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

[Taylor R Campbell <riastradh%NetBSD.org@localhost>]

Can you share dmesg?  Maybe dmesg with `boot -v -x'?

Looks like the failed attach path in ohci(4) and uhci(4) won't put the
device on the usb_pci list, which breaks detach because detach assumes
it is on the list.

That said, I'm not sure why we set DVF_DETACH_SHUTDOWN for ohci(4) and
uhci(4) in the first place to make them detach on shutdown; it was set
by dyoung@ in 2009 with a commit message that doesn't say anything
about why the change was made.  dyoung: Do you remember anything?

We can fix the interaction of failed attach with detach, or we can
remove DVF_DETACH_SHUTDOWN, but there's probably an underlying problem
on attach that the dmesg will provide hints about, and that's what we
should really try to fix.