Oleg Nesterov <[EMAIL PROTECTED]> writes: > ptrace_stop() decrements ->group_stop_count to "participate" in group stop. > This looks very wrong to me, the task can in fact decrement this counter > twice. > If the tracee returns to the user-space before other threads complete the > group > stop, it will notice TIF_SIGPENDING and do it again.
This is one of those interesting weird cases. The ptrace interface remains per task. So need to handle a simultaneous thread group stop and a per task stop. > > Another problem is that we don't set SIGNAL_STOP_STOPPED if the counter > becomes > zero. > > I must admit, I don't undestand the reason why this code was added, it is very > old. I haven't dug in enough yet to understand better, but it is my hunch we need to do something when we have both kinds of stop happening simultaneously. Eric -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
