netdev - Re: Fw: [Bug 98781] New: WWAN: TX bytes counter shows very huge impossible value

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Date:	Sat, 13 Jun 2015 00:28:58 +0000 (UTC)
From:	Kevin <kevin.padoa@...il.com>
To:	netdev@...r.kernel.org
Subject: Re: Fw: [Bug 98781] New: WWAN: TX bytes counter shows very huge impossible value

Stephen Hemminger <stephen <at> networkplumber.org> writes:

> 
> 
> Begin forwarded message:
> 
> Date: Sat, 23 May 2015 16:54:50 +0000
> From: "bugzilla-daemon <at> bugzilla.kernel.org" <bugzilla-daemon <at>
bugzilla.kernel.org>
> To: "shemminger <at> linux-foundation.org" <shemminger <at>
linux-foundation.org>
> Subject: [Bug 98781] New: WWAN: TX bytes counter shows very huge
impossible value
> 
> https://bugzilla.kernel.org/show_bug.cgi?id=98781
> 
>             Bug ID: 98781
>            Summary: WWAN: TX bytes counter shows very huge impossible
>                     value
>            Product: Networking
>            Version: 2.5
>     Kernel Version: 4.0.x
>           Hardware: Intel
>                 OS: Linux
>               Tree: Mainline
>             Status: NEW
>           Severity: normal
>           Priority: P1
>          Component: Other
>           Assignee: shemminger <at> linux-foundation.org
>           Reporter: mm <at> superbash.de
>         Regression: No
> 
> Since version 4.0.x the TX bytes counter of the WWAN module shows a weird
> value.
> 
> Example:
> 
> $ > ifconfig wwan
> 
> wwan0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
>         inet xxx.xxx.xxx.xxx  netmask 255.255.255.252  broadcast
> xxx.xxx.xxx.xxx
>         inet6 xxxx::xxxx:xxxx:xxxx:xxxx  prefixlen 64  scopeid 0x20<link>
>         ether xx:xx:xx:xx:xx:xx  txqueuelen 1000  (Ethernet)
>         RX packets 19036  bytes 19190321 (18.3 MiB)
>         RX errors 0  dropped 0  overruns 0  frame 0
>         TX packets 15874  bytes 43228847574631 (39.3 TiB)
>         TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0
> 
> 39.3 TiB - wow, absolutely not true
> 
> The WWAN is used as bridge to my internet provider (LTE usb stick)
> 
> I use the counter to control the traffic. It's only the TX counter, the RX
> works ok.
> 
I have exactly the same issue, exhibited when upgrading (n-1) kernel on
Ubuntu Vivid 15.04 from 3.17.x:

Linux uranis 3.19.0-20-generic #20-Ubuntu SMP Fri May 29 10:10:47 UTC 2015
x86_64 x86_64 x86_64 GNU/Linux

wwan0     Link encap:Ethernet  HWaddr 26:03:a9:e3:88:2e  
          inet addr:41.150.225.132  Bcast:41.150.225.135  Mask:255.255.255.248
          inet6 addr: fe80::2403:a9ff:fee3:882e/64 Scope:Link
          UP BROADCAST RUNNING NOARP MULTICAST  MTU:1500  Metric:1
          RX packets:3366 errors:0 dropped:0 overruns:0 frame:0
          TX packets:3497 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:1459963 (1.4 MB)  TX bytes:15019500985395 (15.0 TB)

Kernel internal or module (driver) bug, shows up everywhere including
'system monitor'. This problem has come up a few years back and was solved,
but seems to be back again...

Any ideas on fix ?







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