Re: 2.6.1-mm4

[Rusty Russell]

In message <20040117105239.0b94f2b3.akpm@xxxxxxxx> you write:
> Hugh Dickins <hugh@xxxxxxxxxxx> wrote:
> >  I was getting something like that on reboot a few days ago, I think it
> >  was with 2.6.1-mm2.  I had to move on before debugging it fully, but
> >  the impression I got (maybe vile calumny, sue me Rusty) was that the
> >  new kthread_create for 2.6.1-mm's ksoftirqd was leaving it vulnerable
> >  to shutdown kill, whereas other things (RCU in my traces) still needed
> >  it around and assumed its task address still valid.
> 
> Yes.  ksoftirqd and the migration threads can now be killed off
> with `kill -9'.

"That shouldn't happen".

We block and flush all signals in workqueue.c.  How is that kill -9
getting through?

It also implies that previously ksoftirqd and migration threads would
tight spin after kill -9, since they slept with TASK_INTERRUPTIBLE.

Will dig...
Rusty.
--
  Anyone who quotes me in their sig is an idiot. -- Rusty Russell.
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