From: "Theo de Raadt" <deraadt@openbsd.org>
Subject: Re: another yubikey diff
To: Miod Vallat <miod@online.fr>
Cc: Mike Larkin <mlarkin@nested.page>, Brandon Mercer <bmercer@eutonian.com>, Mark Kettenis <mark.kettenis@xs4all.nl>, tech@openbsd.org
Date: Fri, 22 Aug 2025 11:19:01 -0600

Miod Vallat <miod@online.fr> wrote:

> > hotplug creates events when devices match.  This is before the attach
> > functions have completed.  If hotplug tries to play with a device, and the
> > attach routine encounters extended sleeps, the hotplug action will not
> > succeed.
> 
> Are you sure about that? Looking at subr_autoconf.c,
> hotplug_device_attach() only gets invoked after the device attach
> routine has returned.

Then maybe it is deferred actions that screw things up.

We've heard numerous cases of hotplug not behaving like people expect.