Re: kern/59185: panic over KASSERTMSG(dev->ud_ifaces == NULL) on Dell Latitude 7490

To: "Emile `iMil' Heitor" <imil%home.imil.net@localhost>, Emmanuel Nyarko <emmankoko519%gmail.com@localhost>, Salil Wadnerkar <bsdprg%tuta.io@localhost>
Subject: Re: kern/59185: panic over KASSERTMSG(dev->ud_ifaces == NULL) on Dell Latitude 7490
From: Taylor R Campbell <riastradh%NetBSD.org@localhost>
Date: Sat, 4 Oct 2025 19:03:59 +0000

Can you please try the attached patch and see if it helps?

I suspect this is the same issue as:

PR kern/59624: Booting NetBSD-11 from USB on my Dell machine panics
and hangs
https://gnats.NetBSD.org/59624

PR kern/57447: HEAD fails to probe USB devices and fails to boot up
https://gnats.NetBSD.org/57447

syzbot: UBSan: Undefined Behavior in usb_free_device (2)
https://syzkaller.appspot.com/bug?id=e6d4449a128e73a9a88100a5cc833e5cae9fecae

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