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Advice from Chris D. (from wikipedia): On modern UNIX-like systems (that comply with SUSv3 specification in this respect), the following special case applies: if the parent explicitly ignores SIGCHLD by setting its handler to SIG_IGN (rather than simply ignoring the signal by default) or has the SA_NOCLDWAIT flag set, all child exit status information will be discarded and no zombie processes will be left.
Is this an Ubuntu-bug? A apache bug? Where does it come from? Can we fix it? Seems to occur very spuriously.
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