[tor-bugs] #31653 [Core Tor/Tor]: padding machine sending padding from relay to client closes circuit

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#31653: padding machine sending padding from relay to client closes circuit
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 Reporter:  pulls                             |          Owner:  (none)
     Type:  defect                            |         Status:  new
 Priority:  Medium                            |      Milestone:  Tor:
                                              |  0.4.2.x-final
Component:  Core Tor/Tor                      |        Version:  Tor:
                                              |  0.4.1.5
 Severity:  Normal                            |     Resolution:
 Keywords:  wtf-pad circpad-researchers-want  |  Actual Points:
Parent ID:                                    |         Points:
 Reviewer:                                    |        Sponsor:
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Changes (by mikeperry):

 * keywords:  wtf-pad circpad => wtf-pad circpad-researchers-want


Comment:

 The #29494 implementation will change this codepath. It is reasonable for
 now to merge a workaround that just sets in_usec = 0 to ensure correct
 behavior for 0 delay in the meantime.

 There is roughly a 2/1000 chance of this happening during client rend
 circuit creation in production in 0.4.1.x (because the left edge of the
 histogram for that circuit type is 0ms and the right edge is 1000, and we
 roll the dice once on the client side and once on the relay side).

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/31653#comment:6>
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