syzbot

[   1.0438096] fatal page fault in supervisor mode
[   1.0438096] trap type 6 code 0 rip 0xffffffff83db4d09 cs 0x8 rflags 0x10246 cr2 0xffff8c8010b20000 ilevel 0x8 rsp 0xffffffff870a93b0
[   1.0438096] curlwp 0xffffffff86742ac0 pid 0.0 lowest kstack 0xffffffff870a42c0
kernel: page fault trap, code=0
Stopped in pid 0.0 (system) at  netbsd:virtio_free_vq+0xad:     movq    0(%r12),
%r12
virtio_free_vq() at netbsd:virtio_free_vq+0xad sys/dev/pci/virtio.c:906
vioscsi_attach() at netbsd:vioscsi_attach+0x4e6 sys/dev/pci/vioscsi.c:209
config_attach_internal() at netbsd:config_attach_internal+0x4d6 sys/kern/subr_autoconf.c:1785
config_found() at netbsd:config_found+0x354 sys/kern/subr_autoconf.c:1272
virtio_pci_rescan() at netbsd:virtio_pci_rescan+0x8e sys/dev/pci/virtio_pci.c:318
virtio_pci_attach() at netbsd:virtio_pci_attach+0x459 sys/dev/pci/virtio_pci.c:299
config_attach_internal() at netbsd:config_attach_internal+0x4d6 sys/kern/subr_autoconf.c:1785
config_found() at netbsd:config_found+0x354 sys/kern/subr_autoconf.c:1272
pci_probe_device() at netbsd:pci_probe_device+0xec9 sys/dev/pci/pci.c:488
pci_enumerate_bus() at netbsd:pci_enumerate_bus+0x481 sys/dev/pci/pci.c:819
pcirescan() at netbsd:pcirescan+0x75 sys/dev/pci/pci.c:113
pciattach() at netbsd:pciattach+0x50f sys/dev/pci/pci.c:210
config_attach_internal() at netbsd:config_attach_internal+0x4d6 sys/kern/subr_autoconf.c:1785
config_found() at netbsd:config_found+0x354 sys/kern/subr_autoconf.c:1272
mp_pci_scan() at netbsd:mp_pci_scan+0x1d6 sys/arch/x86/x86/mp.c:96
amd64_mainbus_attach() at netbsd:amd64_mainbus_attach+0x467 sys/arch/amd64/amd64/amd64_mainbus.c:213
config_attach_internal() at netbsd:config_attach_internal+0x4d6 sys/kern/subr_autoconf.c:1785
config_rootfound() at netbsd:config_rootfound+0x92 config_attach sys/kern/subr_autoconf.c:1820 [inline]
config_rootfound() at netbsd:config_rootfound+0x92 sys/kern/subr_autoconf.c:1300
cpu_configure() at netbsd:cpu_configure+0x58 sys/arch/amd64/amd64/autoconf.c:112
main() at netbsd:main+0x452 sys/kern/init_main.c:555
--db_more--