kern/57737: netbsd-10 panics on current Epyc CPU

[Hauke Fath <hf%spg.tu-darmstadt.de@localhost>]

>Number:         57737
>Category:       kern
>Synopsis:       netbsd-10 panics on current Epyc CPU
>Confidential:   no
>Severity:       critical
>Priority:       medium
>Responsible:    kern-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Fri Dec 01 11:20:00 +0000 2023
>Originator:     Hauke Fath
>Release:        NetBSD 10.0_RC1
>Organization:
Technische Universitaet Darmstadt
>Environment:
	
	
System: NetBSD 10.0_RC1 (GENERIC) #2: Thu Nov 30 13:28:34 CET 2023
Architecture: x86_64
Machine: amd64
>Description:

	netbsd-10 panics early on current multi-core Ryzen cpus.

	See the boot log for an Epyc 9554P cpu on a Gigabyte R263-Z70
	board at

	<ftp://oak.causeuse.org/pub/NetBSD/netbsd-10-GA_R263-Z70_epyc9554p.bootlog.gz>

	and the related discussion on current-users, where Martin
	suggested

	"That sounds like an fpu xsave size issue Taylor looked at
	recently (but it is not fixed)."

	
>How-To-Repeat:

	Boot netbsd-10 on a recent AMD Epyc system.
 
	
>Fix:
	Yes, please.  :)

	

>Unformatted: