Re: 2.2.0p6: autofs bug! unmountable filesystem

H. Peter Anvin (hpa@transmeta.com)
11 Jan 1999 18:02:07 GMT

Followup to: <Pine.LNX.3.96.990110214437.13411A-100000@ferret.lmh.ox.ac.uk>
By author: Chris Evans <chris@ferret.lmh.ox.ac.uk>
In newsgroup: linux.dev.kernel
>
> Hi,
>
> I can reproduce a autofs bug whereby the autofs filesystem cannot be
> unmounted.
>
> It is simple: first mount the autofs filesystem. I have RH5.2 so to do
> this I use /etc/rc.d/init.d/autofs start
>
> Now I mount my CD rom drive by doing cd /misc/cd
>
> This next step seems to break things. _Manually_ umount /misc/cd, rather
> than letting autofs timeout (before doing the the cwd will need to be
> moved from /misc/cd :-)
>
> Now, /misc cannot be unmounted, it is permanently reported as busy. Not
> good.
>

I actually suspect that if you re-mounted /misc/cd and let it time out
it would let you umount /misc; the problem is that a umount of
/misc/cd doesn't execute an rmdir() required to free up the pad
directory. I will play around and see if there is a reasonable way to
deal with this.

-hpa

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