Re: Finished threads remain as zombies on 2.6?

[Thomas Evans <tom@23palmer.net>]

I switched back to a previous kernel version that I ran for months.
I don't remember seeing zombie threads back then - the zombies still appear 
now - perhaps this is not a kernel issue, but rather a pthreads issue?

I gave up on reverting to stable - too many frightening messages.

Has anyone else seen these <defunct> threads hanging around?

...tom

The 'ps fax' I see:

 2066 ?        S      0:00  \_ /usr/sbin/mt-daapd
 2067 ?        S      0:00      \_ /usr/sbin/mt-daapd
 2062 ?        S      0:17 /usr/sbin/mt-daapd
 2064 ?        S      0:00  \_ /usr/sbin/mt-daapd
 2065 ?        S      0:00      \_ /usr/sbin/mt-daapd
 2183 ?        S      0:00      \_ /usr/sbin/mt-daapd
 2485 ?        Z      0:00      \_ [mt-daapd] <defunct>
 2486 ?        Z      0:00      \_ [mt-daapd] <defunct>
 2487 ?        Z      0:00      \_ [mt-daapd] <defunct>

and

 3779 ?        Ss     0:00 /usr/sbin/hpiod
 3784 ?        S      0:00  \_ /usr/sbin/hpiod
 3785 ?        S      0:00      \_ /usr/sbin/hpiod
 3869 ?        Z      0:00      \_ [hpiod] <defunct>
 3906 ?        Z      0:00      \_ [hpiod] <defunct>
 3912 ?        Z      0:00      \_ [hpiod] <defunct>
 3955 ?        Z      0:00      \_ [hpiod] <defunct>



On Sunday 28 August 2005 12:41 pm, Tom Evans wrote:
> Haven't run the script - but multithreaded programs been leaving zombies
> all over my machine using the 2.6.12.3 kernel.
>
> I am actually in the process of trying to determine what changed - I was
> using Debian unstable and am downgrading to stable at the moment.
>
> When I debug some of the program with zombies, it almost seems as if
> pthread_detach() is broken - when pthread_exit() is called, the thread
> entries stick around waiting for the parent thread to go away.
>
> ...tom
>