RE: kernel_thread vs. zombie

[Benjamin Herrenschmidt <benh@kernel.crashing.org>]

>daemonize() makes calls that are all protected with the
>big kernel lock in do_exit(). All usages of daemonize have
>the big kernel lock held. So I guess it just needs it.
>
>Please let me know whether you have success if it makes
>a difference with having it held.

With a bit more experiments, I have this behaviour:

(I hold the kerne lock, daemonize(), and release the kernel lock, then do
my probe thing which takes a few seconds, and let the thread die by itself)

 - When started during boot (low PID (9)) It becomes a zombie
 - When started from a process that quits after sending the ioctl,
   it is correctly "garbage collected".
 - When started from a process that stays around, it becomes a zombie too

So something is not working, or I'm missing something obvious, or whatever...

Any clue ?

Ben.