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    SubjectRe: [PATCH 1/1] ptrace: make sure do_wait() won't hang after PTRACE_ATTACH

    On Mon, Feb 14, 2011 at 04:06:56PM +0100, Oleg Nesterov wrote:
    > This was (very briefly) discussed recently. Probably we can implement
    > PTRACE_DETACH_RUNNING (the name is random) which doesn't require the
    > stopped tracee but ignores the "data" argument.

    I think the root problem is not how ptrace detaches but how ptrace
    attaches and stops tracee. If we have a clean way to seize the
    tracee, how we detach doesn't really matter. For example, a new
    ptrace call which stops the tracee and puts it in a ptrace command
    ready state without messing with the signal and group stop stuff.



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