kern/121809: unable to umount

[barbara]

> barbara wrote:
> 
> > Today, after a reboot, I did the test again and the problem was still existing.
> > So I've rebuilt world+kernel again after updating the sources.
> > I still have to reboot to run make installworld but the problem seems gone after that. Is this possible? Maybe I've missed an error during the previous install(world)|(kernel) (?).
> > I'm going to reboot on the next minutes and repeat the test again.
> > If it will be all right, do you need other tests/info like booting the old kernel or update the sources at more or less the time they was updated yesterday? If so, please, tell me.
> 
> Hi Barbara,
> 
> The problem is known and we have a fix in development.  I'll follow up 
> with you once it's ready for testing.
> 
> Kris
> 

> barbara wrote:
> 
> > Today, after a reboot, I did the test again and the problem was still existing.
> > So I've rebuilt world+kernel again after updating the sources.
> > I still have to reboot to run make installworld but the problem seems gone after that. Is this possible? Maybe I've missed an error during the previous install(world)|(kernel) (?).
> > I'm going to reboot on the next minutes and repeat the test again.
> > If it will be all right, do you need other tests/info like booting the old kernel or update the sources at more or less the time they was updated yesterday? If so, please, tell me.
> 
> Hi Barbara,
> 
> The problem is known and we have a fix in development.  I'll follow up 
> with you once it's ready for testing.
> 
> Kris
> 

Ok Kris,
let me know!
In the meanwhile, I could add that, as I said, I was pretty sure that after the new makeworld+kernel, the problem was fixed. But I'm still able to reproduce it.
This is the sequence in my test case:
	
	# mount /dev/ad4s1e /mnt/bsd6
	# touch /mnt/bsd6/test
	# umount /mnt/bsd6
	# mount /dev/ad4s1e /mnt/bsd6
	# rm -f /mnt/bsd6/test
	# umount /mnt/bsd6
	umount: unmount of /mnt/bsd6 failed: Device busy

What tricked me into thinking that the problem was fixed, is the fact that if I skip the 3rd and 4th steps, all seems working as expected.

I've also collected (almost) all the informations asked by vwe, but from what I'm arguing you have yet enough elements.
Ask me if I'm wrong or if you need something else.

Cheers