Re: Unkillable Zombie process under 2.6.3 and 2.6.4

[David Fort <david.fort@irisa.fr>]

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Andrew Morton wrote:

>Would you have time to prepare a little test app to demonstrate this?
>
>Thanks.
>
>  
>
I've wrote this little app that do nothing complicated: it just launch a 
thread that do popen in its body.
This programs sticks gdb completly, i don't know who is to blame gdb or 
the kernel.
The fact is that there's something really strange here.
I'm trying to build a test app that can trigger the case where GDBed 
process become unkillable zombies
(i have some still running on my box).

I've explored several ideas i had:
    -related to TLS -> playing around with the tlsData var didn't show 
anything
    -SIGCHLD intercepted by the program and not caught by gdb -> even 
without the signal handler i get the
    bug

I'm gonna modify the app to test that the apps doesn't become unkillable 
when it has a socket in WAIT_STATE.
   
Attached is a tarbal that contains:  the program, the makefile and a 
quite long report of the behaviour that i'm
seeing while debugging and my .config.

gcc version 3.3.2 (Mandrake Linux 10.0 3.3.2-6mdk)
glibc-2.3.3-10mdk
2.6.4 kernel

-- 
Fort David, Projet IDsA
IRISA-INRIA, Campus de Beaulieu, 35042 Rennes cedex, France
Tél: +33 (0) 2 99 84 71 33



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