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[linux-lvm] kernel BUG at dm-snapshot.c:986!



Hello lvm folk.

I didn't find this as a known issue on the mailing list archives so I
figure I should post.  As the subject says I hit a BUG today playing with
lvm2.  What I did was:

1) create a 22 GB vg out using one pv
   (one partition on a scsi disk -- /dev/sda2)
2) extend the vg to 22GB to another pv
   (another partition on a different scsi disk -- /dev/sdb2)
3) create a lv of 15GB
4) mkreiserfs, mount and copy some stuff (contents of /etc)
   over to the new volume
5) umount, resize the lv to 21GB, and resize reiserfs to fill the device
6) mount, and create a 4GB file --
   (dd if=/dev/zero of=STUFF bs=1024k count=4096)
7) create a snapshot lv of 1GB
8) remove the STUFF file from the origin
9) remove the snapshot and attempt to create a smaller snapshot (100MB)

at this point I got the following:

(scsi0:A:2:0): Locking max tag count at 64
device-mapper: snapshot is marked invalid
device-mapper: Couldn't create exception store
device-mapper: error adding target to table
kernel BUG at dm-snapshot.c:986!
invalid operand: 0000
CPU:    0
EIP:    0010:[<c0214300>]    Tainted: P
EFLAGS: 00010246
eax: 00000000   ebx: c03574d8   ecx: f7b50808   edx: 00000000
esi: f7b4ac00   edi: f7037300   ebp: 00000001   esp: f2295e5c
ds: 0018   es: 0018   ss: 0018
Process lvcreate (pid: 1512, stackpage=f2295000)
Stack: 0000fe01 f7037300 f7355400 c020e9ac d39b5240 f7037300 00000001
       f42a4e8c f42a4e80 f7037300 00000008 01500000 000707c0 c01d99fc 
       c03524d0 00000001 f7037300 00000012 000021d2 00000008 00000001 
       0000c73c 00000000
c01d9abb
Call Trace:    [<c020e9ac>] [<c01d99fc>] [<c01d9abb>] [<c0141edc>]
               [<c0141fc5>] [<c0142015>] [<c014213a>] [<c01422c7>] 
               [<c014242f>] [<c010774f>]
Code: 0f 0b da 03 b3 d8 28 c0 eb c3 8d b6 00 00 00 00 83 ec 20 83
 kernel BUG at dm-snapshot.c:986!
invalid operand: 0000
CPU:    0
EIP:    0010:[<c0214300>]    Tainted: P
EFLAGS: 00010246
eax: 00000000   ebx: c03574d8   ecx: f7b50808   edx: 00000000
esi: f7b4ac00   edi: f7053b00   ebp: 00000001   esp: f7bade9c
ds: 0018   es: 0018   ss: 0018
Process kupdated (pid: 9, stackpage=f7bad000)
Stack: 0000fe01 f7053b00 f7355400 c020e9ac d39b5240 f7053b00 00000001
       f42a4ea4 f42a4e98 f7053b00 00000008 01500000 000708c0 c01d99fc 
       c03524d0 00000001 f7053b00 00000296 f7bac000 00000008 00000001 
       0000c720 00000000 c01d9abb
Call Trace:    [<c020e9ac>] [<c01d99fc>] [<c01d9abb>] [<c0141edc>]
               [<c0141fc5>] [<c0145b7d>] [<c0145ead>] [<c0105000>] 
               [<c0105000>] [<c010590e>] [<c0145db0>]

Code: 0f 0b da 03 b3 d8 28 c0 eb c3 8d b6 00 00 00 00 83 ec 20 83


The system stayed up however, but any further lvm commands would just hang.
Attached, you will find the dmesg log (with the oops report in it) and the
ksymoops log.  Please let me know if any further information is needed as
this is my first kernel bug report.

Thank you for your time.

