From mboxrd@z Thu Jan  1 00:00:00 1970
From: Marc Kleine-Budde <mkl@pengutronix.de>
Subject: Re: Stuck vcan
Date: Tue, 11 Mar 2014 21:56:57 +0100
Message-ID: <531F7899.3010205@pengutronix.de>
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To: Austin Schuh <austin@peloton-tech.com>, Oliver Hartkopp <socketcan@hartkopp.net>
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On 03/11/2014 09:37 PM, Austin Schuh wrote:
> I'm not trying to cause problems ;)

:D

> Neither of those helped.
>=20
> # ifconfig vcan0
> vcan0     Link encap:UNSPEC  HWaddr
> 00-00-00-00-00-00-00-00-00-00-00-00-00-00-00-00
>           UP RUNNING NOARP  MTU:16  Metric:1
>           RX packets:428406 errors:0 dropped:0 overruns:0 frame:0
>           TX packets:428406 errors:0 dropped:0 overruns:0 carrier:0
>           collisions:0 txqueuelen:0
>           RX bytes:3427248 (3.2 MiB)  TX bytes:3427248 (3.2 MiB)
>=20
> # ip link show vcan0
> 17: vcan0: <NOARP,UP,LOWER_UP,ECHO> mtu 16 qdisc noqueue state UNKNOWN
> mode DEFAULT
>     link/can
>=20
> # ifconfig vcan0
> vcan0     Link encap:UNSPEC  HWaddr
> 00-00-00-00-00-00-00-00-00-00-00-00-00-00-00-00
>           UP RUNNING NOARP  MTU:16  Metric:1
>           RX packets:1400094 errors:0 dropped:0 overruns:0 frame:0
>           TX packets:1400094 errors:0 dropped:0 overruns:0 carrier:0
>           collisions:0 txqueuelen:10
>           RX bytes:11200752 (10.6 MiB)  TX bytes:11200752 (10.6 MiB)
>=20
> # ip link show vcan0
> 17: vcan0: <NOARP,UP,LOWER_UP,ECHO> mtu 16 qdisc noqueue state UNKNOWN
> mode DEFAULT qlen 10
>     link/can
>=20
> Both times, I get the following.
>=20
> Mar 11 13:28:58 aschuh-peloton kernel: [96229.460901] Dead loop on
> virtual device vcan0, fix it urgently!
> Mar 11 13:28:59 aschuh-peloton kernel: [96230.313875] Dead loop on
> virtual device vcan0, fix it urgently!
> Mar 11 13:28:59 aschuh-peloton kernel: [96230.319494] Dead loop on
> virtual device vcan0, fix it urgently!
> Mar 11 13:29:00 aschuh-peloton kernel: [96231.072617] Dead loop on
> virtual device vcan0, fix it urgently!
>=20
> Luckily, it is easy to reproduce.  I have some trivial code which
> sends out 10,000 msgs/sec on the vcan.  I run 3+ copies of the code on
> a dual core machine with hyperthreads enabled.  More parallel sends
> should cause it to occur more frequently.

Can you share the code?

Marc

--=20
Pengutronix e.K.                  | Marc Kleine-Budde           |
Industrial Linux Solutions        | Phone: +49-231-2826-924     |
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