kern/57696: NetBSD-10.0_RC1-amd64-install.img.gz kernel panics at reboot or shutdown on mid 2010 21.5" iMac

[JMoyer%NODOMAIN.NET@localhost]

>Number:         57696
>Category:       kern
>Synopsis:       NetBSD-10.0_RC1-amd64-install.img.gz kernel panics at reboot or shutdown on mid 2010 21.5" iMac
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    kern-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Mon Nov 13 07:10:00 +0000 2023
>Originator:     Josh Moyer
>Release:        10_RC1
>Organization:
NODOMAIN.NET
>Environment:
NetBSD  10.0_RC1 NetBSD 10.0_RC1 (GENERIC) #0: Sun Nov  5 18:30:08 UTC 2023  mkrepro%mkrepro.NetBSD.org@localhost:/usr/src/sys/arch/amd64/compile/GENERIC amd64
>Description:
NetBSD-10.0_RC1-amd64-install.img.gz kernel crashes at reboot or shutdown on mid 2010 21.5" iMac

kernel: page fault trap, code=0
Stopped in pid 172.172 (reboot) at      netbsd:usb_pci_rem+0x29        movq %rdx,0(%rax)
usb_pci_rem() at netbsd:usb_pci_rem+0x29
config_detach() at netbsd:config_detach+0xfc
config_detach_all() at netbsd:config_detach_all+0xc8
cpu_reboot() at netbsd:cpu_reboot+0x1c0
kern_reboot() at netbsd:kern_reboot+0x6c
sys_reboot() at netbsd:sys_reboot+0x63
syscall() at netbsd:syscall+0x1fc
--- syscall (number 208) ---

Note: I tried to analyze this panic (netbsd.4.core -- for my reference) per the panic wiki with gdb, crash and addr2line, but all three seem broken, sadly.

Note: The system -- once installed -- does not have any trouble rebooting. (Shutdown is a different story/bug.)

Note: I diff'd the image and installed kernel and they were identical, so, perhaps something related to booting off the SD card?

Note: This problem did not repro on a vmware virtual machine booted off the same SD card -- albeit with a USB sd reader.
>How-To-Repeat:
Boot from NetBSD-10.0_RC1-amd64-install.img.gz on a mid 2010 21.5" iMac then reboot or shutdown the machine. 100% repro on my system.

Note: Booted the image from an 8GB microSD card w/the built-in SD card slot and a microSD to SD adapter.
>Fix:
N/A