re: kern/45647: kill from ddb broken

[Jared McNeill <jmcneill%invisible.ca@localhost>]

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You could probably just mutex_tryenter(&proc_lock) and print a message if 
it fails.

On Thu, 1 Dec 2011, matthew green wrote:

> > Trying to kill a process from ddb fails:
> >
> > db{1}> kill 0t507
> > Skipping crash dump on recursive panic
> > panic: kernel diagnostic assertion "mutex_owned(proc_lock)" failed: file 
> > "../../../../kern/kern_proc.c", line 590
>
> this is non trivial to solve.
>
> simply taking proc_lock (and more!) isn't going to work if some cpu
> was stopped mid-lock of these.
>
> perhaps a solution would be to have ddb create a thread that will go
> away that will send the signal asap...
>
>
> .mrg.
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