Infinite loop in task_dentry_path

[Henrik /KaarPoSoft]

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