[tor-bugs] #28865 [Core Tor/sbws]: sbws keeps the number of AsyncResults less than the number of threads

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#28865: sbws keeps the number of AsyncResults less than the number of threads
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 Reporter:  teor           |          Owner:  (none)
     Type:  defect         |         Status:  new
 Priority:  Medium         |      Milestone:  sbws: 1.0.x-final
Component:  Core Tor/sbws  |        Version:  sbws: 1.0.2
 Severity:  Normal         |     Resolution:
 Keywords:                 |  Actual Points:
Parent ID:  #28663         |         Points:
 Reviewer:                 |        Sponsor:
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Comment (by juga):

 Replying to [ticket:28865 teor]:
 [...]
 > There are two different ways that this code blocks execution:
 > * when a result finishes, the `time.sleep(5)` call blocks the thread
 from getting a new `AsyncResult` for up to 5 seconds

 the main thread blocks, but not the workers.

 > * if `max_pending_results` `AsyncResult`s ever block, the process hangs

 and that would mean there's a deadlock or a bug somewhere else. Probably
 the cause (or at least the main one) is #28897.
 What i would to detect future bugs, is give a maximum timeout to both
 while loops, then print a backtrace and ask the user to open a ticket with
 the backtrace.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/28865#comment:1>
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