Re: [uml-devel] [BUG] host fd leak when using hostfs

["Sven Köhler" <skoehler@upb.de>]

>>i mounted the directory /usr/portage from my host into my UML-machine
>>(also to /usr/portage). The directory is mounted read-only. After that,
>>i did "emerge -upD world" which must have accessed many many files.
>>emerge crashed with the exception "too many open files" and indeed, the
>>processes inside the UML cannot open any file anymore.
>>
>>If i do an "lsof" on the host, i see that the kernel-process has still
>>opened many many files from /usr/portage - too many files ;-)
>>
>>So this should be bug in hostfs, so that hostfs doesn't close files on
>>the host if they are closed inside the UML. Is there a fix for that
>>already?
> 
> Try the attached patch (for 2.6 only!), but please be very careful... there 
> could be subtle pitfall in the VFS making it have other problems. However 
> I've well understood what is the difference between 2.4 and 2.6 which makes 
> the difference.
> 
> What is your UML version? I got the same thing with 2.6.4 patch adapted onto 
> 2.6.6 (the 2.6.6-02 distributed on my page).

I think i used 2.6.6-um1 from the official download-page. I should have 
mentioned that in my first POST.

> for i in `find /mnt/usr/bin`; do cat $i >/dev/null; done

i think even "find /mnt/usr/bin" would habe been sufficient to reproduce 
the problem.


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