Re: Reproducible, long-standing fanotify+autofs problem

[Marko Rauhamaa <marko.rauhamaa@f-secure.com>]

Amir Goldstein <amir73il@gmail.com>:

> On Wed, Jan 25, 2017 at 1:48 PM, Marko Rauhamaa
> <marko.rauhamaa@f-secure.com> wrote:
>> We have run into an easily reproducible fanotify hang that affects
>> several distros as well as the latest development kernel. (It isn't
>> fixed by Amir Goldstein's recent fanotify patch, BTW.)
>
> Not sure what is the role that autofs is playing in this hang, but it
> is worth checking if Jan's latest work fixes the problem. I estimate
> that it should, because it isolated the user space handling of
> permission events from affecting processes generating fsnotify events
> on other fs objects.
>
> git://git.kernel.org/pub/scm/linux/kernel/git/jack/linux-fs.git #for_testing

I could try.

>>   4. Observe the last command hang. While it is hung, other file system
>>      operations from other processes are blocked.
>
> You mean other processes not trying to access objects under the
> watched mounts. right?

No, accessing the watched mounts. Don't know if the hang is limited to
them.


Marko