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SubjectRe: [patch] ptrace-fix-2.5.33-A1

there are two kinds of wait4 calls, one that gets the WIFSTOPPED event
from the debugged task, for this the traced task has to be in the
debugger's ->children list.

Another one is when a debugged task exits and its parent wants the exit
event. But in this case the task is untraced already, so it gets back into
the parent's ->children list.

ie. wait4 should only look at the ->children list - zombies (or traced
tasks debugged by this task) can only be there.

The only addition is that in the wait4 non-blocking case we need to look
at the traced list as well - since a non-blocking wait4 is a 'could there
be any children exiting' kind of query.

Ingo

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