[Varnish] #1403: n_object becomes bogus every night

[Varnish]

#1403: n_object becomes bogus every night
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 Reporter:  scoof     |      Owner:
     Type:  defect    |     Status:  new
 Priority:  normal    |  Milestone:  Varnish 4.0-TP1
Component:  varnishd  |    Version:  trunk
 Severity:  normal    |   Keywords:
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 It looks looks like MAIN.n_object can drop below 0.
 Every night we see a pattern like this:
 2014.Jan.02 01:31:10    18446744073709548169
 2014.Jan.02 01:30:40    18446744073709549453
 2014.Jan.02 01:30:10    18446744073709551430
 2014.Jan.02 01:29:40    2686
 2014.Jan.02 01:29:10    4897
 2014.Jan.02 01:28:40    6441

 This is corrected by us hitting #1397 and restarting, but the pattern
 repeats every night around the same time.

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Ticket URL: <https://www.varnish-cache.org/trac/ticket/1403>
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