Re: Panic during boot (in_arpinput).


On Wed, 15 Nov 2006, Ian FREISLICH wrote:

Robert Watson wrote:
On Wed, 15 Nov 2006, Ian FREISLICH wrote:

Ian FREISLICH wrote:

I have 2 servers each with 255 vlan interfaces and carp interfaces in each vlan.During the boot up while it's configuring the interfaces, it reliably panics. It boots fine if no network cables are plugged in (and in the test evironment on a quient lan).

It's an SMP machine. My guess (from the panic message below) is that an arp query arives on an interface it's in the middle of creating or something like that (highly unsophisticated debugging conjecture).

In the mean time I'm going to try a UP kernel and see if that masks the problem.

FWIW, a UP kernel has the same problem.

What happens if you disable PREEMPTION on UP and try the same thing again?

Same thing.

If I don't assign the carp interfaces a vhid and pass at boot time, it boots up OK, but I need the carp interfaces. I can arrange serial console access. I have a similar system from ~"Tue Aug 29 09:47:50 SAST 2006" that works, but I suspect it may suffer the same problem. I'm about to test this.

This suggests that it is not the race I was worried it was, which is really good news :-). This makes me suspect a CARP-specific bug as opposed to the wider issue of under-synchronization of the address lists.

Robert N M Watson
Computer Laboratory
University of Cambridge
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