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From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
To: <frey@cxau.zko.dec.com>, <linux-kernel@vger.kernel.org>
Subject: RE: kernel_thread vs. zombie
Date: Fri, 23 Mar 2001 00:33:55 +0100
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>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.




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