Re: Linux 2.2.7-ac1 Path MTU bug
Rob van Nieuwkerk (robn@verdi.et.tudelft.nl)
Wed, 5 May 1999 18:16:27 +0200 (CEST)
Rob van Nieuwkerk wrote:
>
> 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.
Hi again,
Sigh ... just checked: I see there is no gcc package for RH 5.2 / Alpha.
So I assume that egcs-1.0.3a is supposed to be suitable for kernel
compiling. Are the egcs / kernel problems only related to Linux 2.0.x
and/or Intel CPU's ?
So I reissue my original bug-report !
-------------------------------------
Sorry for even more confusion ..
Greetings,
Rob van Nieuwkerk
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