$ timeout 20 /tmp/cxm_read_race
[-] open(/dev/cxm0): No such file or directory
[-] no cxm device on this machine (needs Conexant CX23415/CX23416 PCI card)
rc1=1

--- hardware-absence evidence (same guest session) ---
# ls -l /dev/cxm*            -> ls: /dev/cxm*: No such file or directory
# pciconf -l | grep -i "14f1|8800|8802" -> (no matches)
# kldstat | grep -i "cxm|drm|amdgpu|radeon" -> (no matches)
# uname -a
DragonFly dfbsd 6.5-DEVELOPMENT DragonFly 6.5-DEVELOPMENT #0: Thu Jul  2 06:02:54 UTC 2026  root@dfbsd:/usr/obj/usr/src/sys/X86_64_GENERIC  x86_64