[tor-bugs] #21576 [Core Tor]: Bug: Assertion linked_dir_conn_base failed in connection_ap_handshake_send_begin

[Tor Bug Tracker & Wiki]

#21576: Bug: Assertion linked_dir_conn_base failed in
connection_ap_handshake_send_begin
-----------------------------+--------------------------
     Reporter:  alecmuffett  |      Owner:
         Type:  defect       |     Status:  new
     Priority:  Medium       |  Milestone:
    Component:  Core Tor     |    Version:  Tor: 0.2.9.9
     Severity:  Normal       |   Keywords:
Actual Points:               |  Parent ID:
       Points:               |   Reviewer:
      Sponsor:               |
-----------------------------+--------------------------
 I am using Tor for Onionbalance.  Uploading descriptors for a large
 OnionBalance config, I crashed Tor with this message:

 {{{
 ...
 Feb 28 09:59:44.000 [info] connection_free_(): Freeing linked Directory
 connection [client reading] with 0 bytes on inbuf, 0 on outbuf.
 Feb 28 09:59:44.000 [info] circuit_finish_handshake(): Finished building
 circuit hop:
 Feb 28 09:59:44.000 [info] internal circ (length 4, last hop kouettland):
 $566D30FF44DFBB163F632C439A86CC5B1431EC7C(open)
 $254EB51B0B85B2FB8A70997875DA493420A30458(open)
 $9844B981A80B3E4B50897098E2D65167E6AEF127(open)
 $B9FB493DC3CAC92A1F923DC05A251DCF3F4A4410(open)
 Feb 28 09:59:44.000 [info] circuit_send_next_onion_skin(): circuit built!
 Feb 28 09:59:44.000 [info] pathbias_count_build_success(): Got success
 count 273.152447/280.411541 for guard Unnamed
 ($566D30FF44DFBB163F632C439A86CC5B1431EC7C)
 Feb 28 09:59:44.000 [info] internal circ (length 4):
 $566D30FF44DFBB163F632C439A86CC5B1431EC7C(open)
 $254EB51B0B85B2FB8A70997875DA493420A30458(open)
 $9844B981A80B3E4B50897098E2D65167E6AEF127(open)
 $B9FB493DC3CAC92A1F923DC05A251DCF3F4A4410(open)
 Feb 28 09:59:44.000 [info] link_apconn_to_circ(): Looks like completed
 circuit to [scrubbed] does allow optimistic data for connection to
 [scrubbed]
 Feb 28 09:59:44.000 [info] connection_ap_handshake_send_begin(): Sending
 relay cell 1 on circ 3620016270 to begin stream 11043.
 Feb 28 09:59:44.000 [err] tor_assertion_failed_(): Bug:
 src/or/connection_edge.c:2443: connection_ap_handshake_send_begin:
 Assertion linked_dir_conn_base failed; aborting. (on Tor 0.2.9.9
 56788a2489127072)
 Feb 28 09:59:44.000 [err] Bug: Assertion linked_dir_conn_base failed in
 connection_ap_handshake_send_begin at src/or/connection_edge.c:2443. Stack
 trace: (on Tor 0.2.9.9 56788a2489127072)
 Feb 28 09:59:44.000 [err] Bug:     tor(log_backtrace+0x4c) [0x54c0ea48]
 (on Tor 0.2.9.9 56788a2489127072)
 Feb 28 09:59:44.000 [err] Bug:     tor(tor_assertion_failed_+0x90)
 [0x54c2a0f0] (on Tor 0.2.9.9 56788a2489127072)
 Feb 28 09:59:44.000 [err] Bug:
 tor(connection_ap_handshake_send_begin+0x574) [0x54bbce5c] (on Tor 0.2.9.9
 56788a2489127072)
 Feb 28 09:59:44.000 [err] Bug:
 tor(connection_ap_handshake_attach_chosen_circuit+0xf4) [0x54b94438] (on
 Tor 0.2.9.9 56788a2489127072)
 Feb 28 09:59:44.000 [err] Bug:
 tor(connection_ap_handshake_attach_circuit+0x2ec) [0x54b96ed4] (on Tor
 0.2.9.9 56788a2489127072)
 Feb 28 09:59:44.000 [err] Bug:     tor(connection_ap_attach_pending+0x198)
 [0x54bbc02c] (on Tor 0.2.9.9 56788a2489127072)
 Feb 28 09:59:44.000 [err] Bug:     tor(circuit_try_attaching_streams+0x2c)
 [0x54b93c04] (on Tor 0.2.9.9 56788a2489127072)
 Feb 28 09:59:44.000 [err] Bug:     tor(circuit_send_next_onion_skin+0x2c8)
 [0x54b7fe70] (on Tor 0.2.9.9 56788a2489127072)
 Feb 28 09:59:44.000 [err] Bug:     tor(+0x5c470) [0x54b19470] (on Tor
 0.2.9.9 56788a2489127072)
 Feb 28 09:59:44.000 [err] Bug:     tor(circuit_receive_relay_cell+0x2c8)
 [0x54b1b8e8] (on Tor 0.2.9.9 56788a2489127072)
 Feb 28 09:59:44.000 [err] Bug:     tor(command_process_cell+0x324)
 [0x54b984a8] (on Tor 0.2.9.9 56788a2489127072)
 Feb 28 09:59:44.000 [err] Bug:     tor(channel_tls_handle_cell+0x238)
 [0x54b774d8] (on Tor 0.2.9.9 56788a2489127072)
 Feb 28 09:59:44.000 [err] Bug:     tor(+0x104ad0) [0x54bc1ad0] (on Tor
 0.2.9.9 56788a2489127072)
 Feb 28 09:59:44.000 [err] Bug:     tor(+0xfb40c) [0x54bb840c] (on Tor
 0.2.9.9 56788a2489127072)
 Feb 28 09:59:44.000 [err] Bug:     tor(+0x3293c) [0x54aef93c] (on Tor
 0.2.9.9 56788a2489127072)
 }}}

 OnionBalance and other log/config files available as desired.  Config file
 as follows:

 {{{
 DataDirectory /home/pi/eotk/onionbalance.d
 ControlPort unix:/home/pi/eotk/onionbalance.d/tor-control.sock
 PidFile /home/pi/eotk/onionbalance.d/tor.pid
 Log info file /home/pi/eotk/onionbalance.d/tor.log
 SafeLogging 1
 HeartbeatPeriod 60 minutes
 RunAsDaemon 1
 # onionbalance
 SocksPort 127.0.0.1:9055
 CookieAuthentication 1
 MaxClientCircuitsPending 1024
 }}}

 - alec

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/21576>
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