[Bug 268157] /etc/rc.d/zpool runs too early, before usb disks available

From: <bugzilla-noreply_at_freebsd.org>
Date: Mon, 05 Dec 2022 05:32:16 UTC

Graham Perrin <grahamperrin@freebsd.org> changed:

           What    |Removed                     |Added
           Assignee|freebsd-arm@FreeBSD.org     |usb@FreeBSD.org
           Hardware|arm64                       |Any

--- Comment #4 from Graham Perrin <grahamperrin@freebsd.org> ---
Thanks, now I might have a clearer idea of what you're describing. 

(In reply to Barney Wolff from comment #3)

> … a vital pool that's on a permanently-attached internal disk 
> fails to get imported because an unimportant pool on a usb disk has 
> vanished.

For me, occasionally, boot (from OpenZFS on adao) fails in the presence of some
combination of external USB devices. IIRC multi-user mode either (a) is not
reached, or (b) does not progress. 

The 'offending' device is not necessarily one that contains a pool. Sometimes
it might be a cache device; other times IIRC it might be not storage-related.
Sometimes, randomness – a failure to boot with a particular set of USB devices
might be followed by a successful boot with the same set, with no change to
connections. When the bug bites: I remove the device, boot continues. There
might be an existing bug report for this type of thing.

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