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[Xen-bugs] [Bug 881] New: Disk/FS corruption

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Subject: [Xen-bugs] [Bug 881] New: Disk/FS corruption
From: bugzilla-daemon@xxxxxxxxxxxxxxxxxxx
Date: Sun, 4 Feb 2007 07:19:18 -0800
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http://bugzilla.xensource.com/bugzilla/show_bug.cgi?id=881

           Summary: Disk/FS corruption
           Product: Xen
           Version: unstable
          Platform: x86
        OS/Version: Linux
            Status: NEW
          Severity: critical
          Priority: P2
         Component: HVM
        AssignedTo: xen-bugs@xxxxxxxxxxxxxxxxxxx
        ReportedBy: xen703@xxxxxxxxxxxxxxxxxxx


I just expirienced FS corruption on a OpenBSD HVM. It ripped the MBR appart.
And I was not fideling with the DiskLayout at all.

output of xm dmesg:
(XEN) (GUEST: 61) HVM Loader
(XEN) (GUEST: 61) Detected Xen v3.0.3-0
(XEN) (GUEST: 61) Writing SMBIOS tables ...
(XEN) (GUEST: 61) Loading ROMBIOS ...
(XEN) (GUEST: 61) Loading Cirrus VGABIOS ...
(XEN) (GUEST: 61) Loading VMXAssist ...
(XEN) (GUEST: 61) VMX go ...
(XEN) (GUEST: 61) VMXAssist (Oct 19 2006)
(XEN) (GUEST: 61) Memory size 32 MB
(XEN) (GUEST: 61) E820 map:
(XEN) (GUEST: 61) 0000000000000000 - 000000000009F000 (RAM)
(XEN) (GUEST: 61) 000000000009F000 - 00000000000A0000 (Reserved)
(XEN) (GUEST: 61) 00000000000A0000 - 00000000000C0000 (Type 16)
(XEN) (GUEST: 61) 00000000000F0000 - 0000000000100000 (Reserved)
(XEN) (GUEST: 61) 0000000000100000 - 0000000001FF0000 (RAM)
(XEN) (GUEST: 61) 0000000001FF0000 - 0000000001FFA000 (ACPI Data)
(XEN) (GUEST: 61) 0000000001FFA000 - 0000000001FFD000 (ACPI NVS)
(XEN) (GUEST: 61) 0000000001FFD000 - 0000000001FFE000 (Type 19)
(XEN) (GUEST: 61) 0000000001FFE000 - 0000000001FFF000 (Type 18)
(XEN) (GUEST: 61) 0000000001FFF000 - 0000000002000000 (Type 17)
(XEN) (GUEST: 61) 00000000FEC00000 - 0000000100000000 (Type 16)
(XEN) (GUEST: 61) 
(XEN) (GUEST: 61) Start BIOS ...
(XEN) (GUEST: 61) Starting emulated 16-bit real-mode: ip=F000:FFF0
(XEN) (GUEST: 61)  rombios.c,v 1.138 2005/05/07 15:55:26 vruppert Exp $
(XEN) (GUEST: 61) Remapping master: ICW2 0x8 -> 0x20
(XEN) (GUEST: 61) Remapping slave: ICW2 0x70 -> 0x28
(XEN) (GUEST: 61) VGABios $Id: vgabios.c,v 1.61 2005/05/24 16:50:50 vruppert
Exp $
(XEN) (GUEST: 61) HVMAssist BIOS, 1 cpu, $Revision: 1.138 $ $Date: 2005/05/07
15:55:26 $
(XEN) (GUEST: 61) 
(XEN) (GUEST: 61) ata0-0: PCHS=2080/16/63 translation=lba LCHS=1024/32/63
(XEN) (GUEST: 61) ata0 master: QEMU HARDDISK ATA-7 Hard-Disk (1024 MBytes)
(XEN) (GUEST: 61) ata0  slave: Unknown device
(XEN) (GUEST: 61) 
(XEN) (GUEST: 61) Boot from Hard Disk 0 failed
(XEN) (GUEST: 61) FATAL: Not a bootable disk
(XEN) (GUEST: 61) Unknown opcode at F000:09DF=0xF09DF
(XEN) (GUEST: 61) Halt called from %eip 0xD3F2A

the sympthom is also, that this HVM consumed at lot of CPU from the Hardware
(84%) - though it was basically just hanging at this stage at the bios.

