netstat fails with memory allocation error and error in kvm_read

[Max Laier]

On Wednesday 05 January 2005 18:26, J. Martin Petersen wrote:
> > I just got another "netstat: kvm_read: Bad address".
> > vm.kvm_free was 675278848 two seconds earlier and a couple of
> > seconds later (and also currently).
>
> We just had another hard hang, and this time I managed to break to the
> debugger on the serial console. I got this stack trace
> <http://www.aub.dk/~jmp/fw/trace>, which seems to indicate that pf is
> messing up somehow.

This looks like pf.c, rev. 1.25 (HEAD) 1.18.2.6 (RELENG_5) and is an endless 
loop, not a deadlock. I hope you can verify that updating to these revisions 
solves the issue. Please get back to me if not. Thanks in advance.

> I of course didn't have the ddb man or the handbook section on kernel
> debugging at hand, so I've just printed it for the next time it happens.
>
> Both 'show witness' and 'show locks' came up empty. What's the most
> effective way to hunt down these deadlocks with the online kernel debugger?


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