[PATCH 0/1] ptrace: fix ptrace_signal() && STOP_DEQUEUEDinteraction

[Oleg Nesterov]

Another very annoying and ancient problem which needs the fix,
and any fix obviously adds the subtle user-visible changes.

In short, in general it is simply impossible to know whether
PTRACE_CONT(SIGSTOP) will stop the tracee or not.

ee77f075 "signal: Turn SIGNAL_STOP_DEQUEUED into GROUP_STOP_DEQUEUED"
makes the things better, at least STOP_DEQUEUED can't be set/cleared
by another thread, but still without this patch the behavior is not
clearly defined.

Oleg.

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