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From: Marko Rauhamaa <marko.rauhamaa@f-secure.com>
To: Amir Goldstein <amir73il@gmail.com>
CC: linux-fsdevel <linux-fsdevel@vger.kernel.org>,
        Jan Kara <jack@suse.cz>
Subject: Re: Reproducible, long-standing fanotify+autofs problem
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Date: Wed, 25 Jan 2017 16:42:34 +0200
In-Reply-To: <CAOQ4uxg6hDdgKhw6DZ2CUEf1e=PMx0t83RG-EaGLWDKf6MWUrQ@mail.gmail.com>
        (Amir Goldstein's message of "Wed, 25 Jan 2017 16:11:06 +0200")
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Amir Goldstein <amir73il@gmail.com>:

> On Wed, Jan 25, 2017 at 4:06 PM, Marko Rauhamaa
> <marko.rauhamaa@f-secure.com> wrote:
>> Amir Goldstein <amir73il@gmail.com>:
> So I am confused.
> Your test program sets a watch on permission events on the mount
> and does not respond to permission events on the mount, so all
> file system operations on the mount SHOULD be blocked.
> What am I missing?

The problem is that the fanotify_mark() system call is hanging and as a
side effect blocks everything.

The side effect is probably completely understandable, but
fanotify_mark() should never hang, should it?


Marko

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