Re: Infinite loop in task_dentry_path

[Henrik /KaarPoSoft <henrik at kaarposoft dot dk>]

On 05/22/2014 05:38 PM, David Smith wrote:
> On 05/09/2014 04:23 PM, Henrik /KaarPoSoft wrote:
> > On 05/09/2014 05:29 PM, David Smith wrote:
> > > On 05/08/2014 05:34 PM, Henrik /KaarPoSoft wrote:
> > Here is how to reproduce:
>
> Ah, that does reproduce the problem for me on a rawhide system (I
> haven't tried other places). When I add you patch to task_dentry_path(),
> it does get farther, but then I get a read fault. I'll have to dig deeper.
>
> > The patch is probably wrong, and I hope that someone more
> > knowledgeable than me may come up with a better one.
> >
> > However, if I look at the comment about task_dentry_path in
> > https://sourceware.org/git/gitweb.cgi?p=systemtap.git;a=blob;f=tapset/linux/dentry.stp
> >
> > it seems to me that is based on the kernel's d_path().
> >
> > And the comment in the top of
> > http://lxr.free-electrons.com/source/fs/dcache.c#L3052
> > says something about "synthetic filesystems",
> > and just maybe this is doing something to overcome the problem.
>
> Hmm, interesting. Thanks for the pointer.

I hope that you will be able to find a more generic solution
than my lame patch!

/Henrik