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[Xen-users] Re: kernel oops/IRQ exception when networking between many d

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Subject: [Xen-users] Re: kernel oops/IRQ exception when networking between many domUs
From: Birger Toedtmann <btoedtmann@xxxxxxxxxxxxxx>
Date: Mon, 6 Jun 2005 08:42:53 +0200
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Keir Fraser schrieb am Sun, Jun 05, 2005 at 05:52:13PM +0100:
> On 4 Jun 2005, at 18:05, Birger Tödtmann wrote:
> >Funnily, nothing happend after
> >starting the first 10-12 nodes, but after "xm create"ing one or two 
> >more
> >nodes, the system oopsed with at least some info, but sysrq gone as
> >well.  So I wrote it down on a peace of paper ;-) , hopefully someone
> >can make sense of it:
> Do you have the vmlinux file? It would be useful to know where in 
> net_rx_action the crash is happening.

Apparently it is happening somewhere here:

0xc028cbe5 <net_rx_action+1135>:        test   %eax,%eax
0xc028cbe7 <net_rx_action+1137>:        je     0xc028ca82 <net_rx_action+780>
0xc028cbed <net_rx_action+1143>:        mov    %esi,%eax
0xc028cbef <net_rx_action+1145>:        shr    $0xc,%eax
0xc028cbf2 <net_rx_action+1148>:        mov    %eax,(%esp)
0xc028cbf5 <net_rx_action+1151>:        call   0xc028c4c4 <free_mfn>
0xc028cbfa <net_rx_action+1156>:        mov    $0xffffffff,%ecx
0xc028cbff <net_rx_action+1161>:        jmp    0xc028ca82 <net_rx_action+780>
0xc028cc04 <net_rx_action+1166>:        call   0xc02c59fe <net_ratelimit>
0xc028cc09 <net_rx_action+1171>:        test   %eax,%eax
0xc028cc0b <net_rx_action+1173>:        jne    0xc028cc47 <net_rx_action+1233>
0xc028cc0d <net_rx_action+1175>:        mov    0xc0378b60,%eax

which is, I presume, reflected by this section within net_rx_action():

        /* Check the reassignment error code. */
        status = NETIF_RSP_OKAY;
        if ( unlikely(mcl[1].args[5] != 0) )
            DPRINTK("Failed MMU update transferring to DOM%u\n", netif->domid);
            free_mfn(mdata >> PAGE_SHIFT);
            status = NETIF_RSP_ERROR;

Kernel image and System.map attached.

Birger Tödtmann
Technik der Rechnernetze, Institut für Experimentelle Mathematik und Institut 
für Informatik und Wirtschaftsinformatik, Universität Duisburg-Essen
email:btoedtmann@xxxxxxxxxxxxxx skype:birger.toedtmann pgp:0x6FB166C9 

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