possible umount bugs (was Re: "Panic: unmount: dangling vnode")

[Chad Whitacre]

Kris,

> The rule of thumb is that user code should not cause kernel panics.

Good to know, thanks.


> But all software has bugs, of course.

Understood. This is just the first bug I've personally hit in FreeBSD in 
4 years of use. /me weeps for his lost innocence


>> Is it likely that known umount problems explain the other symptom 
>> ("umount: unmount of /backup failed: Device busy")?
> 
> That's completely standard and just means something still had a file
> open on that filesystem.  Use fstat or lsof to find out what.

Another good tip, thanks.


>> This is actually a production box, so I can't do too much testing on it. 
>> I may be able to install the patch, though, in which case I will report 
>> back.
> 
> Thanks.

Let me know if there's any other info besides a patch report that might 
be helpful.




chad