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SubjectRe: Linux 2.2.7-ac1 Path MTU bug
Date
Andi Kleen wrote:
>
> In muc.lists.linux-kernel, you wrote:
> >
> >Hi,
> >
> >I think I have found a Path MTU Discovery bug in Linux-2.2.7-ac1.
> >
> >1. Linux sends a packet > PMTU
> >2. "ICMP Host Unreachable - need to frag" received
> >3. PMTU-sized packet is sent
> >4. data which comes after the packet from 1. is sent in PMTU-sized
> > packets.
> >
> >The problem is that the data remaining in the packet 1. which comes after
> >the PMTU length is never resent. So the TCP connection stalls at this point.
> >See the tcpdump example below (bytes 1510-1582 are not sent).
> >
> >Sometimes the PMTU mechanism does work OK. The bug is easily reproducable.
> >The problem is not Ultrix related: it happens with HP-UX & Linux too.
> >I did not try a normal (non -ac) 2.2.7 kernel.
>
> I cannot reproduce it here. What compiler do you use?

Hi Andy,

I wanted to reply "the standard gcc that comes with Red Hat 5.2".
I just checked. Shit !!!. Some weeks ago the system was upgraded
(not by me) from RH 4.2 -> 5.2. And in that process the normal
gcc was apparently nuked. So the kernel was compiled with egcs-1.0.3a.

I know what that means ... I'll reinstall gcc and recompile
the kernel. For this moment please ignore my bug report.

Sorry for the confusion.

Greetings,
Rob van Nieuwkerk

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