[Varnish] #1635: Completed bans keep accumulating

[Varnish]

#1635: Completed bans keep accumulating
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 Reporter:  Sesse     |       Owner:
     Type:  defect    |      Status:  new
 Priority:  normal    |   Milestone:
Component:  varnishd  |     Version:  trunk
 Severity:  normal    |  Resolution:
 Keywords:  lurker    |
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Comment (by karlvr):

 Attempting to debug this:

 in `cache_ban.c`: `ban_cleantail` is being called, as expected. However
 the ban at the `ban_head` has a `refcount` > 0, which I guess means that
 there are objects in the cache that still refer to it?

 So am I correct in assuming that bans can only be deleted once there are
 no older objects in the cache? In which case perhaps the behaviour I'm
 observing, and others are observing above, is expected?

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Ticket URL: <https://www.varnish-cache.org/trac/ticket/1635#comment:6>
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