Re: kill task in TASK_UNINTERRUPTIBLE

[Robert Love]

On Wed, 2002-05-08 at 13:23, Denis Vlasenko wrote:
> On 8 May 2002 12:01, Amol Lad wrote:
> > Hi,
> >  Is there any way i can kill a task in
> > TASK_UNINTERRUPTIBLE state ?
> 
> No. Everytime you see hung task in this state
> you see kernel bug.
> 
> Somebody correct me if I am wrong.

Generally correct.  Of course, what is "hung" ?

If it is just sitting in uninterruptible sleep, it could legitimately be
waiting for an event.  More than likely, however, after some sane period
of time something is broken.

So, yah, it is a kernel bug.

I'll expand on your answer too - _why_ can't we kill it?  Same argument
we had over saving the futexes if a process bails.  You hold a semaphore
because you are entering a critical section.  If you die in the middle,
who knows the state the data is in and you do _not_ want to reenter it.

	Robert Love