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Old 11-15-2008, 11:47 PM
Gerald Villemure
 
Default Bug#498548: SKB BUG: Invalid truesize

I am running kernel:
Linux version 2.6.26-1-686 (Debian 2.6.26-8) (waldi@debian.org) (gcc
version 4.1.3 20080623 (prerelease) (Debian 4.1.2-23)) #1 SMP Thu Oct 9
15:18:09 UTC 2008


On some days I get very few of these in the logs and other days I get
thousands.


Nov 15 11:35:40 server kernel: [660394.963460] SKB BUG: Invalid truesize
(468) len=290, sizeof(sk_buff)=180
Nov 15 11:35:40 server kernel: [660394.993326] SKB BUG: Invalid truesize
(468) len=290, sizeof(sk_buff)=180

57 Thousand Log entries later...
Nov 15 15:34:01 server kernel: [674696.648284] SKB BUG: Invalid truesize
(596) len=421, sizeof(sk_buff)=180
Nov 15 15:34:01 server kernel: [674696.755905] SKB BUG: Invalid truesize
(244) len=76, sizeof(sk_buff)=180


Whats strange is that it stops by itself.

The machine has three physical NIC's and makes use of OpenVPN extensively.

Next time I see the log growing at 10K entries per hour I will turn off
OpenVPN to see if its related.


Gérald



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Old 11-16-2008, 03:14 AM
Ben Hutchings
 
Default Bug#498548: SKB BUG: Invalid truesize

On Sat, 2008-11-15 at 19:47 -0500, Gerald Villemure wrote:
> I am running kernel:
> Linux version 2.6.26-1-686 (Debian 2.6.26-8) (waldi@debian.org) (gcc
> version 4.1.3 20080623 (prerelease) (Debian 4.1.2-23)) #1 SMP Thu Oct 9
> 15:18:09 UTC 2008
>
> On some days I get very few of these in the logs and other days I get
> thousands.
>
> Nov 15 11:35:40 server kernel: [660394.963460] SKB BUG: Invalid truesize
> (468) len=290, sizeof(sk_buff)=180
> Nov 15 11:35:40 server kernel: [660394.993326] SKB BUG: Invalid truesize
> (468) len=290, sizeof(sk_buff)=180
> 57 Thousand Log entries later...
> Nov 15 15:34:01 server kernel: [674696.648284] SKB BUG: Invalid truesize
> (596) len=421, sizeof(sk_buff)=180
> Nov 15 15:34:01 server kernel: [674696.755905] SKB BUG: Invalid truesize
> (244) len=76, sizeof(sk_buff)=180

This typically means that some packet transformation layer in the kernel
is not updating the "truesize" (used for memory accounting) of packets
correctly.

The error messages probably ought to be rate-limited as this is not a
serious error (unless the truesize is wrong by a large amount).

> Whats strange is that it stops by itself.
>
> The machine has three physical NIC's and makes use of OpenVPN extensively.
>
> Next time I see the log growing at 10K entries per hour I will turn off
> OpenVPN to see if its related.

That's certainly worth trying, as OpenVPN is the sort of code that might
cause this bug.

There is an upstream bug report
<http://bugzilla.kernel.org/show_bug.cgi?id=10996> about similar
behaviour when other VPN implementations are used.

Ben.
 
Old 01-07-2009, 01:55 AM
Gerald Villemure
 
Default Bug#498548: SKB BUG: Invalid truesize

I can now confirm that turning off OpenVPN will stop these error messages.

Unfortunately they resume shortly after restarting OpenVPN.

Gérald



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