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USB debugging (was: ktrace-ing a command that locks up the machine)

To: tech-kern%netbsd.org@localhost
Subject: USB debugging (was: ktrace-ing a command that locks up the machine)
From: Edgar Fuß <ef%math.uni-bonn.de@localhost>
Date: Wed, 18 Nov 2020 19:23:45 +0100

On Wed, Nov 18, 2020 at 09:05:47AM -0500, Greg Troxel wrote:
> another suggestion is to enable USB debugging in the kernel and use a serial 
> console (or even just framebuffer) to see the last message before crash.
I set options {USB,OHCI,EHCI}_DEBUG and sysctl -w hw.{usb,ohci,ehci}.debug=20 
and get zero output. What the hell am I missing?

References:
- ktrace-ing a command that locks up the machine
  - From: Edgar Fuß

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