Host is Windows 7 x64 SP1.
CPU is Core i7 960.
Hypervisor is VirtualBox 6.0.6.
VM is using UEFI.
Kernel config is 
https://ximalas.info/~trond/create-zfs/canmount/VBOXGUEST-amd64-head 

Crash happens early during boot, right after launching the APs.

fault virtual address   = 0x0
[...]
KDB backtrace:
db_trace_self_wrapper() at
vpanic() at
panic() at
trap_fatal() at
trap_pfault() at
trap() at
calltrap() at
-- trap 0xc, rip = 0xffffffff8196d63a, rsp = 0xffffffff8198d730, rbp = 
0xffffffff8198d790 ---
fbt_provide_module_function() at 0xffffffff8196d63a = 
fbt_provide_module_function+0x7a/frame 0xffffffff8198d790
link_elf_each_function_nameval() at 0xffffffff80822ae5 = 
link_elf_each_function_nameval+0x115/frame 0xffffffff8198d7e0
fbt_provide_module() at 0xffffffff8196c33e = fbt_provide_module+0xde/frame 
0xffffffff8198dc10
fbt_linker_file_cb() at 0xffffffff8196c242 = fbt_linker_file_cb+0x12/frame 
0xffffffff8198dc20
linker_file_foreach() at 0xffffffff807c47b7 = linker_file_foreach+0x67/frame 
0xffffffff8198dc60
mi_startup() at 0xffffffff80786de6 = mi_startup+0x216/frame 0xffffffff8198dcb0
btext() at 0xffffffff8030da2c = btext+0x2c
Uptime: 1s

Previous BE is r346969 and works flawlessly.
No dumpdev is enabled to capture the details this early during boot.
Suggestions are welcome.

-- 
Trond.
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