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Hi everybody

The following bug appeared: connection_check_event: Bug: Event missing on connection

It's before hand a #23751 (moved) bug which is re-opened for it.

Tor 0.3.2.3-alpha (git-023d756bfc04c244) running on FreeBSD with Libevent 2.1.8-stable, OpenSSL LibreSSL 2.5.4, Zlib 1.2.8, Liblzma 5.2.2, and Libzstd 1.3.2.

Tor memory is about 5 GB according to:

MaxMemInQueues 5 GB

Nov 06 20:45:27.000 [notice] Heartbeat: Tor's uptime is 9 days 2:59 hours, with 89916 circuits open. I've sent 6246.15 GB and received 6171.99 GB.
Nov 06 20:45:27.000 [notice] Circuit handshake stats since last time: 31997/31997 TAP, 402465/402465 NTor.
Nov 06 20:45:27.000 [notice] Since startup, we have initiated 0 v1 connections, 0 v2 connections, 3 v3 connections, and 297718 v4 connections; and received 2284 v1 connections, 47407 v2 connections, 113778 v3 connections, and 907883 v4 connections.
Nov 06 21:45:27.000 [notice] Heartbeat: Tor's uptime is 9 days 3:59 hours, with 156766 circuits open. I've sent 6284.75 GB and received 6211.71 GB.
Nov 06 21:45:27.000 [notice] Circuit handshake stats since last time: 34286/34286 TAP, 399076/399076 NTor.
Nov 06 21:45:27.000 [notice] Since startup, we have initiated 0 v1 connections, 0 v2 connections, 3 v3 connections, and 298544 v4 connections; and received 2290 v1 connections, 47654 v2 connections, 114327 v3 connections, and 911591 v4 connections.
Nov 06 22:32:42.000 [warn] connection_check_event: Bug: Event missing on connection 0x80f227b00 [OR;open]. socket=-1. linked=0. is_dns_request=0. Marked_for_close=src/or/connection.c:3894 (on Tor 0.3.2.3-alpha 023d756bfc04c244)
Nov 06 22:32:42.000 [warn] Bug: Backtrace attached.. Stack trace: (on Tor 0.3.2.3-alpha 023d756bfc04c244)
Nov 06 22:32:42.000 [warn] Bug:     0x11a2cd8 <log_backtrace+0x48> at /usr/local/bin/tor (on Tor 0.3.2.3-alpha 023d756bfc04c244)
Nov 06 22:32:42.000 [warn] Bug:     0x1071f21 <connection_is_reading+0x1c1> at /usr/local/bin/tor (on Tor 0.3.2.3-alpha 023d756bfc04c244)
Nov 06 22:32:42.000 [warn] Bug:     0x1071870 <connection_start_reading+0x30> at /usr/local/bin/tor (on Tor 0.3.2.3-alpha 023d756bfc04c244)
Nov 06 22:32:42.000 [warn] Bug:     0x1127408 <connection_bucket_refill+0x9a8> at /usr/local/bin/tor (on Tor 0.3.2.3-alpha 023d756bfc04c244)
Nov 06 22:32:42.000 [warn] Bug:     0x1073c8d <handle_signals+0xc2d> at /usr/local/bin/tor (on Tor 0.3.2.3-alpha 023d756bfc04c244)
Nov 06 22:32:42.000 [warn] Bug:     0x801b38d3e <event_base_assert_ok_nolock_+0xbce> at /usr/local/lib/libevent-2.1.so.6 (on Tor 0.3.2.3-alpha 023d756bfc04c244)
Nov 06 22:32:42.000 [warn] Bug:     0x801b34cfe <event_base_loop+0x50e> at /usr/local/lib/libevent-2.1.so.6 (on Tor 0.3.2.3-alpha 023d756bfc04c244)
Nov 06 22:32:42.000 [warn] Bug:     0x1072eb5 <do_main_loop+0x575> at /usr/local/bin/tor (on Tor 0.3.2.3-alpha 023d756bfc04c244)
Nov 06 22:32:42.000 [warn] Bug:     0x10752a9 <tor_main+0xe9> at /usr/local/bin/tor (on Tor 0.3.2.3-alpha 023d756bfc04c244)
Nov 06 22:32:42.000 [warn] Bug:     0x1070d09 <main+0x19> at /usr/local/bin/tor (on Tor 0.3.2.3-alpha 023d756bfc04c244)
Nov 06 22:32:42.000 [warn] Bug:     0x1070c01 <_start+0x1a1> at /usr/local/bin/tor (on Tor 0.3.2.3-alpha 023d756bfc04c244)
Nov 06 22:45:27.000 [notice] Heartbeat: Tor's uptime is 9 days 4:59 hours, with 221777 circuits open. I've sent 6323.37 GB and received 6252.10 GB.
Nov 06 22:45:27.000 [notice] Circuit handshake stats since last time: 97470/97470 TAP, 379601/379601 NTor.
Nov 06 22:45:27.000 [notice] Since startup, we have initiated 0 v1 connections, 0 v2 connections, 3 v3 connections, and 299180 v4 connections; and received 2303 v1 connections, 47866 v2 connections, 114911 v3 connections, and 915142 v4 connections.
Nov 06 23:45:27.000 [notice] Heartbeat: Tor's uptime is 9 days 6:00 hours, with 87446 circuits open. I've sent 6350.85 GB and received 6278.68 GB.
