BTX halted

[John Baldwin]

On Monday, April 20, 2015 08:54:24 AM Karli Sjöberg wrote:
> Hey all!
> 
> I was just upgrading one of our storage's to 10-STABLE as per Bug
> 191348[*] when something strange happened after writing new boot code
> and rebooting:
> 
> BTX loader 1.00  BTX version is 1.02
> Consoles: internal video/keyboard
> BIOS drive C: is disk8
> BIOS drive D: is disk9
> 
> int=00000000  err=00000000  efl=00010246  eip=00037d34
> eax=00000001  ebx=00000000  ecx=00000000  edx=00000000
> esi=00000000  edi=00000000  ebp=0008f600  esp=0008f598
> cs=002b  ds=0033  es=0033    fs=0033  gs=0033  ss=0033
> cs:eip=f7 35 d0 f4 03 00 85 f6-74 05 89 3e 89 5e 04 89
>        c2 e9 cc 00 00 00 66 c7-45 ea 00 00 89 d8 c1 e8
> ss:esp=00 00 20 00 00 00 00 00-00 00 00 00 00 00 00 00
>        00 00 00 00 00 00 00 00-00 00 00 00 00 00 00 00
> BTX halted
> 
> Never happened to me before. I then booted with a 10.1-RELEASE CD and
> wrote bootcode from that, same problem. 9.3; same there...
> 
> Any pointers?

Hmm, looks like a divide-by-zero fault:

00000000  F735D0F40300      div dword [dword 0x3f4d0]
00000006  85F6              test esi,esi
00000008  7405              jz 0xf
0000000A  893E              mov [esi],edi
0000000C  895E04            mov [esi+0x4],ebx
0000000F  89C2              mov edx,eax
00000011  E9CC000000        jmp dword 0xe2
00000016  66C745EA0000      mov word [ebp-0x16],0x0
0000001C  89D8              mov eax,ebx

Are you using ZFS or UFS?  Also, do you have the world build from when you
did this?  If so we can use gdb on the 'loader.sym' file to map the faulting
instruction (eip above) to a source line.

-- 
John Baldwin