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

From: Ion Badulescu
Date: Fri Sep 30 2005 - 15:57:32 EST


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.
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