Comment 4 for bug 473613

I managed to get more verbose errors in /var/log/messages trying to launch bash under xfce4. This may hold more clues:

Nov 17 11:40:41 kereru kernel: [ 6240.513550] bash D c08145c0 0 3469 1 0x00000000
Nov 17 11:40:41 kereru kernel: [ 6240.513561] f4159c44 00000046 f68f8000 c08145c0 f403a848 c08145c0 2c53382e 0000057d
Nov 17 11:40:41 kereru kernel: [ 6240.513577] c08145c0 c08145c0 f403a848 c08145c0 00000000 0000057d c08145c0 f4024000
Nov 17 11:40:41 kereru kernel: [ 6240.513592] f403a5b0 f4159cf8 7fffffff f4159cfc f4159ca0 c056f0d5 c01501f6 0000057d
Nov 17 11:40:41 kereru kernel: [ 6240.513610] Call Trace:
Nov 17 11:40:41 kereru kernel: [ 6240.513618] [<c056f0d5>] schedule_timeout+0x185/0x200
Nov 17 11:40:41 kereru kernel: [ 6240.513626] [<c01501f6>] ? run_timer_softirq+0x156/0x200
Nov 17 11:40:41 kereru kernel: [ 6240.513638] [<c016a125>] ? tick_dev_program_event+0x45/0xe0
Nov 17 11:40:41 kereru kernel: [ 6240.513649] [<c0133080>] ? __wake_up+0x40/0x50
Nov 17 11:40:41 kereru kernel: [ 6240.513657] [<c056edf2>] wait_for_common+0xa2/0x120
Nov 17 11:40:41 kereru kernel: [ 6240.513667] [<c013c5a0>] ? default_wake_function+0x0/0x10
Nov 17 11:40:41 kereru kernel: [ 6240.513675] [<c056ef02>] wait_for_completion+0x12/0x20
Nov 17 11:40:41 kereru kernel: [ 6240.513685] [<c01580cd>] flush_cpu_workqueue+0x4d/0x80
Nov 17 11:40:41 kereru kernel: [ 6240.513694] [<c0158170>] ? wq_barrier_func+0x0/0x10
Nov 17 11:40:41 kereru kernel: [ 6240.513703] [<c0158fd6>] flush_workqueue+0x36/0x60
Nov 17 11:40:41 kereru kernel: [ 6240.513711] [<c015900d>] flush_scheduled_work+0xd/0x10
Nov 17 11:40:41 kereru kernel: [ 6240.513720] [<c0385202>] tty_ldisc_release+0x22/0x70
Nov 17 11:40:41 kereru kernel: [ 6240.513730] [<c037f8e0>] tty_release_dev+0x340/0x500
Nov 17 11:40:41 kereru kernel: [ 6240.513743] [<c0487065>] ? apparmor_file_free_security+0x35/0x40
Nov 17 11:40:41 kereru kernel: [ 6240.513754] [<c01fd88a>] ? mntput_no_expire+0x1a/0xd0
Nov 17 11:40:41 kereru kernel: [ 6240.513764] [<c037fab2>] tty_release+0x12/0x20
Nov 17 11:40:41 kereru kernel: [ 6240.513774] [<c01e8cba>] __fput+0xda/0x1f0
Nov 17 11:40:41 kereru kernel: [ 6240.513782] [<c01e8de5>] fput+0x15/0x20
Nov 17 11:40:41 kereru kernel: [ 6240.513790] [<c01e53d7>] filp_close+0x47/0x70
Nov 17 11:40:41 kereru kernel: [ 6240.513798] [<c0146c93>] put_files_struct+0x63/0xb0
Nov 17 11:40:41 kereru kernel: [ 6240.513806] [<c0146d23>] exit_files+0x43/0x60
Nov 17 11:40:41 kereru kernel: [ 6240.513814] [<c0147dff>] do_exit+0x11f/0x2e0
Nov 17 11:40:41 kereru kernel: [ 6240.513823] [<c0152860>] ? dequeue_signal+0xb0/0x170
Nov 17 11:40:41 kereru kernel: [ 6240.513832] [<c0147ffa>] do_group_exit+0x3a/0xb0
Nov 17 11:40:41 kereru kernel: [ 6240.513842] [<c015403f>] get_signal_to_deliver+0x18f/0x300
Nov 17 11:40:41 kereru kernel: [ 6240.513851] [<c010304b>] do_signal+0x6b/0x160
Nov 17 11:40:41 kereru kernel: [ 6240.513861] [<c037dd44>] ? tty_read+0x94/0xb0
Nov 17 11:40:41 kereru kernel: [ 6240.513871] [<c037fc30>] ? tty_ioctl+0x0/0x620
Nov 17 11:40:41 kereru kernel: [ 6240.513879] [<c0153dda>] ? sys_kill+0x5a/0x60
Nov 17 11:40:41 kereru kernel: [ 6240.513888] [<c037dd44>] ? tty_read+0x94/0xb0
Nov 17 11:40:41 kereru kernel: [ 6240.513897] [<c037fc30>] ? tty_ioctl+0x0/0x620
Nov 17 11:40:41 kereru kernel: [ 6240.513906] [<c0318e24>] ? copy_to_user+0x34/0x120
Nov 17 11:40:41 kereru kernel: [ 6240.513913] [<c0318cf8>] ? copy_from_user+0x38/0x130
Nov 17 11:40:41 kereru kernel: [ 6240.513922] [<c0102771>] ? restore_sigcontext+0xc1/0xe0
Nov 17 11:40:41 kereru kernel: [ 6240.513930] [<c010318d>] do_notify_resume+0x4d/0x60
Nov 17 11:40:41 kereru kernel: [ 6240.513939] [<c0103448>] work_notifysig+0x13/0x1b