[PHP] pcntl_fork() hangs with FUTEX_WAIT

[Steve]

I have a program which creates a lot of children over the time, which 
terminate themselves after they are finished.

After some time however, the parent process hangs; apparently in 
pcntl_fork(). The child from this fork, however, seems to run normally. 
An strace on the parent shows "futex(0x471cb0, FUTEX_WAIT, 2, NULL"

The program runs on PHP 5.0.3-cli and Linux 2.6.
Has anyone an idea what could be the reason for that hang?
Thanks in advance,
Steve
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