[  136.088747] pl2303: Prolific PL2303 USB to serial adaptor driver
[  157.880558] usb 5-2: USB disconnect, address 2
[  157.882147] ------------[ cut here ]------------
[  157.882206] kernel BUG at /home/kernel-ppa/mainline/build/drivers/char/tty_ldisc.c:726!
[  157.882267] invalid opcode: 0000 [#1] SMP 
[  157.882406] last sysfs file: /sys/devices/pci0000:00/0000:00:10.3/usb5/5-2/uevent
[  157.882463] Modules linked in: pl2303 usbserial isofs snd_hda_codec_analog snd_hda_intel binfmt_misc snd_hda_codec snd_hwdep snd_pcm_oss snd_mixer_oss snd_pcm snd_seq_dummy nls_cp437 snd_seq_oss cifs snd_seq_midi snd_rawmidi snd_seq_midi_event snd_seq snd_timer snd_seq_device ppdev via_agp snd parport_pc soundcore snd_page_alloc asus_atk0110 i2c_viapro agpgart shpchp psmouse serio_raw lp parport ahci via_rhine mii pata_jmicron libahci sata_via pata_via
[  157.884451] 
[  157.884504] Pid: 28, comm: khubd Tainted: G        W   2.6.35-020635rc1-generic #020635rc1 P5VD2-MX/System Product Name
[  157.884569] EIP: 0060:[<c03ca769>] EFLAGS: 00010202 CPU: 0
[  157.884630] EIP is at tty_ldisc_reinit+0x49/0x50
[  157.884681] EAX: ffffffea EBX: f1399000 ECX: ec8d2e70 EDX: ec8d2d78
[  157.884739] ESI: 00000074 EDI: 00000000 EBP: f719fdcc ESP: f719fdc4
[  157.884792]  DS: 007b ES: 007b FS: 00d8 GS: 00e0 SS: 0068
[  157.884846] Process khubd (pid: 28, ti=f719e000 task=f71a1960 task.ti=f719e000)
[  157.884911] Stack:
[  157.884964]  f1399000 f1399014 f719fde4 c03ca86e 00000001 f1399144 f1399144 f1399000
[  157.885332] <0> f719fe0c c03c318c f719fe00 00000000 00000000 00000001 f1399000 f1399000
[  157.885791] <0> f7391800 f19e6900 f719fe14 c03c3392 f719fe40 f824f65b 00000003 f135d548
[  157.886026] Call Trace:
[  157.886026]  [<c03ca86e>] ? tty_ldisc_hangup+0xfe/0x140
[  157.886026]  [<c03c318c>] ? do_tty_hangup+0x14c/0x340
[  157.886026]  [<c03c3392>] ? tty_vhangup+0x12/0x20
[  157.886026]  [<f824f65b>] ? usb_serial_disconnect+0x8b/0x170 [usbserial]
[  157.886026]  [<c04550f0>] ? usb_unbind_interface+0x40/0x120
[  157.886026]  [<c03ea8d1>] ? __device_release_driver+0x51/0xa0
[  157.886026]  [<c03eae05>] ? device_release_driver+0x25/0x40
[  157.886026]  [<c03ea157>] ? bus_remove_device+0x57/0x80
[  157.886026]  [<c03e7a7f>] ? device_del+0xff/0x160
[  157.886026]  [<c0452201>] ? usb_disable_device+0x81/0xf0
[  157.886026]  [<c044b85e>] ? usb_disconnect+0x8e/0x100
[  157.886026]  [<c044d8d4>] ? hub_port_connect_change+0x334/0x650
[  157.886026]  [<c0452b30>] ? usb_control_msg+0xb0/0x110
[  157.886026]  [<c044a470>] ? clear_port_feature+0x50/0x60
[  157.886026]  [<c044de12>] ? hub_events+0x222/0x440
[  157.886026]  [<c0169ddf>] ? finish_wait+0x4f/0x70
[  157.886026]  [<c044e054>] ? hub_thread+0x24/0x120
[  157.886026]  [<c0169c70>] ? autoremove_wake_function+0x0/0x40
[  157.886026]  [<c044e030>] ? hub_thread+0x0/0x120
[  157.886026]  [<c01699d4>] ? kthread+0x74/0x80
[  157.886026]  [<c0169960>] ? kthread+0x0/0x80
[  157.886026]  [<c0103306>] ? kernel_thread_helper+0x6/0x10
[  157.886026] Code: 89 f0 c7 43 28 00 00 00 00 e8 94 fe ff ff 3d 00 f0 ff ff 77 16 89 c2 89 d8 e8 d4 f6 ff ff 89 f2 89 d8 e8 4b f9 ff ff 5b 5e 5d c3 <0f> 0b eb fe 8d 76 00 55 89 e5 57 56 53 83 ec 04 0f 1f 44 00 00 
[  157.886026] EIP: [<c03ca769>] tty_ldisc_reinit+0x49/0x50 SS:ESP 0068:f719fdc4
[  157.890872] ---[ end trace 121b18c17247b523 ]---