pending em0 commits for FreeBSD 8.1 STABLE

[Bjoern A. Zeeb]

On Fri, 29 Oct 2010, Mike Tancsa wrote:

Hi Mike,

> Actually,
>        I dont think its an em bug as I can trigger this crash with the igb 
> nic. Perhaps these are 2 different issues being hit ? Anyways, I tried with

Yes what you have down there looks *sigh* hopefully like a different
issue thought it mbuf fiddling again but way further up the stack.

Could you please concentrate on only reproducing the
 	if<n>: discard frame w/o packet header
issue rather than breaking things left and right as well? ;-)


> igb from HEAD in case there is some common code path between em and igb 
> (2.0.1 vs 2.0.4). But the issue is still there
>
> In the netperf cluster its trivial to trigger this bug. Try this on camel and 
> leopard1. Note bear1 is still on the console debugger as well in case you 
> want to compare 2 different machines.

I shall when returning home tonight.


> camel1# route add -inet6 2607:f3e0:0:80::290 2607:f3e0:9::107
> add host 2607:f3e0:0:80::290: gateway 2607:f3e0:9::107
> camel1#
>
> Then start a ping on camel1.  Then, with the ping is going, on leopard1 do an 
> ifconfig em0 down. A few seconds later, the panic below

just to confirm, it's camel1 that paniced in this test, right?


> ip6_input() at ip6_input+0x28f

Could you look that up? feel free to reboot camel1.  I would guess
it's the MCLGET() in the code with the "L2 bridge ..." comment on top?
Probably a m_clget() call if you look it up in gdb.

/bz

-- 
Bjoern A. Zeeb                              Welcome a new stage of life.
         <ks> Going to jail sucks -- <bz> All my daemons like it!
   http://www.freebsd.org/doc/en_US.ISO8859-1/books/handbook/jails.html