What happened?
On IBM PS/2 systems, Windows NT 4 will cause the emulator to crash when working with ESDI disks:

Additionally, on the Win32 UI, when fatal() is called, the entire emulator locks up and prevents you from clicking "exit", leaving you with no option but to force kill the emulator with taskkill.
Configuration file
[Machine]
machine = ibmps2_m80_type3
cpu_family = i486dx2_pc330
cpu_speed = 66666666
cpu_multi = 2
cpu_use_dynarec = 0
fpu_softfloat = 0
time_sync = local
fpu_type = internal
mem_size = 32768
[Video]
gfxcard = ibm1mbsvga
[Input devices]
mouse_type = ps2
[Sound]
fm_driver = nuked
sndcard = sb16_reply_mca
[Network]
net_01_link = 0
net_02_link = 0
net_03_link = 0
net_04_link = 0
net_01_card = wd8013epa
net_01_net_type = slirp
[Storage controllers]
hdc = esdi_mca
cassette_mode = load
scsicard_1 = spock
[Western Digital WD8013EP/A #1]
mac = 0c:07:93
[Hard disks]
hdd_01_parameters = 63, 16, 1024, 0, esdi
hdd_01_fn = ps2.img
hdd_01_speed = ramdisk
hdd_01_esdi_channel = 0
[Floppy and CD-ROM drives]
fdd_01_type = 35_2hd_ps2
fdd_01_turbo = 1
fdd_01_check_bpb = 0
fdd_02_type = none
cdrom_01_speed = 72
cdrom_01_parameters = 1, scsi
cdrom_01_scsi_location = 0:00
cdrom_01_host_drive = 200
cdrom_01_image_path = C:\Users\Kelsey\Documents\abandonware\Microsoft Windows NT 4.0 Workstation (4.00.1381.1.sp1)\winnt40wks_sp1_en.iso
cdrom_01_type = 86BOX_CD-ROM_1.00
[General]
vid_renderer = opengl_core
rctrl_is_lalt = 1
hide_tool_bar = 1
confirm_exit = 0
hide_status_bar = 1
Operating system
Win11 22631.2861
CPU
AMD Ryzen 9 7950X
86Box version
7f77fd4
Build architecture
Windows - x86 (32-bit)
Build type
Download source
I built 86Box myself (please tell us more about your build configuration)
Additional context
If NT4 is booted from a disk prepared from DOS beforehand rather than booting the installer from floppies, it will show a BSOD instead:

No modifications were made to the source.
Also, here are the NVR files and NT4 install floppies to make things easier:
nvr_and_setup_disks.zip
What happened?
On IBM PS/2 systems, Windows NT 4 will cause the emulator to crash when working with ESDI disks:

Additionally, on the Win32 UI, when
fatal()is called, the entire emulator locks up and prevents you from clicking "exit", leaving you with no option but to force kill the emulator with taskkill.Configuration file
Operating system
Win11 22631.2861
CPU
AMD Ryzen 9 7950X
86Box version
7f77fd4
Build architecture
Windows - x86 (32-bit)
Build type
Download source
I built 86Box myself (please tell us more about your build configuration)
Additional context
If NT4 is booted from a disk prepared from DOS beforehand rather than booting the installer from floppies, it will show a BSOD instead:

No modifications were made to the source.
Also, here are the NVR files and NT4 install floppies to make things easier:
nvr_and_setup_disks.zip