[Bug 246413] boot from 12.1 DVD iso as MBR causes panic zfree wild pointer

[bugzilla-noreply at freebsd.org]

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=246413

            Bug ID: 246413
           Summary: boot from 12.1 DVD iso as MBR causes panic zfree wild
                    pointer
           Product: Base System
           Version: 12.1-RELEASE
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: kern
          Assignee: bugs at FreeBSD.org
          Reporter: jmillard at sprynet.com

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.

-- 
You are receiving this mail because:
You are the assignee for the bug.