Re: Heads up: New WITNESS output

In reply to: Jonathan T. Looney: "Heads up: New WITNESS output"
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From: Zhenlei Huang <zlei_at_FreeBSD.org>
Date: Tue, 27 Jan 2026 03:39:26 UTC


> On Jan 27, 2026, at 4:33 AM, Jonathan T. Looney <jtl@freebsd.org> wrote:
> 
> Hi Folks,
> 
> As a heads-up, I just committed a change to the WITNESS output. It will now print more detailed information when a lock ordering was established through a chain of locks (e.g. lock1 is locked before lock2, lock2 is locked before lock3; therefore, locking lock3 before lock1 is a LOR).
> 
> An example of the new output is in the review request (https://reviews.freebsd.org/D54785 <https://reviews.freebsd.org/D54785>).
> 
> If you want to restore the old behavior, you can set the debug.witness.trace sysctl/tunable to 1.
> 
> In the meantime, please let me know if you run into any trouble with the new functionality.
> 
> Jonathan

Hi Jonathan,

That is a nice feature. I have been confused by the LOR report for many times. Thanks for your work !

Best regards,
Zhenlei