The broken MBR:
root@unity:/srv/xen/vmx/4I/raven# hexdump -n 1024 -vC wd0-openbsd_4.0.img
00000000  f8 41 02 00 00 00 00 00  00 02 00 00 00 00 00 00  |.A..............|
00000010  ef ed c5 45 00 00 00 00  f2 ed c5 45 00 87 93 03  |...E.......E....|
00000020  f2 ed c5 45 00 87 93 03  e8 e4 03 00 00 00 00 00  |...E............|
00000030  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
00000040  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
00000050  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
00000060  00 00 00 00 00 00 00 00  04 00 00 00 17 56 1e 6e  |.............V.n|
00000070  19 00 00 00 19 00 00 00  00 00 00 00 00 00 00 00  |................|
00000080  6d 41 05 00 00 00 00 00  00 02 00 00 00 00 00 00  |mA..............|
00000090  c1 37 c5 45 00 00 00 00  c4 19 93 45 00 00 00 00  |.7.E.......E....|
000000a0  7c 98 97 45 00 16 d6 36  d3 d6 03 00 00 00 00 00  ||..E...6........|
000000b0  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
000000c0  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
000000d0  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
000000e0  00 00 00 00 00 00 00 00  04 00 00 00 7d c4 79 09  |............}.y.|
000000f0  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
00000100  49 41 02 00 00 00 00 00  00 02 00 00 00 00 00 00  |IA..............|
00000110  c1 37 c5 45 00 00 00 00  c4 19 93 45 00 00 00 00  |.7.E.......E....|
00000120  7c 98 97 45 00 16 d6 36  d4 d6 03 00 00 00 00 00  ||..E...6........|
00000130  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
00000140  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
00000150  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
00000160  00 00 00 00 00 00 00 00  04 00 00 00 5f f2 1f 25  |............_..%|
00000170  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
00000180  49 41 02 00 00 00 00 00  00 02 00 00 00 00 00 00  |IA..............|
00000190  c1 37 c5 45 00 00 00 00  c4 19 93 45 00 00 00 00  |.7.E.......E....|
000001a0  7c 98 97 45 00 16 d6 36  d5 d6 03 00 00 00 00 00  ||..E...6........|
000001b0  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
000001c0  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
000001d0  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
000001e0  00 00 00 00 00 00 00 00  04 00 00 00 23 e2 a6 ce  |............#...|
000001f0  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
00000200  49 40 02 00 00 00 00 00  00 02 00 00 00 00 00 00  |I@..............|
00000210  a1 37 c5 45 00 00 00 00  c4 19 93 45 00 00 00 00  |.7.E.......E....|
00000220  7c 98 97 45 00 16 d6 36  d6 d6 03 00 00 00 00 00  ||..E...6........|
00000230  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
00000240  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
00000250  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
00000260  00 00 00 00 00 00 00 00  04 00 00 00 e1 5b 1c c8  |.............[..|
00000270  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
00000280  fd 43 02 00 00 00 00 00  00 02 00 00 00 00 00 00  |.C..............|
00000290  a2 37 c5 45 80 93 dc 14  c4 19 93 45 00 00 00 00  |.7.E.......E....|
000002a0  7c 98 97 45 00 16 d6 36  d7 d6 03 00 00 00 00 00  ||..E...6........|
000002b0  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
000002c0  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
000002d0  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
000002e0  00 00 00 00 00 00 00 00  04 00 00 00 a5 ac 31 7e  |..............1~|
000002f0  42 00 00 00 75 00 00 00  00 00 00 00 00 00 00 00  |B...u...........|
00000300  c0 41 02 00 00 00 00 00  00 2e 00 00 00 00 00 00  |.A..............|
00000310  37 bf c5 45 00 00 00 00  e8 bb c5 45 80 36 be 26  |7..E.......E.6.&|
00000320  e8 bb c5 45 80 36 be 26  58 e6 03 00 00 00 00 00  |...E.6.&X.......|
00000330  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
00000340  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
00000350  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
00000360  00 00 00 00 00 00 00 00  18 00 00 00 03 e6 88 68  |...............h|
00000370  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
00000380  fd 41 02 00 00 00 00 00  00 02 00 00 00 00 00 00  |.A..............|
00000390  a2 37 c5 45 00 00 00 00  c4 19 93 45 00 00 00 00  |.7.E.......E....|
000003a0  7c 98 97 45 00 16 d6 36  d9 d6 03 00 00 00 00 00  ||..E...6........|
000003b0  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
000003c0  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
000003d0  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
000003e0  00 00 00 00 00 00 00 00  04 00 00 00 81 2a 03 91  |.............*..|
000003f0  00 00 00 00 01 00 00 00  00 00 00 00 00 00 00 00  |................|

