illegal instruction in kernel at boot

[Manuel Bouyer <bouyer%antioche.eu.org@localhost>]

Hello
I tried booting the latest netbsd-10 image on a brand new Poweredge
R750 server with 2 Intel(R) Xeon(R) Silver 4310 CPU (Model 106 Stepping 6).
It panics with:
[   1.0077245] fatal privileged instruction fault in supervisor mode
[   1.0077245] trap type 0 code 0 rip 0xffffffff8023c25e cs 0x8 rflags 0x10246 cr2 0 ilevel 0x6 rsp 0xffffffff81d4eab8
[   1.0077245] curlwp 0xffffffff8188ad00 pid 0.0 lowest kstack 0xffffffff81d492c0
kernel: privileged instruction fault trap, code=0
Stopped in pid 0.0 (system) at  netbsd:xrstor+0xa:      fxsavel
xrstor() at netbsd:xrstor+0xa
aes_selftest() at netbsd:aes_selftest+0x26
aes_modcmd() at netbsd:aes_modcmd+0xe9
module_do_builtin() at netbsd:module_do_builtin+0x142
module_do_builtin() at netbsd:module_do_builtin+0xfa
module_init_class() at netbsd:module_init_class+0x142
main() at netbsd:main+0x493
ds          5510
es          bd41
fs          bd41
gs          ab9f
rdi         ffffffff81007d80    safe_fpu.1
rsi         2e7
rbp         ffffffff81d4eb00
rbx         ffffffff8130fb48    C.7+0x48
rdx         0
rcx         70
rax         2e7
r8          70
r9          ffffffff81d4eb10
r10         0
r11         0
r12         ffffffff818493e0    aes_ni_impl
r13         20
r14         3c
r15         0
rip         ffffffff8023c25e    xrstor+0xa
cs          8
rflags      10246
rsp         ffffffff81d4eab8
ss          10
netbsd:xrstor+0xa:      fxsavel

It looks like we're using aes_ni_impl:
db{0}> x/qx aes_md_impl
netbsd:aes_md_impl:     ffffffff818493e0
db{0}> x/x ffffffff818493e0
netbsd:aes_ni_impl:     8141a421
db{0}> x/i xrstor
netbsd:xrstor:  movq    %rsi,%rax
db{0}> 
netbsd:xrstor+0x3:      movq    %rsi,%rdx
db{0}> 
netbsd:xrstor+0x6:      shrq    $0x20,%rdx
db{0}> 
netbsd:xrstor+0xa:      fxsavel
db{0}> 
netbsd:xrstor+0xd:      ret

But I didn't find what in aes_selftest could call xrstor
Any idea ?

-- 
Manuel Bouyer <bouyer%antioche.eu.org@localhost>
     NetBSD: 26 ans d'experience feront toujours la difference
--