Description of problem:

wait* syscall can sometimes return ECHILD though a multithreaded process child
exists and is in the process of exitting.

Version-Release number of selected component (if applicable):

2.6.9 or thereabouts.

How reproducible:
test program does 50 runs, usually happens in < 10 on 2-CPU machine

Steps to Reproduce:
1. gcc -g waitpidbug.c -lpthread -o waitpidbug
2. ./waitpidbug
3.
  
Actual results:
Will eventually say "Kill failed!", exit 1.

Expected results:
No such error from test program, exit 0.

Additional info:

Fix on the way.