---max kalika
--max lsit ucsb edu
-lsit systems administrator
at ffff6000
__va_range(0xfdda0, 0x50): idx=8 mapped at ffff6000
ACPI table found: SPCR v1 [DELL   PE2650   0.1]
Enabling the CPU's according to the ACPI table
Intel MultiProcessor Specification v1.4
    Virtual Wire compatibility mode.
OEM ID: DELL     Product ID: PE 0121      APIC at: 0xFEE00000
I/O APIC #4 Version 17 at 0xFEC00000.
I/O APIC #5 Version 17 at 0xFEC01000.
I/O APIC #6 Version 17 at 0xFEC02000.
Processors: 4
Kernel command line: root=/dev/sda1
Initializing CPU#0
Detected 2786.929 MHz processor.
Console: colour VGA+ 80x25
Calibrating delay loop... 5557.45 BogoMIPS
Memory: 2069512k/2097088k available (1442k kernel code, 27192k reserved, 325k data, 256k init, 1179584k highmem)
Dentry cache hash table entries: 262144 (order: 9, 2097152 bytes)
Inode cache hash table entries: 131072 (order: 8, 1048576 bytes)
Mount-cache hash table entries: 32768 (order: 6, 262144 bytes)
Buffer-cache hash table entries: 131072 (order: 7, 524288 bytes)
Page-cache hash table entries: 524288 (order: 9, 2097152 bytes)
CPU: L1 I cache: 0K, L1 D cache: 8K
CPU: L2 cache: 512K
CPU: Physical Processor ID: 0
Intel machine check architecture supported.
Intel machine check reporting enabled on CPU#0.
CPU:     After generic, caps: bfebfbff 00000000 00000000 00000000
CPU:             Common caps: bfebfbff 00000000 00000000 00000000
Enabling fast FPU save and restore... done.
Enabling unmasked SIMD FPU exception support... done.
Checking 'hlt' instruction... OK.
POSIX conformance testing by UNIFIX
mtrr: v1.40 (20010327) Richard Gooch (rgooch atnf csiro au)
mtrr: detected mtrr type: Intel
CPU: L1 I cache: 0K, L1 D cache: 8K
CPU: L2 cache: 512K
CPU: Physical Processor ID: 0
Intel machine check reporting enabled on CPU#0.
CPU:     After generic, caps: bfebfbff 00000000 00000000 00000000
CPU:             Common caps: bfebfbff 00000000 00000000 00000000
CPU0: Intel(R) Xeon(TM) CPU 2.80GHz stepping 07
per-CPU timeslice cutoff: 1463.01 usecs.
enabled ExtINT on CPU#0
ESR value before enabling vector: 00000040
ESR value after enabling vector: 00000000
Booting processor 1/1 eip 2000
Initializing CPU#1
masked ExtINT on CPU#1
ESR value before enabling vector: 00000000
ESR value after enabling vector: 00000000
Calibrating delay loop... 5570.56 BogoMIPS
CPU: L1 I cache: 0K, L1 D cache: 8K
CPU: L2 cache: 512K
CPU: Physical Processor ID: 0
Intel machine check reporting enabled on CPU#1.
CPU:     After generic, caps: bfebfbff 00000000 00000000 00000000
CPU:             Common caps: bfebfbff 00000000 00000000 00000000
CPU1: Intel(R) Xeon(TM) CPU 2.80GHz stepping 07
Booting processor 2/2 eip 2000
Initializing CPU#2
masked ExtINT on CPU#2
ESR value before enabling vector: 00000000
ESR value after enabling vector: 00000000
Calibrating delay loop... 5570.56 BogoMIPS
CPU: L1 I cache: 0K, L1 D cache: 8K
CPU: L2 cache: 512K
CPU: Physical Processor ID: 3
Intel machine check reporting enabled on CPU#2.
CPU:     After generic, caps: bfebfbff 00000000 00000000 00000000
CPU:             Common caps: bfebfbff 00000000 00000000 00000000
CPU2: Intel(R) Xeon(TM) CPU 2.80GHz stepping 07
Booting processor 3/3 eip 2000
Initializing CPU#3
masked ExtINT on CPU#3
ESR value before enabling vector: 00000000
ESR value after enabling vector: 00000000
Calibrating delay loop... 5570.56 BogoMIPS
CPU: L1 I cache: 0K, L1 D cache: 8K
CPU: L2 cache: 512K
CPU: Physical Processor ID: 3
Intel machine check reporting enabled on CPU#3.
CPU:     After generic, caps: bfebfbff 00000000 00000000 00000000
CPU:             Common caps: bfebfbff 00000000 00000000 00000000
CPU3: Intel(R) Xeon(TM) CPU 2.80GHz stepping 07
Total of 4 processors activated (22269.13 BogoMIPS).
cpu_sibling_map[0] = 1
cpu_sibling_map[1] = 0
cpu_sibling_map[2] = 3
cpu_sibling_map[3] = 2
ENABLING IO-APIC IRQs
Setting 4 in the phys_id_present_map
....changing IO-APIC physical APIC ID to 4 ... ok.
Setting 5 in the phys_id_present_map
....changing IO-APIC physical APIC ID to 5 ... ok.
Setting 6 in the phys_id_present_map
....changing IO-APIC physical APIC ID to 6 ... ok.
init IO_APIC IRQs
 IO-APIC (apicid-pin) 4-0, 4-7, 4-10, 4-11, 4-13, 6-0, 6-1, 6-2, 6-3, 6-4, 6-5, 6-6, 6-7, 6-8, 6-9, 6-10, 6-11, 6-12, 6-13, 6-14, 6-15 not connected.
...TIMER: vector=0x31 pin1=2 pin2=0
...MP-BIOS bug: 8254 timer not connected to IO-APIC
....trying to set up timer (IRQ0) through the 8259A ... 
...... (found pin 0) ...works.
number of MP IRQ sources: 33.
number of IO-APIC #4 registers: 16.
number of IO-APIC #5 registers: 16.
number of IO-APIC #6 registers: 16.
testing the IO APIC.......................

