This is on a very fast relay (>200 mbit/s). Started happening day before yesterday without any known changes to tor, libevent or openssl. Reproducable within hours it seems. $ uname -a Linux tor 2.6.32-38-server legacy/trac#83-Ubuntu SMP Wed Jan 4 11:26:59 UTC 2012 x86_64 GNU/Linux libevent is 2.0.19-stable. ``` Jun 01 08:49:46.000 [notice] Tor 0.2.3.15-alpha (git-2513a3e959b61612) opening log file. Jun 01 08:49:46.000 [notice] This version of OpenSSL has a known-good EVP counter-mode implementation. Using it. Jun 01 08:49:46.000 [notice] OpenSSL OpenSSL 1.0.1c 10 May 2012 looks like version 0.9.8m or later; I will try SSL_OP to enable renegotiation Jun 01 08:49:46.000 [notice] Your Tor server's identity key fingerprint is 'ndnr1 6330CCF8FEED2EF9B12FCF6688E2577C65522BA4' (gdb) bt full #0 0x00007ffff6a02acd in write () from /lib/libc.so.6 No symbol table info available. #1 0x00007ffff71a1035 in sock_write () from /home/linus/usr/lib/libcrypto.so.1.0.0 No symbol table info available. #2 0x00007ffff719f1a7 in BIO_write () from /home/linus/usr/lib/libcrypto.so.1.0.0 No symbol table info available. #3 0x00007ffff71a2389 in buffer_ctrl () from /home/linus/usr/lib/libcrypto.so.1.0.0 No symbol table info available. #4 0x00007ffff74b6307 in ssl3_accept () from /home/linus/usr/lib/libssl.so.1.0.0 No symbol table info available. #5 0x00007ffff74c2b05 in ssl23_get_client_hello () from /home/linus/usr/lib/libssl.so.1.0.0 No symbol table info available. #6 0x00007ffff74c33e5 in ssl23_accept () from /home/linus/usr/lib/libssl.so.1.0.0 No symbol table info available. #7 0x000000000052e3f9 in tor_tls_handshake (tls=0x7fffdc774b60) at tortls.c:1743 r = 0 oldstate = 24576 __PRETTY_FUNCTION__ = "tor_tls_handshake" __func__ = "tor_tls_handshake" #8 0x00000000004bd04e in connection_tls_continue_handshake (conn=0x7fffdc4507a0) at connection_or.c:1182 result = 7 __PRETTY_FUNCTION__ = "connection_tls_continue_handshake" __func__ = "connection_tls_continue_handshake" #9 0x00000000004bcf01 in connection_tls_start_handshake (conn=0x7fffdc4507a0, receiving=1) at connection_or.c:1139 __PRETTY_FUNCTION__ = "connection_tls_start_handshake" __func__ = "connection_tls_start_handshake" #10 0x00000000004a7b5b in connection_init_accepted_conn (conn=0x7fffdc4507a0, listener=0x7ac900) at connection.c:1278 No locals. #11 0x00000000004a7a7f in connection_handle_listener_read (conn=0x7ac900, new_type=4) at connection.c:1256 news = 314 newconn = 0x7fffdc4507a0 addrbuf = {ss_family = 2, __ss_align = 0, __ss_padding = '\000' <repeats 111 times>} remote = 0x7fffffffddd0 remotelen = 16 options = 0x7a9c80 __PRETTY_FUNCTION__ = "connection_handle_listener_read" __func__ = "connection_handle_listener_read" #12 0x00000000004aad5e in connection_handle_read_impl (conn=0x7ac900) at connection.c:2627 max_to_read = -1 try_to_read = 140737354119250 before = 140737488346864 n_read = 0 socket_error = 0 __PRETTY_FUNCTION__ = "connection_handle_read_impl" __func__ = "connection_handle_read_impl" #13 0x00000000004ab14e in connection_handle_read (conn=0x7ac900) at connection.c:2721 res = 32767 #14 0x000000000040a578 in conn_read_callback (fd=8, event=2, _conn=0x7ac900) at main.c:702 conn = 0x7ac900 __PRETTY_FUNCTION__ = "conn_read_callback" #15 0x00007ffff771010c in event_process_active_single_queue (base=0x7ac110, flags=<value optimized out>) at event.c:1346 ev = 0x7ac9d0 #16 event_process_active (base=0x7ac110, flags=<value optimized out>) at event.c:1416 activeq = 0x7ab9b0 i = 0 #17 event_base_loop (base=0x7ac110, flags=<value optimized out>) at event.c:1617 n = 1 evsel = 0x7ffff7940d80 tv = {tv_sec = 0, tv_usec = 53123} tv_p = <value optimized out> res = <value optimized out> retval = <value optimized out> __func__ = "event_base_loop" #18 0x000000000040cf32 in do_main_loop () at main.c:1924 loop_result = 0 now = 1338533388 __PRETTY_FUNCTION__ = "do_main_loop" __func__ = "do_main_loop" #19 0x000000000040e4a7 in tor_main (argc=3, argv=0x7fffffffe1f8) at main.c:2619 result = 0 __PRETTY_FUNCTION__ = "tor_main" #20 0x0000000000408b34 in main (argc=3, argv=0x7fffffffe1f8) at tor_main.c:30 No locals. ```