I forgot to add stack info # mdb -e "::stack" core.bhyve.19979 libc.so.1`_lwp_kill+0xa() libc.so.1`raise+0x22(6) libc.so.1`abort+0x58() 0xfffffc7feeef6d82() pci_viona_write+0x4d1(f19050, 0, e, 2, 3) pci_emul_io_handler+0xa7(f091b0, 0, 210e, 2, fffffc7fe95f5e4c, f19050) emulate_inout+0x90(f091b0, f0ffb0, fffffc7fe95f5e4c) vmexit_inout+0x65(f091b0, f0ffb0, fffffc7fe95f5ee0) vm_loop+0x9f(f091b0, f0ffb0) fbsdrun_start_thread+0x59(f10f90) libc.so.1`_thrp_setup+0x77(fffffc7fef221240) libc.so.1`_lwp_start()
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