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parent router leaks file descriptors

[I sent this a few days ago but apparently it got lost]
[Failed second time, possibly example message triggered spam filter?]

I was bitten by a problem: when child routers die (with segfault, I am
attaching a message that triggers this) the parent preocess forks a new
child but in process of that, it eventually runs out of file descriptors
and fails to start any more children.  Then it starts to just busyloop
on pipe() call (if memory serves; anyway on some call that fails with
indication of no more descriptors).

This is a header of a message causing segfault:

[not including the message this time]

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