IO APIC #4......
..... register #00: 04000000
........    : physical APIC id: 04
..... register #01: 000F0011
........     : max redirection entries: 000F
........     : PRQ implemented: 0
........     : IO APIC version: 0011
..... register #02: 04000000
........     : arbitration: 04
..... IRQ redirection table:
 NR Log Phy Mask Trig IRR Pol Stat Dest Deli Vect:   
 00 00F 0F  0    0    0   0   0    1    1    31
 01 00F 0F  0    0    0   0   0    1    1    39
 02 000 00  1    0    0   0   0    0    0    00
 03 00F 0F  0    0    0   0   0    1    1    41
 04 00F 0F  0    0    0   0   0    1    1    49
 05 00F 0F  1    1    0   1   0    1    1    51
 06 00F 0F  0    0    0   0   0    1    1    59
 07 000 00  1    0    0   0   0    0    0    00
 08 00F 0F  0    0    0   0   0    1    1    61
 09 00F 0F  0    0    0   0   0    1    1    69
 0a 000 00  1    0    0   0   0    0    0    00
 0b 000 00  1    0    0   0   0    0    0    00
 0c 00F 0F  0    0    0   0   0    1    1    71
 0d 000 00  1    0    0   0   0    0    0    00
 0e 00F 0F  0    0    0   0   0    1    1    79
 0f 00F 0F  0    0    0   0   0    1    1    81

IO APIC #5......
..... register #00: 05000000
........    : physical APIC id: 05
..... register #01: 000F0011
........     : max redirection entries: 000F
........     : PRQ implemented: 0
........     : IO APIC version: 0011
..... register #02: 05000000
........     : arbitration: 05
..... IRQ redirection table:
 NR Log Phy Mask Trig IRR Pol Stat Dest Deli Vect:   
 00 00F 0F  1    1    0   1   0    1    1    89
 01 00F 0F  1    1    0   1   0    1    1    91
 02 00F 0F  1    1    0   1   0    1    1    99
 03 00F 0F  1    1    0   1   0    1    1    A1
 04 00F 0F  1    1    0   1   0    1    1    A9
 05 00F 0F  1    1    0   1   0    1    1    B1
 06 00F 0F  1    1    0   1   0    1    1    B9
 07 00F 0F  1    1    0   1   0    1    1    C1
 08 00F 0F  1    1    0   1   0    1    1    C9
 09 00F 0F  1    1    0   1   0    1    1    D1
 0a 00F 0F  1    1    0   1   0    1    1    D9
 0b 00F 0F  1    1    0   1   0    1    1    E1
 0c 00F 0F  1    1    0   1   0    1    1    E9
 0d 00F 0F  1    1    0   1   0    1    1    32
 0e 00F 0F  1    1    0   1   0    1    1    3A
 0f 00F 0F  1    1    0   1   0    1    1    42

