long ago, I think
that sometime June-September 2000, and couple of logic changed since
then in both ncpfs and vfs.
                                    Best regards,
                                            Petr Vandrovec
                                            [e-mail]