[Bug 262690] "driver bug: Unable to set devclass" for atrtc

From: <bugzilla-noreply_at_freebsd.org>
Date: Sun, 20 Mar 2022 19:20:19 UTC 
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=262690

            Bug ID: 262690
           Summary: "driver bug: Unable to set devclass" for atrtc
           Product: Base System
           Version: 13.0-STABLE
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: bugs@FreeBSD.org
          Reporter: jfc@mit.edu

At boot my kernel reports

driver bug: Unable to set devclass (class: atrtc devname: (unknown))

device_set_devclass is returning 17 (EEXIST).  According to my old system logs
this started showing up in December 2020 when I upgraded from

FreeBSD 13.0-CURRENT #0 r366363: Fri Oct  2 13:36:14 EDT 2020

to

FreeBSD 13.0-CURRENT #0 r368445: Tue Dec  8 11:52:41 EST 2020

My hardware is an HPE ProLiant DL325 with a single AMD EPYC 7402P 24 core CPU.

Surrounding context is

intsmb0: <AMD FCH SMBus Controller> at device 20.0 numa-domain 0 on pci15
smbus0: <System Management Bus> numa-domain 0 on intsmb0
driver bug: Unable to set devclass (class: atrtc devname: (unknown))
acpi_wmi0: <ACPI-WMI mapping> on acpi0
acpi_wmi0: cannot find EC device
lo0: link state changed to UP

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