IO APIC #6......
..... register #00: 06000000
........    : physical APIC id: 06
..... register #01: 000F0011
........     : max redirection entries: 000F
........     : PRQ implemented: 0
........     : IO APIC version: 0011
..... register #02: 06000000
........     : arbitration: 06
..... IRQ redirection table:
 NR Log Phy Mask Trig IRR Pol Stat Dest Deli Vect:   
 00 000 00  1    0    0   0   0    0    0    00
 01 000 00  1    0    0   0   0    0    0    00
 02 000 00  1    0    0   0   0    0    0    00
 03 000 00  1    0    0   0   0    0    0    00
 04 000 00  1    0    0   0   0    0    0    00
 05 000 00  1    0    0   0   0    0    0    00
 06 000 00  1    0    0   0   0    0    0    00
 07 000 00  1    0    0   0   0    0    0    00
 08 000 00  1    0    0   0   0    0    0    00
 09 000 00  1    0    0   0   0    0    0    00
 0a 000 00  1    0    0   0   0    0    0    00
 0b 000 00  1    0    0   0   0    0    0    00
 0c 000 00  1    0    0   0   0    0    0    00
 0d 000 00  1    0    0   0   0    0    0    00
 0e 000 00  1    0    0   0   0    0    0    00
 0f 000 00  1    0    0   0   0    0    0    00
IRQ to pin mappings:
IRQ0 -> 0:0
IRQ1 -> 0:1
IRQ3 -> 0:3
IRQ4 -> 0:4
IRQ5 -> 0:5
IRQ6 -> 0:6
IRQ8 -> 0:8
IRQ9 -> 0:9
IRQ12 -> 0:12
IRQ14 -> 0:14
IRQ15 -> 0:15
IRQ16 -> 1:0
IRQ17 -> 1:1
IRQ18 -> 1:2
IRQ19 -> 1:3
IRQ20 -> 1:4
IRQ21 -> 1:5
IRQ22 -> 1:6
IRQ23 -> 1:7
IRQ24 -> 1:8
IRQ25 -> 1:9
IRQ26 -> 1:10
IRQ27 -> 1:11
IRQ28 -> 1:12
IRQ29 -> 1:13
IRQ30 -> 1:14
IRQ31 -> 1:15
..................................... done.
Using local APIC timer interrupts.
calibrating APIC timer ...
...... CPU clock speed is 2787.0443 MHz.
...... host bus clock speed is 99.5372 MHz.
cpu: 0, clocks: 995372, slice: 199074
CPU0<T0:995360,T1:796272,D:14,S:199074,C:995372>
cpu: 1, clocks: 995372, slice: 199074
cpu: 3, clocks: 995372, slice: 199074
cpu: 2, clocks: 995372, slice: 199074
CPU1<T0:995360,T1:597200,D:12,S:199074,C:995372>
CPU2<T0:995360,T1:398128,D:10,S:199074,C:995372>
CPU3<T0:995360,T1:199056,D:8,S:199074,C:995372>
checking TSC synchronization across CPUs: passed.
Waiting on wait_init_idle (map = 0xe)
All processors have done init_idle
PCI: PCI BIOS revision 2.10 entry at 0xfc97e, last bus=5
PCI: Using configuration type 1
PCI: Probing PCI hardware
PCI: Discovered primary peer bus 01 [IRQ]
PCI: Discovered primary peer bus 02 [IRQ]
PCI: Discovered primary peer bus 03 [IRQ]
PCI: Discovered primary peer bus 04 [IRQ]
PCI: Using IRQ router ServerWorks [1166/0201] at 00:0f.0
PCI->APIC IRQ transform: (B0,I4,P0) -> 19
PCI->APIC IRQ transform: (B0,I4,P1) -> 23
PCI->APIC IRQ transform: (B0,I4,P2) -> 27
PCI->APIC IRQ transform: (B3,I6,P0) -> 28
PCI->APIC IRQ transform: (B3,I8,P0) -> 29
PCI->APIC IRQ transform: (B5,I6,P0) -> 30
PCI->APIC IRQ transform: (B5,I6,P1) -> 31
Linux NET4.0 for Linux 2.4
Based upon Swansea University Computer Society NET3.039
Initializing RT netlink socket
Starting kswapd
allocated 32 pages and 32 bhs reserved for the highmem bounces
VFS: Diskquotas version dquot_6.5.1 initialized
Journalled Block Device driver loaded
devfs: v1.12c (20020818) Richard Gooch (rgooch atnf csiro au)
devfs: boot_options: 0x1
pty: 256 Unix98 ptys configured
Serial driver version 5.05c (2001-07-08) with MANY_PORTS SHARE_IRQ SERIAL_PCI enabled
ttyS00 at 0x03f8 (irq = 4) is a 16550A
ttyS01 at 0x02f8 (irq = 3) is a 16550A
Real Time Clock Driver v1.10e
tg3.c:v1.2 (Nov 14, 2002)
eth0: Tigon3 [partno(BCM95701A10) rev 0105 PHY(5701)] (PCIX:133MHz:64-bit) 10/100/1000BaseT Ethernet 00:06:5b:fc:b8:34
eth1: Tigon3 [partno(BCM95701A10) rev 0105 PHY(5701)] (PCIX:133MHz:64-bit) 10/100/1000BaseT Ethernet 00:06:5b:fc:b8:35
SCSI subsystem driver Revision: 1.00
scsi0 : Adaptec AIC7XXX EISA/VLB/PCI SCSI HBA DRIVER, Rev 6.2.8
        <Adaptec aic7899 Ultra160 SCSI adapter>
        aic7899: Ultra160 Wide Channel A, SCSI Id=7, 32/253 SCBs

