[Bug 267028] kernel panics when booting with ZFS and amdgpu.ko (both are required)

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=267028

--- Comment #47 from George Mitchell <george@m5p.com> ---
Created attachment 239752
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=239752&action=edit
Latest crash dump

The last couple of crashes strongly resemble all the earlier ones, but they are
now less frequent with zfs.ko being loaded at /boot/loader.conf time and
amdgpu.ko loaded while booted into single user mode.  The difference (see
core.txt.2 from today's date) is that the backtrace line where modlist2_lookup
is called is now looking up vboxnetflt instead of zfs.  My rcorder list shows:

/etc/rc.d/dumpon
/etc/rc.d/sysctl
/etc/rc.d/natd
/etc/rc.d/dhclient
/etc/rc.d/hostid
/etc/rc.d/ddb
/etc/rc.d/ccd
/etc/rc.d/gbde
/etc/rc.d/geli
/etc/rc.d/zpool
/etc/rc.d/swap
/etc/rc.d/zfskeys
/etc/rc.d/fsck
/etc/rc.d/zvol
/etc/rc.d/growfs
/etc/rc.d/root
/etc/rc.d/sppp
/etc/rc.d/mdconfig
/etc/rc.d/hostid_save
/etc/rc.d/serial
/etc/rc.d/mountcritlocal
/etc/rc.d/zfsbe
/etc/rc.d/tmp
/etc/rc.d/zfs
/etc/rc.d/var
/etc/rc.d/cfumass
/etc/rc.d/cleanvar
/etc/rc.d/FILESYSTEMS
/etc/rc.d/geli2
/etc/rc.d/ldconfig
/etc/rc.d/kldxref
/etc/rc.d/adjkerntz
/etc/rc.d/hostname
/etc/rc.d/ip6addrctl
/etc/rc.d/ippool
/etc/rc.d/netoptions
/etc/rc.d/opensm
/etc/rc.d/random
/etc/rc.d/iovctl
/etc/rc.d/rctl
/usr/local/etc/rc.d/vboxnet
/etc/rc.d/ugidfw
/etc/rc.d/autounmountd
/etc/rc.d/mixer
/etc/rc.d/ipsec
/usr/local/etc/rc.d/uuidd
/etc/rc.d/kld
/etc/rc.d/ipfilter
/etc/rc.d/devmatch
/etc/rc.d/addswap
/etc/rc.d/ipnat
/etc/rc.d/ipmon
/etc/rc.d/ipfs
/etc/rc.d/netif
/etc/rc.d/ppp
/etc/rc.d/pfsync
/etc/rc.d/pflog
/etc/rc.d/rtsold
/etc/rc.d/static_ndp
/etc/rc.d/static_arp
/etc/rc.d/devd
/etc/rc.d/resolv
/etc/rc.d/stf
/etc/rc.d/ipfw
/etc/rc.d/routing
/etc/rc.d/bridge
/etc/rc.d/zfsd
/etc/rc.d/defaultroute
/etc/rc.d/routed
/etc/rc.d/pf
/etc/rc.d/route6d
/etc/rc.d/ipfw_netflow
/etc/rc.d/blacklistd
/etc/rc.d/netwait
/etc/rc.d/local_unbound
/etc/rc.d/NETWORKING
/etc/rc.d/kdc
/etc/rc.d/tlsservd
/etc/rc.d/iscsid
/etc/rc.d/pppoed
/etc/rc.d/ctld
/etc/rc.d/nfsuserd
/etc/rc.d/tlsclntd
/etc/rc.d/kfd
/usr/local/etc/rc.d/sndiod
/etc/rc.d/gssd
/etc/rc.d/nfscbd
/etc/rc.d/ipropd_master
/etc/rc.d/ipropd_slave
/etc/rc.d/kadmind
/etc/rc.d/kpasswdd
/etc/rc.d/iscsictl
/etc/rc.d/mountcritremote
/etc/rc.d/archdep
/etc/rc.d/dmesg
/etc/rc.d/wpa_supplicant
/etc/rc.d/hostapd
/etc/rc.d/accounting
/etc/rc.d/mdconfig2
/etc/rc.d/devfs
/etc/rc.d/gptboot
/etc/rc.d/virecover
/etc/rc.d/os-release
/etc/rc.d/motd
/etc/rc.d/cleartmp
/etc/rc.d/newsyslog
/etc/rc.d/syslogd
/etc/rc.d/linux
/etc/rc.d/sysvipc
/etc/rc.d/hastd
/etc/rc.d/localpkg
/etc/rc.d/auditd
/etc/rc.d/bsnmpd
/etc/rc.d/ntpdate
/etc/rc.d/watchdogd
/etc/rc.d/savecore
/etc/rc.d/pwcheck
/etc/rc.d/power_profile
/etc/rc.d/auditdistd
/etc/rc.d/SERVERS
/etc/rc.d/rpcbind
/etc/rc.d/nisdomain
/etc/rc.d/nfsclient
/etc/rc.d/ypserv
/etc/rc.d/ypupdated
/etc/rc.d/ypxfrd
/etc/rc.d/ypbind
/etc/rc.d/ypldap
/etc/rc.d/ypset
/etc/rc.d/keyserv
/etc/rc.d/automountd
/etc/rc.d/yppasswdd
/etc/rc.d/quota
/etc/rc.d/automount
/etc/rc.d/mountd
/etc/rc.d/nfsd
/etc/rc.d/statd
/etc/rc.d/lockd
/etc/rc.d/DAEMON
/etc/rc.d/rwho
/etc/rc.d/utx
/etc/rc.d/bootparams
/etc/rc.d/hcsecd
/etc/rc.d/ftp-proxy
/etc/rc.d/local
/usr/local/etc/rc.d/git_daemon
/etc/rc.d/lpd
/usr/local/etc/rc.d/dbus
/etc/rc.d/mountlate
/etc/rc.d/nscd
/etc/rc.d/ntpd
/etc/rc.d/powerd
/usr/local/etc/rc.d/slurmd
/usr/local/etc/rc.d/slurmctld
/etc/rc.d/ubthidhci
/etc/rc.d/rarpd
/etc/rc.d/sdpd
/etc/rc.d/apm
/etc/rc.d/rtadvd
/etc/rc.d/moused
/etc/rc.d/rfcomm_pppd_server
/usr/local/etc/rc.d/avahi-daemon
/etc/rc.d/swaplate
/etc/rc.d/bthidd
/etc/rc.d/bluetooth
/usr/local/etc/rc.d/avahi-dnsconfd
/etc/rc.d/LOGIN
/etc/rc.d/sshd
/usr/local/etc/rc.d/vboxheadless
/etc/rc.d/syscons
/etc/rc.d/sysctl_lastload
/usr/local/etc/rc.d/xdm
/usr/local/etc/rc.d/vboxwatchdog
/etc/rc.d/inetd
/usr/local/etc/rc.d/dnetc
/usr/local/etc/rc.d/munged
/etc/rc.d/sendmail
/etc/rc.d/ftpd
/usr/local/etc/rc.d/rsyncd
/usr/local/etc/rc.d/saned
/etc/rc.d/cron
/etc/rc.d/msgs
/etc/rc.d/othermta
/etc/rc.d/jail
/etc/rc.d/bgfsck
/usr/local/etc/rc.d/smartd
/etc/rc.d/securelevel

The vboxnetflt.ko module is loaded by /usr/local/etc/rc.d/vboxnet.

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