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: [email protected]
Reporter: [email protected]
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.
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