[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 daniel.s):

 Hi,

 I'm having some issues with bans that might be related to this ticket.

 I'm running Varnish 4.0.3 with a configuration where we end up with lots
 of bans or with bans that affect lots of objects. After a day of use we
 have more than 400k bans in the list, most of them are completed but they
 are still in the list.

 The issue I'm seeing is that varnish eventually becomes really slow with
 an increased time to first byte from varnishncsa logs, the number of
 threads spikes until it hits the max and then we start dropping
 connections.  After a while, the situation recovers. But this keeps
 happening until we restart varnish.

 I haven't been able to find a strong correlation yet, but it seems to be
 related to having a huge amount of bans_lurker_tests_tested (which I'm not
 sure what it does)

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Ticket URL: <https://www.varnish-cache.org/trac/ticket/1635#comment:7>
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