scsi1 : Adaptec AIC7XXX EISA/VLB/PCI SCSI HBA DRIVER, Rev 6.2.8
        <Adaptec aic7899 Ultra160 SCSI adapter>
        aic7899: Ultra160 Wide Channel B, SCSI Id=7, 32/253 SCBs

blk: queue f7b6de18, I/O limit 4095Mb (mask 0xffffffff)
  Vendor: SEAGATE   Model: ST318453LC        Rev: DX03
  Type:   Direct-Access                      ANSI SCSI revision: 03
blk: queue f7b6dc18, I/O limit 4095Mb (mask 0xffffffff)
(scsi0:A:0): 160.000MB/s transfers (80.000MHz DT, offset 63, 16bit)
  Vendor: SEAGATE   Model: ST318453LC        Rev: DX03
  Type:   Direct-Access                      ANSI SCSI revision: 03
blk: queue f7b6d418, I/O limit 4095Mb (mask 0xffffffff)
(scsi0:A:2): 160.000MB/s transfers (80.000MHz DT, offset 63, 16bit)
  Vendor: PE/PV     Model: 1x5 SCSI BP       Rev: 1.1 
  Type:   Processor                          ANSI SCSI revision: 02
blk: queue f7b59818, I/O limit 4095Mb (mask 0xffffffff)
scsi0:A:0:0: Tagged Queuing enabled.  Depth 253
scsi0:A:2:0: Tagged Queuing enabled.  Depth 253
Attached scsi disk sda at scsi0, channel 0, id 0, lun 0
Attached scsi disk sdb at scsi0, channel 0, id 2, lun 0
SCSI device sda: 35566478 512-byte hdwr sectors (18210 MB)
Partition check:
 /dev/scsi/host0/bus0/target0/lun0: p1 p2 p3
SCSI device sdb: 35566478 512-byte hdwr sectors (18210 MB)
 /dev/scsi/host0/bus0/target2/lun0: p1 p2
device-mapper: 1.0.10-ioctl (2003-03-27) initialised: dm uk sistina com
NET4: Linux TCP/IP 1.0 for NET4.0
IP Protocols: ICMP, UDP, TCP, IGMP
IP: routing cache hash table of 16384 buckets, 128Kbytes
TCP: Hash tables configured (established 262144 bind 65536)
NET4: Unix domain sockets 1.0/SMP for Linux NET4.0.
reiserfs: checking transaction log (device 08:01) ...
Using r5 hash to sort names
ReiserFS version 3.6.25
VFS: Mounted root (reiserfs filesystem) readonly.
Mounted devfs on /dev
Freeing unused kernel memory: 256k freed
Adding Swap: 1710912k swap-space (priority -1)
tg3: eth0: Link is up at 100 Mbps, full duplex.
tg3: eth0: Flow control is off for TX and off for RX.
Attached scsi generic sg2 at scsi0, channel 0, id 6, lun 0,  type 3
reiserfs: checking transaction log (device fe:02) ...
Using r5 hash to sort names
ReiserFS version 3.6.25
reiserfs: checking transaction log (device fe:03) ...
Using r5 hash to sort names
