[tor-bugs] #25981 [Core Tor/Tor]: Conflicting ports cause tor to crash

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#25981: Conflicting ports cause tor to crash
------------------------------+--------------------
     Reporter:  atagar        |      Owner:  (none)
         Type:  defect        |     Status:  new
     Priority:  Very High     |  Milestone:
    Component:  Core Tor/Tor  |    Version:
     Severity:  Major         |   Keywords:
Actual Points:                |  Parent ID:
       Points:                |   Reviewer:
      Sponsor:                |
------------------------------+--------------------
 Hi Nick, here's the bug I've been nagging about on irc the last few days.
 :P

 Recent regression is causing stem's integ tests to fail. This should be
 easily reproducible with tor's stem integ target (maybe we could run that
 prior to pushes?).

 Here's a standalone repro...

 {{{
 atagar at morrigan:~/Desktop/stem$ cat ~/bad_torrc
 SocksPort 1234
 ControlPort 1234

 atagar at morrigan:~/Desktop/stem$ tor -f ~/bad_torrc
 Apr 30 11:43:32.107 [notice] Tor 0.3.4.0-alpha-dev (git-d1a0534649be02e3)
 running on Linux with Libevent 2.0.21-stable, OpenSSL 1.0.2g, Zlib 1.2.8,
 Liblzma N/A, and Libzstd N/A.
 Apr 30 11:43:32.107 [notice] Tor can't help you if you use it wrong! Learn
 how to be safe at https://www.torproject.org/download/download#warning
 Apr 30 11:43:32.107 [notice] This version is not a stable Tor release.
 Expect more bugs than usual.
 Apr 30 11:43:32.107 [notice] Read configuration file
 "/home/atagar/bad_torrc".
 Apr 30 11:43:32.110 [warn] ControlPort is open, but no authentication
 method has been configured.  This means that any program on your computer
 can reconfigure your Tor.  That's bad!  You should upgrade your Tor
 controller as soon as possible.
 Apr 30 11:43:32.110 [notice] Scheduler type KIST has been enabled.
 Apr 30 11:43:32.110 [notice] Opening Socks listener on 127.0.0.1:1234
 Apr 30 11:43:32.110 [notice] Opening Control listener on 127.0.0.1:1234
 Apr 30 11:43:32.110 [warn] Could not bind to 127.0.0.1:1234: Address
 already in use. Is Tor already running?
 Apr 30 11:43:32.110 [notice] Closing partially-constructed Socks listener
 on 127.0.0.1:1234
 Apr 30 11:43:32.110 [err] tor_assertion_failed_(): Bug:
 src/common/compat_libevent.c:388: mainloop_event_activate: Assertion event
 failed; aborting. (on Tor 0.3.4.0-alpha-dev d1a0534649be02e3)
 Apr 30 11:43:32.111 [err] Bug: Assertion event failed in
 mainloop_event_activate at src/common/compat_libevent.c:388. Stack trace:
 (on Tor 0.3.4.0-alpha-dev d1a0534649be02e3)
 Apr 30 11:43:32.111 [err] Bug:     tor(log_backtrace+0x42)
 [0x55d0990d98b2] (on Tor 0.3.4.0-alpha-dev d1a0534649be02e3)
 Apr 30 11:43:32.111 [err] Bug:     tor(tor_assertion_failed_+0x8d)
 [0x55d0990f440d] (on Tor 0.3.4.0-alpha-dev d1a0534649be02e3)
 Apr 30 11:43:32.111 [err] Bug:     tor(mainloop_event_activate+0x5f)
 [0x55d09913857f] (on Tor 0.3.4.0-alpha-dev d1a0534649be02e3)
 Apr 30 11:43:32.111 [err] Bug:
 tor(connection_mark_for_close_internal_+0x6c) [0x55d0990590fc] (on Tor
 0.3.4.0-alpha-dev d1a0534649be02e3)
 Apr 30 11:43:32.111 [err] Bug:     tor(set_options+0x1b3) [0x55d09904d573]
 (on Tor 0.3.4.0-alpha-dev d1a0534649be02e3)
 Apr 30 11:43:32.111 [err] Bug:     tor(options_init_from_string+0x37e)
 [0x55d09904febe] (on Tor 0.3.4.0-alpha-dev d1a0534649be02e3)
 Apr 30 11:43:32.111 [err] Bug:     tor(options_init_from_torrc+0x433)
 [0x55d099050513] (on Tor 0.3.4.0-alpha-dev d1a0534649be02e3)
 Apr 30 11:43:32.111 [err] Bug:     tor(tor_init+0x2f0) [0x55d098faa620]
 (on Tor 0.3.4.0-alpha-dev d1a0534649be02e3)
 Apr 30 11:43:32.111 [err] Bug:     tor(tor_run_main+0x65) [0x55d098fab0c5]
 (on Tor 0.3.4.0-alpha-dev d1a0534649be02e3)
 Apr 30 11:43:32.111 [err] Bug:     tor(tor_main+0x3a) [0x55d098fa47da] (on
 Tor 0.3.4.0-alpha-dev d1a0534649be02e3)
 Apr 30 11:43:32.111 [err] Bug:     tor(main+0x19) [0x55d098fa4549] (on Tor
 0.3.4.0-alpha-dev d1a0534649be02e3)
 Apr 30 11:43:32.111 [err] Bug:     /lib/x86_64-linux-
 gnu/libc.so.6(__libc_start_main+0xf0) [0x7f7a12ab4830] (on Tor 0.3.4.0
 -alpha-dev d1a0534649be02e3)
 Apr 30 11:43:32.111 [err] Bug:     tor(_start+0x29) [0x55d098fa4599] (on
 Tor 0.3.4.0-alpha-dev d1a0534649be02e3)
 Aborted (core dumped)
 }}}

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/25981>
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