From owner-freebsd-hackers@FreeBSD.ORG  Thu Sep 25 23:06:01 2008
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From: Jeff Wheelhouse <freebsd-hackers@wheelhouse.org>
To: John Baldwin <jhb@freebsd.org>
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Subject: Re: panic: lockmgr on FreeBSD 7.0-RELEASE-p4 amd64
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On Sep 25, 2008, at 3:53 PM, John Baldwin wrote:
> You can use KTR instead of printf perhaps and then use 'show ktr'  
> from DDB.
> This won't have the same impact on timing as printf().  I would  
> include PIDs
> in any KTR traces you do so it's easier to parse the interleaved  
> entries from
> multiple CPUs.

OK, while I am educating myself about how KTR works, what would you  
like to see?  Just mp->mnt_vnodecovered?

>  Also, if you have a good test case, it might be worth
> grabbing a box w/o gmirror that can generate a crashdump and  
> reproduce it
> there.

Not an option for us right now; spare 8-core boxes are hard to come  
by.  We're looking for a USB hard drive or something we can dump to.

Thanks,
Jeff