I finally squashed all of the bugs and got a clean run of device-crash-test with a full build of QEMU, over 182,000 individual test cases.
Here's all of the legitimate failures I saw:
CRITICAL: failed: binary=./qemu-system-x86_64 accel=kvm machine=none device=sgx-epc
CRITICAL: cmdline: ./qemu-system-x86_64 -S -machine none,accel=kvm -device sgx-epc
CRITICAL: log: /home/jsnow/src/qemu/include/hw/i386/pc.h:128:PC_MACHINE: Object 0x55b1c9dcad90 is not an instance of type generic-pc-machine
CRITICAL: exit code: -6
CRITICAL: failed: binary=./qemu-system-x86_64 accel=kvm machine=x-remote device=sgx-epc
CRITICAL: cmdline: ./qemu-system-x86_64 -S -machine x-remote,accel=kvm -device sgx-epc
CRITICAL: log: /home/jsnow/src/qemu/include/hw/i386/pc.h:128:PC_MACHINE: Object 0x559b43269d40 is not an instance of type generic-pc-machine
CRITICAL: exit code: -6
CRITICAL: failed: binary=./qemu-system-x86_64 accel=kvm machine=microvm device=sgx-epc
CRITICAL: cmdline: ./qemu-system-x86_64 -S -machine microvm,accel=kvm -device sgx-epc
CRITICAL: log: /home/jsnow/src/qemu/include/hw/i386/pc.h:128:PC_MACHINE: Object 0x55760ca941b0 is not an instance of type generic-pc-machine
CRITICAL: exit code: -6
CRITICAL: failed: binary=./qemu-system-x86_64 accel=tcg machine=none device=sgx-epc
CRITICAL: cmdline: ./qemu-system-x86_64 -S -machine none,accel=tcg -device sgx-epc
CRITICAL: log: /home/jsnow/src/qemu/include/hw/i386/pc.h:128:PC_MACHINE: Object 0x557a52333d90 is not an instance of type generic-pc-machine
CRITICAL: exit code: -6
CRITICAL: failed: binary=./qemu-system-x86_64 accel=tcg machine=x-remote device=sgx-epc
CRITICAL: cmdline: ./qemu-system-x86_64 -S -machine x-remote,accel=tcg -device sgx-epc
CRITICAL: log: /home/jsnow/src/qemu/include/hw/i386/pc.h:128:PC_MACHINE: Object 0x55bbcd596d40 is not an instance of type generic-pc-machine
CRITICAL: exit code: -6
CRITICAL: failed: binary=./qemu-system-x86_64 accel=tcg machine=microvm device=sgx-epc
CRITICAL: cmdline: ./qemu-system-x86_64 -S -machine microvm,accel=tcg -device sgx-epc
CRITICAL: log: /home/jsnow/src/qemu/include/hw/i386/pc.h:128:PC_MACHINE: Object 0x55ca35c081b0 is not an instance of type generic-pc-machine
CRITICAL: exit code: -6
CRITICAL: failed: binary=./qemu-system-mips64el accel=tcg machine=pica61 device=isa-cirrus-vga
CRITICAL: cmdline: ./qemu-system-mips64el -S -machine pica61,accel=tcg -device isa-cirrus-vga
CRITICAL: log: RAMBlock "vga.vram" already registered, abort!
CRITICAL: exit code: -6
CRITICAL: failed: binary=./qemu-system-i386 accel=kvm machine=none device=sgx-epc
CRITICAL: cmdline: ./qemu-system-i386 -S -machine none,accel=kvm -device sgx-epc
CRITICAL: log: /home/jsnow/src/qemu/include/hw/i386/pc.h:128:PC_MACHINE: Object 0x55d0e0a03d90 is not an instance of type generic-pc-machine
CRITICAL: exit code: -6
CRITICAL: failed: binary=./qemu-system-i386 accel=kvm machine=x-remote device=sgx-epc
CRITICAL: cmdline: ./qemu-system-i386 -S -machine x-remote,accel=kvm -device sgx-epc
CRITICAL: log: /home/jsnow/src/qemu/include/hw/i386/pc.h:128:PC_MACHINE: Object 0x564648250b30 is not an instance of type generic-pc-machine
CRITICAL: exit code: -6
CRITICAL: failed: binary=./qemu-system-i386 accel=kvm machine=microvm device=sgx-epc
CRITICAL: cmdline: ./qemu-system-i386 -S -machine microvm,accel=kvm -device sgx-epc
CRITICAL: log: /home/jsnow/src/qemu/include/hw/i386/pc.h:128:PC_MACHINE: Object 0x55bef7a235b0 is not an instance of type generic-pc-machine
CRITICAL: exit code: -6
CRITICAL: failed: binary=./qemu-system-i386 accel=tcg machine=none device=sgx-epc
CRITICAL: cmdline: ./qemu-system-i386 -S -machine none,accel=tcg -device sgx-epc
CRITICAL: log: /home/jsnow/src/qemu/include/hw/i386/pc.h:128:PC_MACHINE: Object 0x5608b9fecd90 is not an instance of type generic-pc-machine
CRITICAL: exit code: -6
CRITICAL: failed: binary=./qemu-system-i386 accel=tcg machine=x-remote device=sgx-epc
CRITICAL: cmdline: ./qemu-system-i386 -S -machine x-remote,accel=tcg -device sgx-epc
CRITICAL: log: /home/jsnow/src/qemu/include/hw/i386/pc.h:128:PC_MACHINE: Object 0x558306c9cb30 is not an instance of type generic-pc-machine
CRITICAL: exit code: -6
CRITICAL: failed: binary=./qemu-system-i386 accel=tcg machine=microvm device=sgx-epc
CRITICAL: cmdline: ./qemu-system-i386 -S -machine microvm,accel=tcg -device sgx-epc
CRITICAL: log: /home/jsnow/src/qemu/include/hw/i386/pc.h:128:PC_MACHINE: Object 0x55e041f465b0 is not an instance of type generic-pc-machine
CRITICAL: exit code: -6
CRITICAL: failed: binary=./qemu-system-mips64 accel=tcg machine=pica61 device=isa-cirrus-vga
CRITICAL: cmdline: ./qemu-system-mips64 -S -machine pica61,accel=tcg -device isa-cirrus-vga
CRITICAL: log: RAMBlock "vga.vram" already registered, abort!
CRITICAL: exit code: -6
--js