Re: Panic on boot on Lenovo ThinkCentre, before copyright message appears [SOLVED]

For the archives...

Booting in verbose mode yielded no additional messages, which meant the 
panic was occurring before the SMAP messages are normally printed. This 
narrowed the problem area considerably. In the end it seems that the 
memory detection triggers an unimplemented or mis-implemented int12 in 
the BIOS - I was able to work around it by setting the following loader 
tunable:

     set hw.hasbrokenint12=1

at the loader prompt, allowed the machine to boot without issue. I 
subsequently adding this to /boot/loader.conf to persist across reboots:

     hw.hasbrokenint12="1"

Hopefully this helps anyone who has similar problems in the future.

A big thank you to gavin_at_ who helped in tracking the solution.

-- Antony

Antony Mawer wrote:
> I've been having trouble getting 6.x, 7.x and 8.0 to boot on a Lenovo 
> ThinkCentre M-series, model 6081 AG1. The system panics on boot, what 
> seems to be as soon as it goes to boot the kernel (it loads the kernel 
> and modules like acpi.ko fine)...
> 
> System is running the latest BIOS (2KRT50AUS) from 22 July 2008; we have 
> successfully booted Windows and Linux on the same system, and it has 
> survived several hours of memtest'ing.
> 
> The panic (manually transcribed, so I hope I haven't made any typos) as 
> seen from the 200807/i386 snapshot CD:
> 
> 
> /boot/kernel/acpi.ko text=0x54624 data=0x2640+0x182c 
> syms=0x4+0x8b70+0x4+0xbe09]
> GDB: no debug ports present
> KDB: debugger backends: ddb
> KDB: current backend: ddb
> 
> 
> 
> Fatal trap 12: page fault while in kernel mode
> cpuid = 0; apic id = 00
> fatal virtual address   = 0xf000ff53
> fault code              = supervisor read, page not present
> instruction pointer     = 0x20:0xf000ff53
> stack pointer           = 0x28:0xc1421f0c
> frame pointer           = 0x28:0xc1421f9c
> code segment            = base 0x0, limit 0xfffff, type 0x1b
>                         = DPL 0, pres 1, def32 1, gran 1
> processor eflags        = interrupt enabled, resume, IOPL = 0
> current process         = 0 ()
> [thread pid 0 tid 0 ]
> Stopped at      0xf000ff53:     *** error reading from address f000ff53 ***
> db> bt
> Tracing pid 0 tid 0 td 0xc0c837c0
> trap(c1421fa8) at trap+0x66f
> calltrap() at calltrap+0x6
> --- trap 0x9, eip = 0x3fbb, esp = 0xfd2, ebp = 0 ---
> db> sh reg
> cs                0x20
> ds                0x28
> es                0x28
> fs                 0x8
> ss                0x28
> eax         0xf000ff53
> ecx                0x9
> edx                0xa
> ebx                0x9
> esp         0xc1421f0c
> ebp         0xc1421f9c
> esi         0xc1421fa8
> edi         0xc0c837c0   thread0
> eip         0xf000ff53
> efl            0x10286
> 0xf000ff53:     *** error reading from address f000ff53 ***
> db>
> 
> 
> 
> Is there any additional information I can provide from the DDB prompt 
> that may help tracking down why this machine is unable to boot (I have 
> included the output from backtrace above, but it does not appear to help 
> much...)?
> 
> Cheers
> Antony
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