#25128: Bug: src/or/dos.c:312: cc_stats_refill_bucket: Non-fatal assertion
new_circuit_bucket_count >= stats->circuit_bucket failed
------------------------------+--------------------------------
     Reporter:  dgoulet       |      Owner:  dgoulet
         Type:  defect        |     Status:  assigned
     Priority:  Very High     |  Milestone:  Tor: 0.3.3.x-final
    Component:  Core Tor/Tor  |    Version:
     Severity:  Normal        |   Keywords:  tor-sched, tor-dos
Actual Points:                |  Parent ID:
       Points:                |   Reviewer:
      Sponsor:                |
------------------------------+--------------------------------
 I changed the `DoSCircuitCreationBurst` value in my torrc and this BUG()
 was triggered:

 {{{
 Feb 02 21:52:55.902 [warn] tor_bug_occurred_(): Bug: src/or/dos.c:312:
 cc_stats_refill_bucket: Non-fatal assertion new_circuit_bucket_count >=
 stats->circuit_bucket failed. (on Tor 0.3.3.1-alpha-dev eafa252b26ecf83a)
 Feb 02 21:52:55.903 [warn] Bug: Non-fatal assertion
 new_circuit_bucket_count >= stats->circuit_bucket failed in
 cc_stats_refill_bucket at src/or/dos.c:312. Stack trace: (on Tor 0.3.3.1
 -alpha-dev eafa252b26ecf83a)
 Feb 02 21:52:55.903 [warn] Bug:
 /root/git/tor/src/or/tor(log_backtrace+0x42) [0x557248c2bbd2] (on Tor
 0.3.3.1-alpha-dev eafa252b26ecf83a)
 Feb 02 21:52:55.903 [warn] Bug:
 /root/git/tor/src/or/tor(tor_bug_occurred_+0xb9) [0x557248c46f69] (on Tor
 0.3.3.1-alpha-dev eafa252b26ecf83a)
 Feb 02 21:52:55.903 [warn] Bug:
 /root/git/tor/src/or/tor(dos_cc_new_create_cell+0x263) [0x557248bf1e63]
 (on Tor 0.3.3.1-alpha-dev eafa252b26ecf83a)
 }}}

 This is because of:

 {{{
   /* This function is not allowed to make the bucket count smaller */
   tor_assert_nonfatal(new_circuit_bucket_count >= stats->circuit_bucket);
 }}}

 We actually can make it smaller if the Burst or Rate is changed at
 runtime.

--
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/25128>
Tor Bug Tracker & Wiki <https://trac.torproject.org/>
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