#25691: Bridges don't work: Non-fatal assertion !(exit_ei == NULL) failed in
onion_pick_cpath_exit
------------------------------------+------------------------------------
 Reporter:  teor                    |          Owner:  (none)
     Type:  defect                  |         Status:  new
 Priority:  High                    |      Milestone:  Tor: 0.3.4.x-final
Component:  Core Tor/Tor            |        Version:
 Severity:  Normal                  |     Resolution:
 Keywords:  regression, 0.3.4-must  |  Actual Points:
Parent ID:                          |         Points:  0.5
 Reviewer:                          |        Sponsor:
------------------------------------+------------------------------------

Comment (by cypherpunks):

 I've seen this one.

 {{{
 [WARN] Bug:     /usr/bin/tor(_start+0x2a) [0x55a3a8ce609a] (on Tor
 0.3.3.4-alpha )
 [WARN] Bug:     /lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xf1)
 [0x7f558cd8c2b1] (on Tor 0.3.3.4-alpha )
 [WARN] Bug:     /usr/bin/tor(main+0x19) [0x55a3a8ce6049] (on Tor
 0.3.3.4-alpha )
 [WARN] Bug:     /usr/bin/tor(tor_main+0x3a) [0x55a3a8ce62da] (on Tor
 0.3.3.4-alpha )
 [WARN] Bug:     /usr/bin/tor(tor_run_main+0x275) [0x55a3a8cece95] (on Tor
 0.3.3.4-alpha )
 [WARN] Bug:     /usr/bin/tor(do_main_loop+0x2bc) [0x55a3a8ceb78c] (on Tor
 0.3.3.4-alpha )
 [WARN] Bug:     /usr/lib/x86_64-linux-
 gnu/libevent-2.0.so.5(event_base_loop+0x6a0) [0x7f558e7b85a0] (on Tor
 0.3.3.4-alpha )
 [WARN] Bug:     /usr/bin/tor(+0x53c78) [0x55a3a8ceac78] (on Tor
 0.3.3.4-alpha )
 [WARN] Bug:     /usr/bin/tor(circuit_build_needed_circs+0x3c8)
 [0x55a3a8d83e28] (on Tor 0.3.3.4-alpha )
 [WARN] Bug:     /usr/bin/tor(circuit_launch_by_extend_info+0x7d)
 [0x55a3a8d8369d] (on Tor 0.3.3.4-alpha )
 [WARN] Bug:     /usr/bin/tor(circuit_establish_circuit+0xa22)
 [0x55a3a8d70832] (on Tor 0.3.3.4-alpha )
 [WARN] Bug:     /usr/bin/tor(tor_bug_occurred_+0xb9) [0x55a3a8e3b989] (on
 Tor 0.3.3.4-alpha )
 [WARN] Bug:     /usr/bin/tor(log_backtrace+0x44) [0x55a3a8e20154] (on Tor
 0.3.3.4-alpha )
 [WARN] Bug: Non-fatal assertion !(exit_ei == NULL) failed in
 onion_pick_cpath_exit at ../src/or/circuitbuild.c:2390. Stack trace: (on
 Tor 0.3.3.4-alpha )
 [WARN] tor_bug_occurred_(): Bug: ../src/or/circuitbuild.c:2390:
 onion_pick_cpath_exit: Non-fatal assertion !(exit_ei == NULL) failed. (on
 Tor 0.3.3.4-alpha )
 }}}

 It seems to be reproducible when your client has a newer consensus and the
 bridge lacks the descriptor to extend the circuit.

--
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/25691#comment:3>
Tor Bug Tracker & Wiki <https://trac.torproject.org/>
The Tor Project: anonymity online
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