Nov 06 23:45:27.000 [notice] Circuit handshake stats since last time: 21046/21046 TAP, 409042/409042 NTor.
Nov 06 23:45:27.000 [notice] Since startup, we have initiated 0 v1 connections, 0 v2 connections, 3 v3 connections, and 300082 v4 connections; and received 2314 v1 connections, 48042 v2 connections, 115432 v3 connections, and 918682 v4 connections.
Nov 07 00:45:27.000 [notice] Heartbeat: Tor's uptime is 9 days 6:59 hours, with 298896 circuits open. I've sent 6373.37 GB and received 6302.57 GB.
Nov 07 00:45:27.000 [notice] Circuit handshake stats since last time: 206885/206885 TAP, 394540/394540 NTor.
Nov 07 00:45:27.000 [notice] Since startup, we have initiated 0 v1 connections, 0 v2 connections, 3 v3 connections, and 300924 v4 connections; and received 2326 v1 connections, 48242 v2 connections, 115999 v3 connections, and 922124 v4 connections.
Nov 07 01:25:47.000 [warn] connection_check_event: Bug: Event missing on connection 0x80fac4980 [OR;open]. socket=-1. linked=0. is_dns_request=0. Marked_for_close=src/or/connection.c:3894 (on Tor 0.3.2.3-alpha 023d756bfc04c244)
Nov 07 01:25:47.000 [warn] Bug: Backtrace attached.. Stack trace: (on Tor 0.3.2.3-alpha 023d756bfc04c244)
Nov 07 01:25:47.000 [warn] Bug:     0x11a2cd8 <log_backtrace+0x48> at /usr/local/bin/tor (on Tor 0.3.2.3-alpha 023d756bfc04c244)
Nov 07 01:25:47.000 [warn] Bug:     0x1071f21 <connection_is_reading+0x1c1> at /usr/local/bin/tor (on Tor 0.3.2.3-alpha 023d756bfc04c244)
Nov 07 01:25:47.000 [warn] Bug:     0x1071870 <connection_start_reading+0x30> at /usr/local/bin/tor (on Tor 0.3.2.3-alpha 023d756bfc04c244)
Nov 07 01:25:47.000 [warn] Bug:     0x1127408 <connection_bucket_refill+0x9a8> at /usr/local/bin/tor (on Tor 0.3.2.3-alpha 023d756bfc04c244)
Nov 07 01:25:47.000 [warn] Bug:     0x1073c8d <handle_signals+0xc2d> at /usr/local/bin/tor (on Tor 0.3.2.3-alpha 023d756bfc04c244)
Nov 07 01:25:47.000 [warn] Bug:     0x801b38d3e <event_base_assert_ok_nolock_+0xbce> at /usr/local/lib/libevent-2.1.so.6 (on Tor 0.3.2.3-alpha 023d756bfc04c244)
Nov 07 01:25:47.000 [warn] Bug:     0x801b34cfe <event_base_loop+0x50e> at /usr/local/lib/libevent-2.1.so.6 (on Tor 0.3.2.3-alpha 023d756bfc04c244)
Nov 07 01:25:47.000 [warn] Bug:     0x1072eb5 <do_main_loop+0x575> at /usr/local/bin/tor (on Tor 0.3.2.3-alpha 023d756bfc04c244)
Nov 07 01:25:47.000 [warn] Bug:     0x10752a9 <tor_main+0xe9> at /usr/local/bin/tor (on Tor 0.3.2.3-alpha 023d756bfc04c244)
Nov 07 01:25:47.000 [warn] Bug:     0x1070d09 <main+0x19> at /usr/local/bin/tor (on Tor 0.3.2.3-alpha 023d756bfc04c244)
Nov 07 01:25:47.000 [warn] Bug:     0x1070c01 <_start+0x1a1> at /usr/local/bin/tor (on Tor 0.3.2.3-alpha 023d756bfc04c244)
Nov 07 01:27:51.000 [notice] We're low on memory.  Killing circuits with over-long queues. (This behavior is controlled by MaxMemInQueues.)
Nov 07 01:27:52.000 [notice] Removed 824368 bytes by killing 519528 circuits; 0 circuits remain alive. Also killed 0 non-linked directory connections.
Nov 07 01:27:55.000 [notice] We're low on memory.  Killing circuits with over-long queues. (This behavior is controlled by MaxMemInQueues.)
Nov 07 01:27:55.000 [notice] Removed 528 bytes by killing 163 circuits; 0 circuits remain alive. Also killed 0 non-linked directory connections.
Nov 07 01:27:55.000 [notice] We're low on memory.  Killing circuits with over-long queues. (This behavior is controlled by MaxMemInQueues.)
Nov 07 01:27:55.000 [notice] Removed 528 bytes by killing 170 circuits; 0 circuits remain alive. Also killed 0 non-linked directory connections.
Nov 07 01:27:55.000 [notice] We're low on memory.  Killing circuits with over-long queues. (This behavior is controlled by MaxMemInQueues.)
Nov 07 01:27:55.000 [notice] Removed 528 bytes by killing 455 circuits; 0 circuits remain alive. Also killed 0 non-linked directory connections. 

Cheers !

Trac:
Username: Felixix