[Bug 267187] System freeze on a T490 laptop

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=267187

            Bug ID: 267187
           Summary: System freeze on a T490 laptop
           Product: Base System
           Version: 13.1-RELEASE
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: bugs@FreeBSD.org
          Reporter: henrix@camandro.org

Some time ago I tried to migrate my laptop to FreeBSD. I've managed to install
13.0 and everything seemed to be fine, but then I started having these complete
system freezes. Since I was running X, I wasn't seeing anything on the console.
I didn't had too much time to investigate (and learn!), so I had to abort the
migration.

Today I tried to repeat the experiment with 13.1, on a Lenovo 13.1. The system
freeze happened again while doing the installation:

* I was configuring networking
* iwm(4) scan didn't returned any wireless networks
* plugged an ethernet cable to try to use the em(4) driver...
* the system stopped responding, the laptop started to get hotter and the fans
started

I had to hard-reboot, of course.

My question: I do I debug this? If I had to guess, it it's a network driver
bug, either iwm(4) or em(4), but how can I get more info when this happens? I
plan to try to re-install again without using the iwm(4) driver.

Another detail (probably irrelevant): I'm installing with encrypted
root-on-zfs.

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