[Bug 217512] boot2 is unable to load kernel directly

[bugzilla-noreply at freebsd.org]

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=217512

            Bug ID: 217512
           Summary: boot2 is unable to load kernel directly
           Product: Base System
           Version: 11.0-RELEASE
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Many People
          Priority: ---
         Component: misc
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: mark at uncommon.com

Loading a kernel directly using boot2 causes the invalid-opcode fault like the
following:

int=00000006  err=00000000  efl=00010046  eip=c0300000
eax=002ff000  ebx=000213d0  ecx=00000000  edx=a030ff1e
esi=00018504  edi=0008eb78  ebp=0008ebc8  esp=0000940b
cs=0008  ds=0010  es=0010    fs=0010  gs=0010  ss=0010
cs:eip=ff ff ff ff ff ff ff ff-7f 00 00 00 00 00 00 00
       00 00 00 00 00 00 00 00-00 00 00 00 00 00 00 00
ss:esp=36 80 0d 07 90 00 00 01-e9 ba fc ff ff aa ac 84
       c0 0f 84 86 00 00 00 a8-80 74 f2 88 c5 b0 3d aa
BTX halted

This is using a GENERIC unmodified amd64 kernel (installed from HD from DVD iso
source (11p1) and trying /boot/kernel/kernel at boot: prompt. SAS/SATA drive
environment. Tested both MBR and GPTBOOT versions of boot2 (/boot/boot and
/boot/gptboot)-no joy.

/boot/loader works with no problem as well as just press [return] at the
prompt.

We need this feature to be working in our secure server environments (bypassing
the loader and directly booting a highly customized, self contained kernel).

RE: boot(8) man page, 'it is possible to dispense with the third stage
altogether'.  However, hitting a key and specifying '/boot/kernel/kernel'
results in hard stop (impossible to reboot with crtl-alt-del) after BTX halted
message--requires power cycle.  Booting '/boot/loader' works ok.

Thanks in advance.

-Mark

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