Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]

Groups > linux.debian.kernel > #59152

Bug#878242: linux-image-4.12.0-2-marvell: flood of messages "mv643xx_eth_port mv643xx_eth_port.0 eth0: failed to linearize skb with tiny unaligned fragment"

Cross-posted to 2 groups.

Show all headers | View raw

[Multipart message — attachments visible in raw view] - view raw

On Wed, 2017-10-11 at 11:48 -0300, rbrito@ime.usp.br wrote:
> Package: src:linux
> Version: 4.12.13-1
> Severity: normal
> 
> 
> Hi.
> 
> I am using an armel system with only 128MB of RAM (a KuroBox Pro) running
> Debian testing and, if my memory serves me well, I started seeing lots and
> lots of messages like:
> 
>     mv643xx_eth_port mv643xx_eth_port.0 eth0: failed to linearize skb with tiny unaligned fragment
> 
> on my dmesg after I upgraded to kernel 4.12. I don't know if this is a
> serious problem or only a cosmetic issue.
[...]

This message and the code that generates it have been present in the
mv643xx_eth driver for a long time.  The network interface hardware is
generally capable of transmitting a packet that comes from multiple
buffers in memory, but in some cases the driver copies all the data
into a single buffer, probably to avoid a hardware bug.  If there is
not enough memory to make that copy then it logs this message.

I think the driver should drop the packet if this happens, but instead
it just reports that the hardware is busy.  That will cause the kernel
to try sending the packet again repeatedly, resulting in repetition of
this log message until there is more memory available.

If you haven't seen this error message before, it might be triggered by
an application change.  But I think it's more likely to be caused by
higher memory usage or fragmentation of memory.

Ben.

-- 
Ben Hutchings
Man invented language to satisfy his deep need to complain. - Lily
Tomlin

Back to linux.debian.kernel | Previous | Next — Next in thread | Find similar | Unroll thread

Thread

Bug#878242: linux-image-4.12.0-2-marvell: flood of messages "mv643xx_eth_port mv643xx_eth_port.0 eth0: failed to linearize skb with tiny unaligned fragment" Ben Hutchings <ben@decadent.org.uk> - 2017-10-13 00:10 +0200
  Bug#878242: linux-image-4.12.0-2-marvell: flood of messages "mv643xx_eth_port mv643xx_eth_port.0 eth0: failed to linearize skb with tiny unaligned fragment" Ben Hutchings <ben@decadent.org.uk> - 2017-10-13 00:20 +0200
    Bug#878242: linux-image-4.12.0-2-marvell: flood of messages "mv643xx_eth_port mv643xx_eth_port.0 eth0: failed to linearize skb with tiny unaligned fragment" Rogério Brito <rbrito@ime.usp.br> - 2017-10-19 20:50 +0200
  Bug#878242: linux-image-4.12.0-2-marvell: flood of messages "mv643xx_eth_port mv643xx_eth_port.0 eth0: failed to linearize skb with tiny unaligned fragment" Rogério Brito <rbrito@ime.usp.br> - 2017-10-13 00:30 +0200

csiph-web