Re: Starfire (Adaptec) kernel 2.6.13+ panics on AMD64 NFS server

[Ion Badulescu <ionut@badula.org>]

On Fri, 30 Sep 2005, Hendrik Visage wrote:

> Anycase, here is a non-PREEMPT traceback.

Same trace, pretty much like I expected. Still, starfire must be getting 
a bad skb from the upper layers, because it gets passed __unmodified__ to 
skb_checksum_help().

Either that, or skb_checksum_help() itself got broken at some point, at 
least on 64-bit platforms.

I'll try to reproduce it over the weekend (assumming I can get an x86_64 
box set up, with a starfire inside) and see where the problem is.

> What makes this one interesting, is that in the preempt case, I had to 
> push the NFS output to get the panic, but the non-preempt case attached, 
> sorta just happened, ie. when the clients just checked on the server's 
> status :(

I'm actually surprised you got your panic from nfsd. skb_checksum_help() 
is called only when one of the fragments has length == 1, so the easiest 
way to hit it is to slowly type something into a telnet session.

Thanks,
Ion

-- 
   It is better to keep your mouth shut and be thought a fool,
             than to open it and remove all doubt.