Sripathi Kodi wrote:

> Can you test this patch please?
>
>> -- 
>> Regards Klaus
>
>
> Hi Klaus,
>
> I have tested your patch against my testcase and it seems to be alright.
>
> My testcase is right here in my first post on LKML about this: 
> http://lkml.org/lkml/2004/11/5/34! The essence of the testcase is two 
> threads racing in waitpid to collect the exit status of a child. 
> Sometimes the thread that loses this race gets stuck in waitpid 
> forever unless manually interrupted. I had been able to recreate this 
> problem only on a multiprocessor machine. The essence of the fix was 
> to make the thread that loses this race not to set 'flag =1'. The 
> patch you sent me does not alter this behavior, so it works alright.
>
> Thanks and regards,
> Sripathi.

I encountered a bug in waitpid after Sripathi's patch
was applied.
See lkml
"kernel reports kill too late? Thu Nov 18 2004 - 07:36:48 EST"

Attached is a patch for do_wait() that may fix both problems.

--
Regards Klaus