uvm_fault(0xffffffff82bb1a08, 0x0, 0, 2) -> e
fatal page fault in supervisor mode
trap type 6 code 2 rip ffffffff81bae048 cs 8 rflags 10246 cr2 0 cpl a rsp ffff800021200e20
gsbase 0xffffffff829cbff0  kgsbase 0x0
panic: trap type 6, code=2, pc=ffffffff81bae048
Starting stack trace...
panic(ffffffff825a0cab) at panic+0x16b sys/kern/subr_prf.c:229
kerntrap(ffff800021200d70) at kerntrap+0x1c7 sys/arch/amd64/amd64/trap.c:327
alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b
km_free(0,1000,ffffffff82787f80,ffffffff82787f98) at km_free+0x118 sys/uvm/uvm_km.c:866
pool_p_free(ffffffff82ab7e10,fffffd807a0a2f90) at pool_p_free+0x14b sys/kern/subr_pool.c:1012
pool_gc_pages(0) at pool_gc_pages+0x255 sys/kern/subr_pool.c:1583
taskq_thread(ffffffff82936e60) at taskq_thread+0xe5 sys/kern/kern_task.c:449
end trace frame: 0x0, count: 250
End of stack trace.

dump to dev 4,1 not possible