[tor-bugs] #24502 [Core Tor/Tor]: scheduler_release_channel: Non-fatal assertion

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#24502: scheduler_release_channel: Non-fatal assertion
-----------------------------------+------------------------------------
 Reporter:  toralf                 |          Owner:  dgoulet
     Type:  defect                 |         Status:  needs_review
 Priority:  Low                    |      Milestone:  Tor: 0.3.2.x-final
Component:  Core Tor/Tor           |        Version:  Tor: 0.3.2.6-alpha
 Severity:  Normal                 |     Resolution:
 Keywords:  tor-sched, regression  |  Actual Points:
Parent ID:                         |         Points:
 Reviewer:  pastly                 |        Sponsor:
-----------------------------------+------------------------------------

Comment (by toralf):

 Another example from today:
 {{{
 Dec 04 21:03:05.000 [warn] tor_bug_occurred_(): Bug:
 src/or/scheduler.c:631: scheduler_release_channel: Non-fatal assertion
 !(smartlist_pos(channels_pending, chan) =
 = -1) failed. (on Tor 0.3.2.6-alpha 87012d076ef58bb9)
 Dec 04 21:03:05.000 [warn] Bug: Non-fatal assertion
 !(smartlist_pos(channels_pending, chan) == -1) failed in
 scheduler_release_channel at src/or/scheduler.c:631. Sta
 ck trace: (on Tor 0.3.2.6-alpha 87012d076ef58bb9)
 Dec 04 21:03:05.000 [warn] Bug:     /usr/bin/tor(log_backtrace+0x53)
 [0x55ad3ea64e73] (on Tor 0.3.2.6-alpha 87012d076ef58bb9)
 Dec 04 21:03:05.000 [warn] Bug:     /usr/bin/tor(tor_bug_occurred_+0xc5)
 [0x55ad3ea81b75] (on Tor 0.3.2.6-alpha 87012d076ef58bb9)
 Dec 04 21:03:05.000 [warn] Bug:
 /usr/bin/tor(scheduler_release_channel+0x19a) [0x55ad3e99312a] (on Tor
 0.3.2.6-alpha 87012d076ef58bb9)
 Dec 04 21:03:05.000 [warn] Bug:     /usr/bin/tor(+0xc7408)
 [0x55ad3e99f408] (on Tor 0.3.2.6-alpha 87012d076ef58bb9)
 Dec 04 21:03:05.000 [warn] Bug:
 /usr/bin/tor(connection_or_about_to_close+0x4d) [0x55ad3e9f43dd] (on Tor
 0.3.2.6-alpha 87012d076ef58bb9)
 Dec 04 21:03:05.000 [warn] Bug:     /usr/bin/tor(+0x4ff8c)
 [0x55ad3e927f8c] (on Tor 0.3.2.6-alpha 87012d076ef58bb9)
 Dec 04 21:03:05.000 [warn] Bug:     /usr/bin/tor(+0x50788)
 [0x55ad3e928788] (on Tor 0.3.2.6-alpha 87012d076ef58bb9)
 Dec 04 21:03:05.000 [warn] Bug:     /usr/lib64/libevent-2.1.so.6(+0x2373a)
 [0x7ff15d09073a] (on Tor 0.3.2.6-alpha 87012d076ef58bb9)
 Dec 04 21:03:05.000 [warn] Bug:
 /usr/lib64/libevent-2.1.so.6(event_base_loop+0x57f) [0x7ff15d09168f] (on
 Tor 0.3.2.6-alpha 87012d076ef58bb9)
 Dec 04 21:03:05.000 [warn] Bug:     /usr/bin/tor(do_main_loop+0x24d)
 [0x55ad3e929f3d] (on Tor 0.3.2.6-alpha 87012d076ef58bb9)
 Dec 04 21:03:05.000 [warn] Bug:     /usr/bin/tor(tor_main+0x1c2d)
 [0x55ad3e92d9bd] (on Tor 0.3.2.6-alpha 87012d076ef58bb9)
 Dec 04 21:03:05.000 [warn] Bug:     /usr/bin/tor(main+0x28)
 [0x55ad3e9252b8] (on Tor 0.3.2.6-alpha 87012d076ef58bb9)
 Dec 04 21:03:05.000 [warn] Bug:
 /lib64/libc.so.6(__libc_start_main+0xfd) [0x7ff15bc055ad] (on Tor
 0.3.2.6-al
 pha 87012d076ef58bb9)
 Dec 04 21:03:05.000 [warn] Bug:     /usr/bin/tor(_start+0x2a)
 [0x55ad3e92530a] (on Tor 0.3.2.6-alpha 87012d076ef58bb9)
 Dec 04 21:03:05.000 [warn] scheduler_bug_occurred(): Bug: Channel 1204645
 in state channel error and scheduler state 3. Num cells on cmux: 3.
 Connection outbuf len: 0. Num pending channels: 98. Channel in pending
 list: no. (on Tor 0.3.2.6-alpha 87012d076ef58bb9)
 Dec 04 21:03:05.000 [warn] Scheduler asked to release channel 1204645 but
 it wasn't in channels_pending
 }}}

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/24502#comment:8>
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