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From: John Baldwin <jhb@freebsd.org>
To: freebsd-fs@freebsd.org
Subject: Re: BTX halted
Date: Fri, 07 Aug 2015 12:29:07 -0700
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On Monday, April 20, 2015 08:54:24 AM Karli Sj=F6berg wrote:
> Hey all!
>=20
> 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:
>=20
> BTX loader 1.00  BTX version is 1.02
> Consoles: internal video/keyboard
> BIOS drive C: is disk8
> BIOS drive D: is disk9
>=20
> int=3D00000000  err=3D00000000  efl=3D00010246  eip=3D00037d34
> eax=3D00000001  ebx=3D00000000  ecx=3D00000000  edx=3D00000000
> esi=3D00000000  edi=3D00000000  ebp=3D0008f600  esp=3D0008f598
> cs=3D002b  ds=3D0033  es=3D0033    fs=3D0033  gs=3D0033  ss=3D0033
> cs:eip=3Df7 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=3D00 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
>=20
> 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...
>=20
> 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 fau=
lting
instruction (eip above) to a source line.

--=20
John Baldwin