infinite participant registration loop

[jmettraux]

As seen in http://ruote-irclogs.s3.amazonaws.com/log_2012-09-07.html

It would be sensible to have a fuse in such "if r = storage.x()" loops to immediately detect such issues (although here the "stack level too deep (SystemStackError)" was already a good indication (it was pain to locate though)).

The cause issue seems to be in ruote-mon, but easier identification is a must.

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