openSUSE 10.3 system, sometimes (preferably after a suspend-resume cycle,
but this does not seem to be a prerequisite), hald-addon-input seems to end
up in an endless loop -- the fan informs me about it: it eats 100% CPU then.

(Lenovo Thinkpad X61 tablet -- openSUSE10.3, x86-64, kernel 2.6.25.5-1.1,
hal-0.5.9_git20070831-13.3, glib2-2.14.1-4.2)

0x00007f0ae7a149af in *__GI___poll (fds=0x610880, nfds=11, timeout=-1)
    at ../sysdeps/unix/sysv/linux/poll.c:83
83          return INLINE_SYSCALL (poll, 3, CHECK_N (fds, nfds), nfds, timeout);
(gdb) bt
#0  0x00007f0ae7a149af in *__GI___poll (fds=0x610880, nfds=11, timeout=-1)
    at ../sysdeps/unix/sysv/linux/poll.c:83
#1  0x00007f0ae7cd1367 in g_main_context_iterate (context=0x6073c0, block=1, dispatch=1, 
    self=<value optimized out>) at gmain.c:2996
#2  0x00007f0ae7cd17f7 in IA__g_main_loop_run (loop=0x606cc0) at gmain.c:2898
#3  0x0000000000402005 in main (argc=<value optimized out>, argv=<value optimized out>)
    at addon-input.c:478
(gdb) f 2
#2  0x00007f0ae7cd17f7 in IA__g_main_loop_run (loop=0x606cc0) at gmain.c:2898
2898        g_main_context_iterate (loop->context, TRUE, TRUE, self);
(gdb) p *(loop->context)
$4 = {mutex = {runtime_mutex = 0x0, static_mutex = {pad = '\0' <repeats 39 times>, 
      dummy_double = 0, dummy_pointer = 0x0, dummy_long = 0}}, cond = 0x0, owner = 0x609150, 
  owner_count = 2, waiters = 0x0, ref_count = 3, pending_dispatches = 0x608200, timeout = -1, 
  next_id = 231, source_list = 0x606620, in_check_or_prepare = 0, poll_records = 0x608900, 
  n_poll_records = 11, cached_poll_array = 0x610880, cached_poll_array_size = 11, 
  wake_up_pipe = {-1, -1}, wake_up_rec = {fd = 0, events = 0, revents = 0}, poll_waiting = 1, 
  poll_changed = 0, poll_func = 0x7f0ae7a14980 <*__GI___poll>, current_time = {tv_sec = 0, 
    tv_usec = 0}, time_is_current = 0}

Hints on how to debug this are welcome.