Comment 15 for bug 1310800

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