Boot failures with 14.0-ALPHA1 and 14.0-ALPHA2

On 18/08/2023 13:21, Graham Perrin wrote:
> I'll update to ALPHA2.

Another failure.

In this case, removal of a USB device was unnecessary; the next start 
succeeded.

% bectl list -c creation | grep edacf4b4824a
n264868-edacf4b4824a-a NR     /          460G  2023-08-19 03:54
n264868-edacf4b4824a-b -      -          52.1M 2023-08-20 20:20
% uname -aKU
FreeBSD mowa219-gjp4-8570p-freebsd 14.0-ALPHA2 FreeBSD 14.0-ALPHA2 amd64 
1400094 #4 main-n264868-edacf4b4824a-dirty: Fri Aug 18 23:46:09 BST 2023 
grahamperrin@mowa219-gjp4-8570p-freebsd:/usr/obj/usr/src/amd64.a
md64/sys/GENERIC amd64 1400094 1400094
%

> In the meantime, briefly: <https://photos.app.goo.gl/jcXxDuxWPyXTa59Z8>
>
> – no visible progress beyond the four lines of EFI framebuffer 
> information.
>
> In each case, I worked around by removing a USB flash drive that's 
> used for L2ARC.
>
> The most recent incident was preceded by a power button shutdown, in 
> response to a drm-510-kmod blackout (GPU lockup etc.) whilst typing in 
> Firefox (comparable to 
> <https://github.com/freebsd/drm-kmod/issues/239> for drm-515-kmod 
> 5.15.25).
>
> The prior incident was also preceded by a power button shutdown (in 
> response to a blackout at Plasma log out time). This was remarkable in 
> that there was an unexpected restart, when I expected the computer to 
> power off.
>