Re: Kernel 2.6.14 and old versions of traceroute

[Steffen Moser]

Hi David,

* On Mon, Oct 31, 2005 at 07:30 PM (+0000), David R wrote:

> I've noticed that old versions of traceroute no longer work properly
> with the latest kernel. 2.6.13.4 is OK. I've done a bit of strace and am
> posting the differences here. These are from a 64 bit kernel using
> traceroute 0.6.2 as shipped with most versions of SuSE. 

I am experiencing exactly the same problem with traceroute-0.6.2 
running on SuSE 10.0 together with kernel 2.6.14. The whole thing
happens on a single core dual Opteron machine. I've tested this
kernel version on that machine only, yet.

I've also tried the latest traceroute version (1.0.2) from

  ftp://ftp.lst.de/pub/people/okir/traceroute/

and experienced the same behaviour.

Olaf Kirch has just sent me a patch against 2.6.14. It has also 
been discussed in NETDEV. 

This fixed it for me:

--- a/net/core/datagram.c       2005-11-01 11:38:31.000000000 +0100
+++ b/net/core/datagram.c       2005-11-01 11:38:45.000000000 +0100
@@ -213,6 +213,10 @@
 {
        int i, err, fraglen, end = 0;
        struct sk_buff *next = skb_shinfo(skb)->frag_list;
+
+       if (!len)
+               return 0;
+
 next_skb:
        fraglen = skb_headlen(skb);
        i = -1;

Bye,
Steffen
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