Re: 2.6.37-next - kernel BUG at fs/dcache.c:1363

[Valdis . Kletnieks]

On Fri, 07 Jan 2011 00:12:09 +1100, Nick Piggin said:

> > Thanks. It actually passed in a dentry that appears to have already been
> > used for something. This is not exactly a nice thing for a filesystem to do
> > and probably indicates an underlying bug anyway (or at least something
> > the vfs doesn't guarantee the safety of).
> >
> > Taking a look now.
>
> This patch fixes it here

> config fs: avoid switching ->d_op on live dentry

> Switching d_op on a live dentry is racy in general, so avoid it. In this case
> it is a negative dentry, which is safer, but there are still concurrent ops
> which may be called on d_op in that case (eg. d_revalidate). So in general
> a filesystem may not do this. Fix configfs so as not to do this.

Confirming this patch fixes the crash I was seeing, so now I'm off to try to
finish bisecting my way through the other issue I was seeing...

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