Created attachment 50362 [details]
Valgrind log

Backtrace:
#0 0x00007ffff56dc7f0 in ?? () from /lib/libc.so.6
#1 0x00007ffff56d6735 in memmove () from /lib/libc.so.6
#2 0x00007ffff5a17999 in g_memdup () from /usr/lib/libglib-2.0.so.0
#3 0x00000000004e3899 in wocky_tls_session_push_func (user_data=0x7e01a0, buffer=0x8921b0, count=4294967269) at wocky-tls.c:1192
#4 0x00007ffff6e800c5 in _gnutls_writev_emu (session=0x88f9d0, fd=0x7e01a0, giovec=0x7fffffffd710, giovec_cnt=3) at gnutls_buffers.c:322
#5 0x00007ffff6e8016e in _gnutls_writev (session=0x88f9d0, giovec=0x7fffffffd710, giovec_cnt=3) at gnutls_buffers.c:349
#6 0x00007ffff6e808de in _gnutls_io_write_flush (session=0x88f9d0) at gnutls_buffers.c:564
#7 0x00007ffff6e80e02 in _gnutls_handshake_io_write_flush (session=0x88f9d0) at gnutls_buffers.c:679
#8 0x00007ffff6e85947 in _gnutls_send_handshake (session=0x88f9d0, bufel=0xb40440, type=GNUTLS_HANDSHAKE_FINISHED) at gnutls_handshake.c:1133
#9 0x00007ffff6e84916 in _gnutls_send_finished (session=0x88f9d0, again=0) at gnutls_handshake.c:667
#10 0x00007ffff6e8925b in _gnutls_send_handshake_final (session=0x88f9d0, init=1) at gnutls_handshake.c:2600
#11 0x00007ffff6e89f02 in _gnutls_handshake_common (session=0x88f9d0) at gnutls_handshake.c:2822
#12 0x00007ffff6e885e4 in gnutls_handshake (session=0x88f9d0) at gnutls_handshake.c:2342
#13 0x00000000004e1a3e in wocky_tls_session_try_operation (session=0x7e01a0, operation=WOCKY_TLS_OP_READ) at wocky-tls.c:386
#14 0x00000000004e35a9 in wocky_tls_session_read_ready (object=0x818c90, result=0x85c920, user_data=0x7e01a0) at wocky-tls.c:1111
#15 0x00007ffff6578929 in ?? () from /usr/lib/libgio-2.0.so.0
#16 0x00007ffff659010c in ?? () from /usr/lib/libgio-2.0.so.0
#17 0x00007ffff59fa29d in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0
#18 0x00007ffff59faa78 in ?? () from /usr/lib/libglib-2.0.so.0
#19 0x00007ffff59fb0ba in g_main_loop_run () from /usr/lib/libglib-2.0.so.0
#20 0x00007ffff6bbe04f in tp_run_connection_manager () from /usr/lib/libtelepathy-glib.so.0
#21 0x0000000000431e81 in gabble_main (argc=1, argv=0x7fffffffdea8) at gabble.c:177
#22 0x0000000000431b09 in main (argc=1, argv=0x7fffffffdea8) at main.c:28

Look at that count=4294967269 buffer length (#3), that can't be right. Of
the three giovecs used, the first two have 4294967269 length, the
third one has a more sane 53.

Also attached a valgrind log. I killed it because it seriously thrashed my laptop, but it did get to a warning about the crashing g_memdup.

This system runs Arch Linux x86_64. I recompiled gnutls and telepathy-gabble using "-O0 -g2" to help debug this.

GnuTLS ticket: https://savannah.gnu.org/support/index.php?107775