Created attachment 199077 [details]
Core dump summary
I'm running 12.0-BETA3 but have experienced this issue with other versions of 11.2, stable/11, and 12-CURRENT.
Loading the nvidia-driver-340 and running startx will crash the machine every time. This is a 2010 Mac Mini and uniquely the graphics card shares system memory. I believe the Device ID is 0x08a4, and is listed as supported here: https://www.nvidia.com/object/IO_32667.html
I have tried loading the kernel extension via kldload, /etc/rc.conf, and /boot/loader.conf, and building with ports.
Configuration details are:
pciconf -lv | grep display -B 3 -A 1
vgapci0@pci0:5:0:0: class=0x030000 card=0x00c0106b chip=0x08a410de rev=0xa2 hdr=0x00
vendor = 'NVIDIA Corporation'
device = 'MCP89 [GeForce 320M]'
class = display
subclass = VGA
A core dump summary is attached.