[tor-bugs] #8185 [Core Tor/Tor]: circuit_package_relay_cell(): Bug: outgoing relay cell has n_chan==NULL. Dropping.

[Tor Bug Tracker & Wiki]

#8185: circuit_package_relay_cell(): Bug: outgoing relay cell has n_chan==NULL.
Dropping.
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 Reporter:  mr-4                          |          Owner:
     Type:  defect                        |         Status:  needs_review
 Priority:  Medium                        |      Milestone:  Tor:
Component:  Core Tor/Tor                  |  0.2.9.x-final
 Severity:  Normal                        |        Version:  Tor:
 Keywords:  tor-relay, TorCoreTeam201604  |  0.2.4.9-alpha
Parent ID:                                |     Resolution:
 Reviewer:  isis                          |  Actual Points:
                                          |         Points:  medium
                                          |        Sponsor:
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Comment (by cypherpunks):

 This bug message depends circuit in question and data client plans to
 append there. If entry relay lost n_chan (connection to middle relay
 attached to used circuit) then it sends destroy cell to client. Such cell
 processed by `command_process_destroy_cell`, thus marks circuit for close,
 clears n_chan, while keeps strteams attached to marked for close circuit.
 If any those stream's data client plans to package before circuit freed
 then message triggered.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/8185#comment:24>
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