Filed in Launchpad:

#0  0xb7f2ee52 in read () from /lib/tls/i686/cmov/libc.so.6
No locals.
#1  0xb7e49bfe in _xcb_in_read (c=0x8464e08) at /usr/include/bits/unistd.h:45
	n = 32
#2  0xb7e4a2a0 in xcb_poll_for_event (c=0x8464e08)
    at /build/buildd/libxcb-1.1.93/./src/xcb_in.c:439
	ret = (xcb_generic_event_t *) 0x0
#3  0xb7fff459 in wait_or_poll_for_event (dpy=0x8464690, wait=11)
    at ../../src/xcb_io.c:145
	c = (xcb_connection_t *) 0x8464e08
	event = <value optimized out>
#4  0xb7fff607 in process_responses (dpy=0x8464690, wait_for_first_event=0, 
    current_error=0x0, current_request=0) at ../../src/xcb_io.c:209
	req = (PendingRequest *) 0x846e280
	event_sequence = <value optimized out>
	reply = (void *) 0xb80dd828
	event = (xcb_generic_event_t *) 0x846e128
	error = (xcb_generic_error_t *) 0xb80cde7b
	c = (xcb_connection_t *) 0x8464e08
	__PRETTY_FUNCTION__ = "process_responses"
#5  0xb80000e5 in _XEventsQueued (dpy=0x8464690, mode=2)
    at ../../src/xcb_io.c:256
No locals.
#6  0xb7fe8738 in XPending (dpy=0x8464690) at ../../src/Pending.c:56
	ret_val = 0
#7  0x0804b396 in x11_handle_event () at dbus-launch-x11.c:453
No locals.
#8  0x080498bd in kill_bus_when_session_ends () at dbus-launch.c:471
	tty_fd = -1
	x_fd = 6
	read_set = {__fds_bits = {64, 0 <repeats 31 times>}}
	err_set = {__fds_bits = {0 <repeats 32 times>}}
	act = {__sigaction_handler = {
    sa_handler = 0x80494a0 <signal_handler>, 
    sa_sigaction = 0x80494a0 <signal_handler>}, sa_mask = {__val = {
      0 <repeats 32 times>}}, sa_flags = 0, sa_restorer = 0xbfcdb21c}
	empty_mask = {__val = {0 <repeats 32 times>}}
#9  0x0804a97f in main (argc=6, argv=0xbfcdb8b4) at dbus-launch.c:649
	write_pid_fd_as_string = "e0e108b621904f2255ed69a749a843b4\000\000\000\000\004\000\000\000Î\005\f¸\220\002\f¸\000\000\000\000\000\000\000\000õP\r¸\b\000\000"
	write_address_fd_as_string = '\0' <repeats 36 times>, "õÌÍ¿N\237ì·ÙÁ÷·ôß\004\b\b¸Í¿l\217\004\bô\237û·"
	prev_arg = 0xbfcdcd0a "--exit-with-session"
	shname = <value optimized out>
	runprog = 0xbfcdcd1e "/usr/bin/pulse-session"
	remaining_args = 3
	exit_with_session = 1
	binary_syntax = 0
	c_shell_syntax = 0
	bourne_shell_syntax = 0
	auto_shell_syntax = 0
	autolaunch = 0
	requires_arg = 0
	close_stderr = 0
	i = <value optimized out>
	bus_pid_to_launcher_pipe = {4, 6}
	bus_pid_to_babysitter_pipe = {10, 11}
	bus_address_to_launcher_pipe = {8, 9}
	config_file = 0x0