I've gotten a report about Terminal crashing when closing tabs in Fedora development. This does not occur in Fedora 7, so it's likely related to bleeding edge vte/glib/something. 

See redhat bugzilla bug: https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=248316

The stack trace (from the above reporter): 

Program received signal SIGSEGV, Segmentation fault.
0x001ef089 in mark_input_source_invalid (terminal=0x9bed890) at vte.c:2739
2739            terminal->pvt->pty_input_source = VTE_INVALID_SOURCE;
(gdb) bt
#0  0x001ef089 in mark_input_source_invalid (terminal=0x9bed890) at vte.c:2739
#1  0x008d88f4 in g_source_callback_unref (cb_data=0x9d69250) at gmain.c:1182
#2  0x008d91da in IA__g_main_context_dispatch (context=0x9ae73f0) at gmain.c:2069
#3  0x008dc5ef in g_main_context_iterate (context=0x9ae73f0, block=1,
dispatch=1, self=0x9af68f0) at gmain.c:2694
#4  0x008dc999 in IA__g_main_loop_run (loop=0x9acf978) at gmain.c:2898
#5  0x003f04e4 in IA__gtk_main () at gtkmain.c:1144
#6  0x080522ad in main (argc=1, argv=0xbf82db04) at main.c:277
#7  0x00987f70 in __libc_start_main () from /lib/libc.so.6
#8  0x08051811 in _start ()

vte bug or Terminal bug?