USB 3G modem causes system crash - WARNING: at include/linux/kref.h:42 usb_get_urb+0x40/0x48()

[Vilem Jirous]

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!

[dlundh (dlundh)]

I started having this after the latest updates to Raspbian last week.

Hardware:
Device : /dev/ttyUSB0
Manufacturer : Huawei
Model : E220 (E220)
Firmware : 11.117.09.00.00

[Diederik (didi-debian)]

Is this still an issue?

If so, could you provide the output of 'lsusb' and 'uname -a' ?

[dlundh (dlundh)]

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:...

[Diederik (didi-debian)]

As this is an issue with the kernel from raspberrypi.org, you should report it here: https://github.com/raspberrypi/linux/issues

Also include the USB ID of your USB 3G modem as that seems to be missing from your 'lsusb' output.
They will also want to know the kernel version, so provide the output of 'uname -a' as well.