[Bug 267028] kernel panics when booting with both (zfs,ko or vboxnetflt,ko or acpi_wmi.ko) and amdgpu.ko

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

--- Comment #93 from Mark Millard <marklmi26-fbsd@yahoo.com> ---
(In reply to Mark Millard from comment #92)

Looking at it some more and comparing to

#0 0xffffffff80c66ee5 at kdb_backtrace+0x65
#1 0xffffffff80c1bbef at vpanic+0x17f
#2 0xffffffff80c1ba63 at panic+0x43
#3 0xffffffff810addf5 at trap_fatal+0x385
#4 0xffffffff810ade4f at trap_pfault+0x4f
#5 0xffffffff81084fd8 at calltrap+0x8
#6 0xffffffff8214d251 at spl_nvlist_free+0x61
#7 0xffffffff8220d740 at fm_nvlist_destroy+0x20
#8 0xffffffff822e6e95 at zfs_zevent_post_cb+0x15
#9 0xffffffff8220cd02 at zfs_zevent_drain+0x62
#10 0xffffffff8220cbf8 at zfs_zevent_drain_all+0x58
#11 0xffffffff8220ede9 at fm_fini+0x19
#12 0xffffffff82243b94 at spa_fini+0x54
#13 0xffffffff822ee303 at zfs_kmod_fini+0x33
#14 0xffffffff8215fb3b at zfs_shutdown+0x2b
#15 0xffffffff80c1b76c at kern_reboot+0x3dc
#16 0xffffffff80c1b381 at sys_reboot+0x411
#17 0xffffffff810ae6ec at amd64_syscall+0x10c

both #27 and #28 in:

#26 amd64_syscall (td=0xfffffe000f43ca00, traced=0)
    at /usr/src/sys/amd64/amd64/trap.c:1185
#27 <signal handler called>
#28 0x00000000002881da in ?? ()
Backtrace stopped: Cannot access memory at address 0x7fffffffd688

are possibly just the normal difficulty with finding where
to stop listing.

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