This is related to 242106. My W520 lenovo thinkpad tries MBR boot before UEFI boot from DVD. Booting as MBR causes the panic. If I change the BIOS to try UEFI before MBR it works fine. The workaround for 242106 is to tell the VM to boot UEFI first. The text of the panic is: CD Loader 1.2 Building the boot loader arguments Looking up /BOOT/LOADER... found Relocating the loader and BTX Starting the BTX loader BTX loader 1.00 BTX version is 1.02 Consoles: internal video/keyboard BIOS CD is cd0 BIOS drive C: is disk0 BIOS 630kb/3125884kb available memory FreeBSD/x86 bootstrap loader, Revision 1.1 panic: zfree(90xbd69c6b0,8224): wild pointer --> Press a key on the console to reboot <-- I reproduced this with disk and dvd ISO's The code should probably sanity check the startup environment. This is not high priority as the work-around is easy. This bug will serve to document the problem and the work-around.
^Triage: I'm sorry that this PR did not get addressed in a timely fashion. By now, the version that it was created against is long out of suppoprt. Please re-open if it is still a problem on a supported version.