[tor-bugs] #7912 [Tor]: Cells that don't get inserted into cell queues can clog connection flushing

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#7912: Cells that don't get inserted into cell queues can clog connection flushing
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 Reporter:  asn                     |          Owner:                    
     Type:  defect                  |         Status:  needs_revision    
 Priority:  normal                  |      Milestone:  Tor: 0.2.4.x-final
Component:  Tor                     |        Version:                    
 Keywords:  tor-relay 023-backport  |         Parent:                    
   Points:                          |   Actualpoints:                    
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Comment(by andrea):

 Destroy cells should go in a queue rather than always skipping to the head
 of the line.  Probably the easiest option here is to pretend we have a
 special virtual circuit for all 'control' cells like DESTROY on a channel,
 and schedule it with circuitmux like the other circuits.  Another
 possibility would be to schedule the cells for the circuit they affect;
 not sure if forcing a DESTROY to wait behind any data we have for that
 circuit would change semantics in a problematic way.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/7912#comment:17>
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