Got this in bhyve VM on boot up and mount:

Starting file system checks:
/dev/vtbd0p3: clean, 1617700 free (222876 frags, 174353 blocks, 5.9% 

Fatal trap 18: integer divide fault while in kernel mode
cpuid = 1; apic id = 01
instruction pointer     = 0x20:0xffffffff80895d63
stack pointer           = 0x28:0xfffffe001eb5f220
frame pointer           = 0x28:0xfffffe001eb5f2b0
code segment            = base 0x0, limit 0xfffff, type 0x1b
                        = DPL 0, pres 1, long 1, def32 0, gran 1
processor eflags        = interrupt enabled, resume, IOPL = 0
current process         = 49 (mount)
[ thread pid 49 tid 100045 ]
Stopped at      softdep_slowdown+0x1d3: idivl   %ecx,%eax
db> bt
Tracing pid 49 tid 100045 td 0xfffff800026ee000
softdep_slowdown() at softdep_slowdown+0x1d3/frame 0xfffffe001eb5f2b0
ffs_truncate() at ffs_truncate+0x1be/frame 0xfffffe001eb5f640
ufs_setattr() at ufs_setattr+0x4e5/frame 0xfffffe001eb5f6a0
VOP_SETATTR_APV() at VOP_SETATTR_APV+0x22a/frame 0xfffffe001eb5f710
VOP_SETATTR() at VOP_SETATTR+0x45/frame 0xfffffe001eb5f760
vn_truncate() at vn_truncate+0x196/frame 0xfffffe001eb5f870
fo_truncate() at fo_truncate+0x41/frame 0xfffffe001eb5f8b0
kern_ftruncate() at kern_ftruncate+0x16d/frame 0xfffffe001eb5f920
sys_ftruncate() at sys_ftruncate+0x27/frame 0xfffffe001eb5f940
syscallenter() at syscallenter+0x46e/frame 0xfffffe001eb5f9b0
amd64_syscall() at amd64_syscall+0x1f/frame 0xfffffe001eb5fab0
Xfast_syscall() at Xfast_syscall+0xfb/frame 0xfffffe001eb5fab0
--- syscall (480, FreeBSD ELF64, sys_ftruncate), rip = 0x800b511fa, rsp = 
0x7fffffffe998, rbp = 0x7fffffffeb90 ---
db> call doadump
Dumping 60 out of 495 MB:..27%..54%..80%
Dump complete
= 0

I've got the core file.

Totus tuus, Glebius.
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