ReiserFS version 3.6.25
(scsi0:A:0:0): Locking max tag count at 64
reiserfs: checking transaction log (device fe:02) ...
reiserfs: replayed 4 transactions in 2 seconds
Using r5 hash to sort names
ReiserFS version 3.6.25
reiserfs: checking transaction log (device fe:03) ...
Using r5 hash to sort names
ReiserFS version 3.6.25
reiserfs: checking transaction log (device fe:02) ...
reiserfs: replayed 1 transactions in 1 seconds
Using r5 hash to sort names
ReiserFS version 3.6.25
reiserfs: checking transaction log (device fe:02) ...
Using r5 hash to sort names
ReiserFS version 3.6.25
(scsi0:A:2:0): Locking max tag count at 64
device-mapper: snapshot is marked invalid
device-mapper: Couldn't create exception store
device-mapper: error adding target to table
kernel BUG at dm-snapshot.c:986!
invalid operand: 0000
CPU:    0
EIP:    0010:[<c0214300>]    Tainted: P 
EFLAGS: 00010246
eax: 00000000   ebx: c03574d8   ecx: f7b50808   edx: 00000000
esi: f7b4ac00   edi: f7037300   ebp: 00000001   esp: f2295e5c
ds: 0018   es: 0018   ss: 0018
Process lvcreate (pid: 1512, stackpage=f2295000)
Stack: 0000fe01 f7037300 f7355400 c020e9ac d39b5240 f7037300 00000001 f42a4e8c 
       f42a4e80 f7037300 00000008 01500000 000707c0 c01d99fc c03524d0 00000001 
       f7037300 00000012 000021d2 00000008 00000001 0000c73c 00000000 c01d9abb 
Call Trace:    [<c020e9ac>] [<c01d99fc>] [<c01d9abb>] [<c0141edc>] [<c0141fc5>]
  [<c0142015>] [<c014213a>] [<c01422c7>] [<c014242f>] [<c010774f>]

Code: 0f 0b da 03 b3 d8 28 c0 eb c3 8d b6 00 00 00 00 83 ec 20 83 
 kernel BUG at dm-snapshot.c:986!
invalid operand: 0000
CPU:    0
EIP:    0010:[<c0214300>]    Tainted: P 
EFLAGS: 00010246
eax: 00000000   ebx: c03574d8   ecx: f7b50808   edx: 00000000
esi: f7b4ac00   edi: f7053b00   ebp: 00000001   esp: f7bade9c
ds: 0018   es: 0018   ss: 0018
Process kupdated (pid: 9, stackpage=f7bad000)
Stack: 0000fe01 f7053b00 f7355400 c020e9ac d39b5240 f7053b00 00000001 f42a4ea4 
       f42a4e98 f7053b00 00000008 01500000 000708c0 c01d99fc c03524d0 00000001 
       f7053b00 00000296 f7bac000 00000008 00000001 0000c720 00000000 c01d9abb 
Call Trace:    [<c020e9ac>] [<c01d99fc>] [<c01d9abb>] [<c0141edc>] [<c0141fc5>]
  [<c0145b7d>] [<c0145ead>] [<c0105000>] [<c0105000>] [<c010590e>] [<c0145db0>]

