Re: [Qemu-devel] Intermittent e1000 failure on qemu-kvm 1.0

[Stefan Hajnoczi]

On Tue, Apr 3, 2012 at 2:41 PM, Chris Webb <address@hidden> wrote:
> Stefan Hajnoczi <address@hidden> writes:
>
>> No, that's weird.  I would have simply tried "b start_xmit" and as
>> long as the binary has symbols gdb would know what to do.
>
> I'll get another one and give it a go. There wasn't any particular reason I
> gave a line number rather than a function except that I worried there might
> be start_xmit in a variety of different nic models compiled into qemu so I
> might end up setting the breakpoint on the wrong one. b hw/e1000.c:start_xmit
> maybe?

There is only one start_xmit() in qemu.

>> Are you sure no other guest has the same MAC address or IP address?
>> This weird behavior sounds similar to what happens when you have
>> multiple devices on a network using the same address - the results are
>> very confusing :).
>
> Yes, I agree! However, in this case there's no other guest with the same MAC
> or IP address on the network. I've explicitly rechecked this to be sure, and
> also deliberately varied the MAC address to something I know can't be
> generated by our scripts. In any case, I'm using the same MAC and IP address
> for every reboot of this VM, and usually (19 times out of 20) it works fine.

The lack of ARP reply is a host networking problem.  Have you checked
host dmesg(1) output just in case there was a kernel message related
to this?

Stefan