connection_dir_finished_flushing(): Bug: called in unexpected state 3
This from tor version git-302908657f492f06 on one of my test relay. It was immediately followed by another BUG() below. Note that relay is still running and seems well.
Torrc has nothing special except:
BandwidthRate 400 KBytes
Stacktrace:
Apr 29 13:30:59.691 [warn] connection_dir_finished_flushing(): Bug: called in unexpected state 3. (on Tor 0.3.4.0-alpha-dev 302908657f492f06)
Apr 29 13:30:59.691 [warn] tor_bug_occurred_(): Bug: src/or/directory.c:5248: connection_dir_finished_flushing: This line should not have been reached. (Future instances of this warning will be silenced.) (on Tor 0.3.4.0-alpha-dev 302908657f492f06)
Apr 29 13:30:59.731 [warn] Bug: Line unexpectedly reached at connection_dir_finished_flushing at src/or/directory.c:5248. Stack trace: (on Tor 0.3.4.0-alpha-dev 302908657f492f06)
Apr 29 13:30:59.731 [warn] Bug: /home/relay/tor/src/or/tor(log_backtrace+0x42) [0x55811a451722] (on Tor 0.3.4.0-alpha-dev 302908657f492f06)
Apr 29 13:30:59.731 [warn] Bug: /home/relay/tor/src/or/tor(tor_bug_occurred_+0xb9) [0x55811a46c559] (on Tor 0.3.4.0-alpha-dev 302908657f492f06)
Apr 29 13:30:59.731 [warn] Bug: /home/relay/tor/src/or/tor(connection_dir_finished_flushing+0x12e) [0x55811a3fc6ee] (on Tor 0.3.4.0-alpha-dev 302908657f492f06)
Apr 29 13:30:59.731 [warn] Bug: /home/relay/tor/src/or/tor(+0x108fcd) [0x55811a3d5fcd] (on Tor 0.3.4.0-alpha-dev 302908657f492f06)
Apr 29 13:30:59.731 [warn] Bug: /home/relay/tor/src/or/tor(connection_handle_write+0x2e) [0x55811a3d67ae] (on Tor 0.3.4.0-alpha-dev 302908657f492f06)
Apr 29 13:30:59.731 [warn] Bug: /home/relay/tor/src/or/tor(+0x534be) [0x55811a3204be] (on Tor 0.3.4.0-alpha-dev 302908657f492f06)
Apr 29 13:30:59.731 [warn] Bug: /usr/lib/x86_64-linux-gnu/libevent-2.0.so.5(event_base_loop+0x819) [0x7f0f91d364c9] (on Tor 0.3.4.0-alpha-dev 302908657f492f06)
Apr 29 13:30:59.731 [warn] Bug: /home/relay/tor/src/or/tor(do_main_loop+0x1a5) [0x55811a3217d5] (on Tor 0.3.4.0-alpha-dev 302908657f492f06)
Apr 29 13:30:59.731 [warn] Bug: /home/relay/tor/src/or/tor(tor_run_main+0x275) [0x55811a322ed5] (on Tor 0.3.4.0-alpha-dev 302908657f492f06)
Apr 29 13:30:59.731 [warn] Bug: /home/relay/tor/src/or/tor(tor_main+0x3a) [0x55811a31c40a] (on Tor 0.3.4.0-alpha-dev 302908657f492f06)
Apr 29 13:30:59.731 [warn] Bug: /home/relay/tor/src/or/tor(main+0x19) [0x55811a31c179] (on Tor 0.3.4.0-alpha-dev 302908657f492f06)
Apr 29 13:30:59.731 [warn] Bug: /lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xf0) [0x7f0f90a48830] (on Tor 0.3.4.0-alpha-dev 302908657f492f06)
Apr 29 13:30:59.731 [warn] Bug: /home/relay/tor/src/or/tor(_start+0x29) [0x55811a31c1c9] (on Tor 0.3.4.0-alpha-dev 302908657f492f06)
Apr 29 13:30:59.731 [warn] conn_write_callback(): Bug: unhandled error on write for Directory connection (fd 1588); removing (on Tor 0.3.4.0-alpha-dev 302908657f492f06)
Apr 29 13:30:59.731 [warn] tor_bug_occurred_(): Bug: src/or/main.c:935: conn_write_callback: This line should not have been reached. (Future instances of this warning will be silenced.) (on Tor 0.3.4.0-alpha-dev 302908657f492f06)
Apr 29 13:30:59.731 [warn] Bug: Line unexpectedly reached at conn_write_callback at src/or/main.c:935. Stack trace: (on Tor 0.3.4.0-alpha-dev 302908657f492f06)
Apr 29 13:30:59.731 [warn] Bug: /home/relay/tor/src/or/tor(log_backtrace+0x42) [0x55811a451722] (on Tor 0.3.4.0-alpha-dev 302908657f492f06)
Apr 29 13:30:59.731 [warn] Bug: /home/relay/tor/src/or/tor(tor_bug_occurred_+0xb9) [0x55811a46c559] (on Tor 0.3.4.0-alpha-dev 302908657f492f06)
Apr 29 13:30:59.731 [warn] Bug: /home/relay/tor/src/or/tor(+0x53692) [0x55811a320692] (on Tor 0.3.4.0-alpha-dev 302908657f492f06)
Apr 29 13:30:59.731 [warn] Bug: /usr/lib/x86_64-linux-gnu/libevent-2.0.so.5(event_base_loop+0x819) [0x7f0f91d364c9] (on Tor 0.3.4.0-alpha-dev 302908657f492f06)
Apr 29 13:30:59.731 [warn] Bug: /home/relay/tor/src/or/tor(do_main_loop+0x1a5) [0x55811a3217d5] (on Tor 0.3.4.0-alpha-dev 302908657f492f06)
Apr 29 13:30:59.731 [warn] Bug: /home/relay/tor/src/or/tor(tor_run_main+0x275) [0x55811a322ed5] (on Tor 0.3.4.0-alpha-dev 302908657f492f06)
Apr 29 13:30:59.731 [warn] Bug: /home/relay/tor/src/or/tor(tor_main+0x3a) [0x55811a31c40a] (on Tor 0.3.4.0-alpha-dev 302908657f492f06)
Apr 29 13:30:59.731 [warn] Bug: /home/relay/tor/src/or/tor(main+0x19) [0x55811a31c179] (on Tor 0.3.4.0-alpha-dev 302908657f492f06)
Apr 29 13:30:59.731 [warn] Bug: /lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xf0) [0x7f0f90a48830] (on Tor 0.3.4.0-alpha-dev 302908657f492f06)
Apr 29 13:30:59.731 [warn] Bug: /home/relay/tor/src/or/tor(_start+0x29) [0x55811a31c1c9] (on Tor 0.3.4.0-alpha-dev 302908657f492f06)