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    SubjectRe: [RFC][PATCH][v2] Define/use siginfo_from_ancestor_ns()

    |
    | > +static inline int siginfo_from_ancestor_ns(siginfo_t *info)
    | > +{
    | > + return SI_FROMUSER(info) && (info->si_pid == 0);
    | > +}
    |
    | Yes, this is problem... I doubt we can rely on !si_pid here.
    | More on this later.

    BTW, rather than clearing SIG_FROM_USER in send_signal(), can we
    keep it till we dequeue the signal ? Yes, collect_signal() would
    need to consider this flag. But when we dequeue, we can note that
    it was from user and use that in the siginfo_from_ancestor() ?

    Sukadev


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