Hello.

I re-installed this yesterday and yes it is still an issue.

lsusb:
Bus 001 Device 002: ID 0424:9512 Standard Microsystems Corp.
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 001 Device 003: ID 0424:ec00 Standard Microsystems Corp.

uname -a:
Linux pi 4.1.7+ #817 PREEMPT Sat Sep 19 15:25:36 BST 2015 armv6l GNU/Linux

Thanks,
Daniel


On Tue, Jan 12, 2016 at 5:26 PM, Diederik <email address hidden> wrote:

> Is this still an issue?
>
> If so, could you provide the output of 'lsusb' and 'uname -a' ?
>
> ** Changed in: raspbian
>        Status: New => Incomplete
>
> --
> You received this bug notification because you are subscribed to the bug
> report.
> https://bugs.launchpad.net/bugs/1236475
>
> Title:
>   USB 3G modem causes system crash - WARNING: at include/linux/kref.h:42
>   usb_get_urb+0x40/0x48()
>
> Status in Raspbian:
>   Incomplete
>
> Bug description:
>   USB 3G modem with active PPP connection ocassionally causes system
>   crash with following message in /var/log/messages:
>
>   Oct  5 13:20:46 linux kernel: [83312.629525] ------------[ cut here
> ]------------
>   Oct  5 13:20:46 linux kernel: [83312.629598] WARNING: at
> include/linux/kref.h:42 usb_get_urb+0x40/0x48()
>   Oct  5 13:20:46 linux kernel: [83312.629636] Modules linked in:
> ppp_deflate zlib_deflate zlib_inflate bsd_comp ppp_async crc_ccitt
> ppp_generic slhc w1_therm w1_gpio wire cn snd_bcm2835 snd_pcm snd_seq
> snd_timer snd_seq_device snd snd_page_alloc sr_mod cdrom option usb_wwan
> cdc_ncm usbserial leds_gpio led_class
>   Oct  5 13:20:46 linux kernel: [83312.629789] [<c0013a7c>]
> (unwind_backtrace+0x0/0xf0) from [<c001e2b4>]
> (warn_slowpath_common+0x4c/0x64)
>   Oct  5 13:20:46 linux kernel: [83312.629818] [<c001e2b4>]
> (warn_slowpath_common+0x4c/0x64) from [<c001e2e8>]
> (warn_slowpath_null+0x1c/0x24)
>   Oct  5 13:20:46 linux kernel: [83312.629863] [<c001e2e8>]
> (warn_slowpath_null+0x1c/0x24) from [<c027473c>] (usb_get_urb+0x40/0x48)
>   Oct  5 13:20:46 linux kernel: [83312.629894] [<c027473c>]
> (usb_get_urb+0x40/0x48) from [<c02732a8>] (usb_hcd_submit_urb+0x2c/0x77c)
>   Oct  5 13:20:46 linux kernel: [83312.629950] [<c02732a8>]
> (usb_hcd_submit_urb+0x2c/0x77c) from [<bf02cb44>]
> (usb_wwan_write+0x14c/0x2d4 [usb_wwan])
>   Oct  5 13:20:46 linux kernel: [83312.630066] [<bf02cb44>]
> (usb_wwan_write+0x14c/0x2d4 [usb_wwan]) from [<bf0084cc>]
> (serial_write+0x58/0xbc [usbserial])
>   Oct  5 13:20:46 linux kernel: [83312.630155] [<bf0084cc>]
> (serial_write+0x58/0xbc [usbserial]) from [<bf12410c>]
> (ppp_async_push+0x37c/0x598 [ppp_async])
>   Oct  5 13:20:46 linux kernel: [83312.630208] [<bf12410c>]
> (ppp_async_push+0x37c/0x598 [ppp_async]) from [<bf1244e8>]
> (ppp_async_process+0x60/0x74 [ppp_async])
>   Oct  5 13:20:46 linux kernel: [83312.630275] [<bf1244e8>]
> (ppp_async_process+0x60/0x74 [ppp_async]) from [<c0025710>]
> (tasklet_action+0x60/0xb4)
>   Oct  5 13:20:46 linux kernel: [83312.630307] [<c0025710>]
> (tasklet_action+0x60/0xb4) from [<c0025840>] (__do_softirq+0xa0/0x154)
>   Oct  5 13:20:46 linux kernel: [83312.630334] [<c0025840>]
> (__do_softirq+0xa0/0x154) from [<c0025d08>] (irq_exit+0x8c/0x94)
>   Oct  5 13:20:46 linux kernel: [83312.630383] [<c0025d08>]
> (irq_exit+0x8c/0x94) from [<c000e920>] (handle_IRQ+0x34/0x84)
>   Oct  5 13:20:46 linux kernel: [8Oct  5 13:17:16 linux kernel: imklog
> 5.8.11, log source = /proc/kmsg started.
>
>   Sometimes the system runs without problem for 1 month, sometimes crashes
> after 1 day.
>   Used USB modem:  Huawei E303
>   Linux version: Linux linux 3.6.11+ #474 PREEMPT Thu Jun 13 17:14:42 BST
> 2013 armv6l GNU/Linux
>
>   Thanks for help!
>
> To manage notifications about this bug go to:
> https://bugs.launchpad.net/raspbian/+bug/1236475/+subscriptions
>



-- 

Regards/Mvh
Daniel Lundh