freebsd stable - Jan 2021 - FreeBSD 12.2p1 won't boot on (some) Dell R730xd

I have two Dell R730xd. they have different generation Intel CPU
cards, one has the 8 core, the other the 6 core, duals (so 16 and 12
respectively)

same disk controller (HBA) same memory.

One booted 12.2p1 just fine. The other just won't do it. Bootloops
hard during device probe time.

I played with x2APIC and the behaviour changed, but it hung badly in
USB timeouts.

FreeBSD 13-snapshot boots fine btw. As does FreeBSD 12.1 and priors.

UEFI, BIOS, same-same.

Any clues? Its not important to me, but, if debug is useful to anyone,
PM will find me and I can try things you direct.

-G

On Thu, Jan 21, 2021 at 03:21:57PM +1000, George Michaelson
wrote:
> I have two Dell R730xd. they have different generation Intel CPU
> cards, one has the 8 core, the other the 6 core, duals (so 16 and 12
> respectively)
> 
> same disk controller (HBA) same memory.
> 
> One booted 12.2p1 just fine. The other just won't do it. Bootloops
> hard during device probe time.
> 
> I played with x2APIC and the behaviour changed, but it hung badly in
> USB timeouts.
> 
> FreeBSD 13-snapshot boots fine btw. As does FreeBSD 12.1 and priors.
> 
> UEFI, BIOS, same-same.
> 
> Any clues? Its not important to me, but, if debug is useful to anyone,
> PM will find me and I can try things you direct.
> 
You are probably falling into PR251483. Please take a look at:
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=251483

-- 
Marek Zarychta
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