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[Jacob Nevins <1310800@xxxxxxxxxxxxxxxxxx>]

I guess it's down to me then...

Changed back to 'Confirmed', since the problem is readily reproducible
for me, although it doesn't occur every time -- once I plugged the
tablet in without triggering a crash (and it then worked correctly in my
limited testing).

I've tried persuading this USB-stick-based system to save kernel crash
dumps, without success so far. I guess that I might have to accelerate
my upgrade of this machine to 14.04 to investigate this properly. What
would be useful diagnostic information for me to acquire?

In the meantime, here's another manually-transcribed kernel panic --
this one includes the top of the backtrace so may be more useful.

(All three panics so far -- Romano's and my two -- are consistent in
being at "EIP: [<c14e6863>] input_event+0x23/0x70", despite other
differences.)

...
[  172.825778] ESI: 00000000 EDI: f4f46614 EBP: e9265d84 ESP: e9265d6c
[  172.825778]  DS: 007b ES: 007b FS: 00d8 GS: 00e0 SS: 0068
[  172.825778] CR0: 80050033 CR2: 00000018 CR3: 2f42c000 CR4: 000007f0
[  172.825778] Stack:
[  172.825778]  c14a2189 0000000e f74b9c08 e9268400 00000000 f4f46614 e9265de4 f93cba1c
[  172.825778]  00000000 e9265da8 c1050312 fffb9000 f65c22a0 00000000 e9265db0 c10501a3
[  172.825778]  f65c22c0 e9265e20 c1128da9 00000002 000000c1 0002f02f 00000000 00000002
[  172.825778] Call Trace:
[  172.825778]  [<c14a2189>] ? usb_hcd_giveback_urb+0x99/0x100
[  172.825778]  [<f93cba1c>] wacom_wac_irq+0x19bc/0x1b00 [wacom]
[  172.825778]  [<c1050312>] ? kmap_atomic_prot+0xe2/0x100
[  172.825778]  [<c10501a3>] ? __kunmap_atomic+0x63/0x80
[  172.825778]  [<c1128da9>] ? get_page_from_freelist+0x299/0x600
[  172.825778]  [<f93cc8c1>] wacom_sys_irq+0x41/0x100 [wacom]
[  172.825778]  [<c1088d58>] ? update_curr+0xa8/0x1e0
[  172.825778]  [<c14c572c>] ? uhci_free_urb_priv+0xac/0xc0
[  172.825778]  [<c14a2076>] __usb_hcd_giveback_urb+0x66/0xe0
[  172.825778]  [<c14a2126>] usb_hcd_giveback_urb+0x36/0x100
[  172.825778]  [<c14c6480>] uhci_giveback_urb+0x90/0x2b0
[  172.825778]  [<c14bc22f>] ? ehci_irq+0x30f/0x480
[  172.825778]  [<c114225b>] ? __do_fault+0x24b/0x570
[  172.825778]  [<c14c6ce3>] uhci_scan_schedule+0x333/0x8d0
[  172.825778]  [<c14c7317>] uhci_irq+0x97/0x140
[  172.825778]  [<c1087871>] ? set_next_entity+0xb1/0xe0
[  172.825778]  [<c14a1661>] usb_hcd_irq+0x21/0x30
[  172.825778]  [<c10a5ba5>] handle_irq_event_percpu+0x35/0x1a0
[  172.825778]  [<c1655e17>] ? __do_page_fault+0x237/0x510
[  172.825778]  [<c10a5d41>] handle_irq_event+0x31/0x50
[  172.825778]  [<c10a86ae>] handle_fasteoi_irq+0x4e/0xe0
[  172.825778]  [<c1011847>] handle_irq+0x37/0x90
[  172.825778]  [<c165a26c>] do_IRQ+0x3c/0xb0
[  172.825778]  [<c165a033>] common_interrupt+0x33/0x38
[  172.825778] Code: ff 8d b4 26 00 00 00 00 55 89 e5 57 56 53 83 ec 0c 3e 8d 74 26 00 83 fa 1f 89 c3 76 0b 83 c4 0c 5b 5e 5f 5d c3 8d 76 00 89 4d ec <0f> a3 50 18 19 c0 85 c0 89 55 f0 74 e5 8d b3 8c 01 00 00 89 f0
[  172.825778] EIP: [<c14e6863>] input_event+0x23/0x70 SS:ESP 0068:e9265d6c
[  172.825778] CR2: 0000000000000018

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https://bugs.launchpad.net/bugs/1310800

Title:
  056a:0302 Trusty Tahr, kernel 3.13: automatic load of wacom.ko driver
  cause a "hard" kernel panic

Status in “linux” package in Ubuntu:
  Confirmed

Bug description:
  I have just upgraded to 14.04 from 13.10.

  I have a wacom cth-480  touch+pen tablet, which was not recognized on
  13.10 (kernel 3.11). With the stock kernel from 14.04, I have an
  immediate kernel panic as soon as I plug in the tablet to the laptop.

  The system is a asus 1005PE (32 bit install), Xubuntu, up-to date:
  Linux asus-romano 3.13.0-24-generic #46-Ubuntu SMP Thu Apr 10 19:08:14
  UTC 2014 i686 i686 i686 GNU/Linux

  The really strange thing is that if I manually load the driver with
  `sudo modprobe wacom` *before* pluggin the tablet in, then the tablet
  is recognized and works ok:

  SYS: Apr 21 15:15:47 asus-romano kernel: [  265.664161] usbcore: registered new interface driver wacom
  SYS: Apr 21 15:15:52 asus-romano kernel: [  270.088161] usb 2-1: new full-speed USB device number 2 using uhci_hcd
  SYS: Apr 21 15:15:52 asus-romano kernel: [  270.253626] usb 2-1: New USB device found, idVendor=056a, idProduct=0302
  SYS: Apr 21 15:15:52 asus-romano kernel: [  270.253641] usb 2-1: New USB device strings: Mfr=1, Product=2, SerialNumber=0
  SYS: Apr 21 15:15:52 asus-romano kernel: [  270.253651] usb 2-1: Product: Intuos PTS
  SYS: Apr 21 15:15:52 asus-romano kernel: [  270.253659] usb 2-1: Manufacturer: Wacom Co.,Ltd.
  SYS: Apr 21 15:15:52 asus-romano kernel: [  270.257027] input: Wacom Intuos PT S Pen as /devices/pci0000:00/0000:00:1d.0/usb2/2-1/2-1:1.0/input/input14
  SYS: Apr 21 15:15:52 asus-romano kernel: [  270.260630] input: Wacom Intuos PT S Finger as /devices/pci0000:00/0000:00:1d.0/usb2/2-1/2-1:1.1/input/input15
  SYS: Apr 21 15:15:52 asus-romano mtp-probe: checking bus 2, device 2: "/sys/devices/pci0000:00/0000:00:1d.0/usb2/2-1"
  SYS: Apr 21 15:15:52 asus-romano mtp-probe: bus: 2, device: 2 was not an MTP device

  A screenshot of the kernel panic is added. I can reproduce it at will.

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