As reference, a working MBR
00000000  ea 05 00 c0 07 8c c8 8e  d0 bc fc ff 8e d8 b8 a0  |................|
00000010  07 8e c0 31 f6 31 ff b9  00 02 fc f3 a4 ea 22 00  |...1.1........".|
00000020  a0 07 1e 07 0e 1f b4 02  cd 16 a8 03 74 0a b0 07  |............t...|
00000030  e8 cb 00 80 0e b4 01 01  f6 c2 80 75 08 be 36 01  |...........u..6.|
00000040  e8 af 00 b2 80 be be 01  b9 04 00 8a 04 3c 80 74  |.............<.t|
00000050  0f 83 c6 10 e2 f5 be 6a  01 e8 96 00 fb f4 eb fc  |.......j........|
00000060  88 d0 24 0f 04 30 a2 27  01 b0 34 28 c8 a2 34 01  |..$..0.'..4(..4.|
00000070  56 be 1a 01 f6 06 b4 01  01 75 01 46 e8 73 00 5e  |V........u.F.s.^|
00000080  26 c7 06 fe 01 00 00 f6  06 b4 01 01 75 31 88 14  |&...........u1..|
00000090  bb aa 55 b4 41 cd 13 8a  14 72 24 81 fb 55 aa 75  |..U.A....r$..U.u|
000000a0  1e f6 c1 01 74 19 b0 2e  e8 53 00 66 8b 4c 08 66  |....t....S.f.L.f|
000000b0  89 0e 12 01 56 b4 42 be  0a 01 cd 13 5e 73 19 b0  |....V.B.....^s..|
000000c0  3b e8 3a 00 8a 74 01 8b  4c 02 b8 01 02 31 db cd  |;.:..t..L....1..|
000000d0  13 73 05 be 52 01 eb 81  be 7d 01 e8 14 00 26 81  |.s..R....}....&.|
000000e0  3e fe 01 55 aa 75 05 ea  00 7c 00 00 be 61 01 e9  |>..U.u...|...a..|
000000f0  67 ff 50 fc ac 84 c0 74  0f e8 02 00 eb f6 50 53  |g.P....t......PS|
00000100  b4 0e bb 01 00 cd 10 5b  58 c3 10 00 01 00 00 00  |.......[X.......|
00000110  c0 07 00 00 00 00 00 00  00 00 21 55 73 69 6e 67  |..........!Using|
00000120  20 64 72 69 76 65 20 58  2c 20 70 61 72 74 69 74  | drive X, partit|
00000130  69 6f 6e 20 59 00 4d 42  52 20 6f 6e 20 66 6c 6f  |ion Y.MBR on flo|
00000140  70 70 79 20 6f 72 20 6f  6c 64 20 42 49 4f 53 0d  |ppy or old BIOS.|
00000150  0a 00 0d 0a 52 65 61 64  20 65 72 72 6f 72 0d 0a  |....Read error..|
00000160  00 4e 6f 20 4f 2f 53 0d  0a 00 4e 6f 20 61 63 74  |.No O/S...No act|
00000170  69 76 65 20 70 61 72 74  69 74 69 6f 6e 0d 0a 00  |ive partition...|
00000180  90 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
00000190  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
000001a0  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
000001b0  00 00 00 00 00 00 4f 78  00 00 00 00 00 00 00 00  |......Ox........|
000001c0  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
000001d0  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
000001e0  00 00 00 00 00 00 00 00  00 00 00 00 00 00 80 01  |................|
000001f0  01 00 a6 1f ff ff 3f 00  00 00 c1 fd 1f 00 55 aa  |......?.......U.|
00000200  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
00000210  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
00000220  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
00000230  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
00000240  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
00000250  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
00000260  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
00000270  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
00000280  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
00000290  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
000002a0  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
000002b0  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
000002c0  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
000002d0  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
000002e0  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
000002f0  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
00000300  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
00000310  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
00000320  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
00000330  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
00000340  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
00000350  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
00000360  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
00000370  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
00000380  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
00000390  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
000003a0  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
000003b0  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
000003c0  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
000003d0  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
000003e0  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
000003f0  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|

The broken MBR has some kind of pattern - but as of now, I'm not able to tell
what it tells.


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