Panic booting 12-RC2 on amd64

[Christian Ullrich]

Hello,

I have a reproducible panic booting 12-RC2 and stable/12, 2cf4a7e0d8 
from Friday, on a Jetway JNF9HG board, Celeron N2930 CPU, booting with 
UEFI. The same box has no problems with stable/11 18f83cbbc9 from Thursday.

There is no serial console on the box right now, but the last screenful 
of boot output is this (from the -RC2; the panic'ing symbol is the same 
with the stable/12 kernel):

random: entropy device external interface
kbd1 at kbdmux0
netmap: loaded module
[ath_hal] loaded
module_register_init: MOD_LOAD (vesa, 0xffffffff810f8750, 0) error 19
random: registering fast source Intel Secure Key RNG
random: fast provider: "Intel Secure Key RNG"
nexus0
kernel trap 12 with interrupts disabled
kernel trap 12 with interrupts disabled
cryptosoft0: <software crypto> on motherboard
acpi0: <_> on motherboard
panic: smp_targeted_tlb_shootdown: interrupts disabled
cpuid = 2
time = 1
KDB: stack backtrace:
#0 0xffffffff80be74a7 at kdb_backtrace+0x67
#1 0xffffffff80b9b093 at vpanic+0x1a3
#2 0xffffffff80b9aee3 at panic+0x43
#3 0xffffffff811eda2f at smp_targeted_tlb_shootdown+0x40f
#4 0xffffffff811ed60d at smp_masked_invltlb+0x3d
#5 0xffffffff8105d5c5 at pmap_invalidate_range+0x1b5
#6 0xffffffff8106a429 at pmap_change_attr_locked+0x859
#7 0xffffffff81069804 at pmap_mapdev_internal+0x424
#8 0xffffffff81075ed0 at pcie_cfgregopen+0x60
#9 0xffffffff80451f10 at acpi_attach+0x390
#10 0xffffffff80bd6efc at device_attach+0x3ec
#11 0xffffffff80bd81dc at bus_generic_attach+0x5c
#12 0xffffffff80bd6efc at device_attach+0x3ec  [sic!]
#13 0xffffffff80bd88b8 at bus_generic_new_pass+0x118
#14 0xffffffff80bda577 at root_bus_configure+0x77
#15 0xffffffff811dbce9 at configure+0x9
#16 0xffffffff80b31a78 at mi_startup+0x118
#17 0xffffffff8034102c at btext+0x2c
Uptime: 1s
Automatic reboot in 15 seconds - press a key on the console to abort

If it matters, the build from svn was with CPUTYPE=slm, the -RC2 is 
FreeBSD-12.0-RC2-amd64-mini-memstick.img, i.e. without CPUTYPE. I have 
been running stable/11 with CPUTYPE=slm on this and other identical CPUs 
for a long time with no trouble, so I think it is unrelated.

I'd really like to upgrade to 12. If anyone can suggest something I can 
try, I'll be happy to do experiments.

-- 
Christian