Code: 0f 0b da 03 b3 d8 28 c0 eb c3 8d b6 00 00 00 00 83 ec 20 83 
 
ksymoops 2.4.8 on i686 2.4.20-lsit-r0.  Options used
     -V (default)
     -k /proc/ksyms (default)
     -l /proc/modules (default)
     -o /lib/modules/2.4.20-lsit-r0/ (default)
     -m /boot/System.map.ike (specified)

invalid operand: 0000
CPU:    0
EIP:    0010:[<c0214300>]    Tainted: P 
Using defaults from ksymoops -t elf32-i386 -a i386
EFLAGS: 00010246
eax: 00000000   ebx: c03574d8   ecx: f7b50808   edx: 00000000
esi: f7b4ac00   edi: f7037300   ebp: 00000001   esp: f2295e5c
ds: 0018   es: 0018   ss: 0018
Process lvcreate (pid: 1512, stackpage=f2295000)
Stack: 0000fe01 f7037300 f7355400 c020e9ac d39b5240 f7037300 00000001 f42a4e8c 
       f42a4e80 f7037300 00000008 01500000 000707c0 c01d99fc c03524d0 00000001 
       f7037300 00000012 000021d2 00000008 00000001 0000c73c 00000000 c01d9abb 
Call Trace:    [<c020e9ac>] [<c01d99fc>] [<c01d9abb>] [<c0141edc>] [<c0141fc5>]
  [<c0142015>] [<c014213a>] [<c01422c7>] [<c014242f>] [<c010774f>]
Code: 0f 0b da 03 b3 d8 28 c0 eb c3 8d b6 00 00 00 00 83 ec 20 83 


>>EIP; c0214300 <do_origin+60/70>   <=====

>>ebx; c03574d8 <_origins_lock+0/28>
>>ecx; f7b50808 <_end+377e5ab0/3863f308>
>>esi; f7b4ac00 <_end+377dfea8/3863f308>
>>edi; f7037300 <_end+36ccc5a8/3863f308>
>>esp; f2295e5c <_end+31f2b104/3863f308>

Trace; c020e9ac <dm_request+17c/1d0>
Trace; c01d99fc <generic_make_request+dc/140>
Trace; c01d9abb <submit_bh+5b/80>
Trace; c0141edc <write_locked_buffers+2c/40>
Trace; c0141fc5 <write_some_buffers+d5/100>
Trace; c0142015 <write_unlocked_buffers+25/30>
Trace; c014213a <sync_buffers+1a/70>
Trace; c01422c7 <fsync_dev+27/b0>
Trace; c014242f <sys_sync+f/20>
Trace; c010774f <system_call+33/38>

Code;  c0214300 <do_origin+60/70>
00000000 <_EIP>:
Code;  c0214300 <do_origin+60/70>   <=====
   0:   0f 0b                     ud2a      <=====
Code;  c0214302 <do_origin+62/70>
   2:   da 03                     fiaddl (%ebx)
Code;  c0214304 <do_origin+64/70>
   4:   b3 d8                     mov    $0xd8,%bl
Code;  c0214306 <do_origin+66/70>
   6:   28 c0                     sub    %al,%al
Code;  c0214308 <do_origin+68/70>
   8:   eb c3                     jmp    ffffffcd <_EIP+0xffffffcd>
Code;  c021430a <do_origin+6a/70>
   a:   8d b6 00 00 00 00         lea    0x0(%esi),%esi
Code;  c0214310 <origin_ctr+0/80>
  10:   83 ec 20                  sub    $0x20,%esp
Code;  c0214313 <origin_ctr+3/80>
  13:   83 00 00                  addl   $0x0,(%eax)

 kernel BUG at dm-snapshot.c:986!
invalid operand: 0000
CPU:    0
EIP:    0010:[<c0214300>]    Tainted: P 
EFLAGS: 00010246
eax: 00000000   ebx: c03574d8   ecx: f7b50808   edx: 00000000
esi: f7b4ac00   edi: f7053b00   ebp: 00000001   esp: f7bade9c
ds: 0018   es: 0018   ss: 0018
Process kupdated (pid: 9, stackpage=f7bad000)
Stack: 0000fe01 f7053b00 f7355400 c020e9ac d39b5240 f7053b00 00000001 f42a4ea4 
       f42a4e98 f7053b00 00000008 01500000 000708c0 c01d99fc c03524d0 00000001 
       f7053b00 00000296 f7bac000 00000008 00000001 0000c720 00000000 c01d9abb 
Call Trace:    [<c020e9ac>] [<c01d99fc>] [<c01d9abb>] [<c0141edc>] [<c0141fc5>]
  [<c0145b7d>] [<c0145ead>] [<c0105000>] [<c0105000>] [<c010590e>] [<c0145db0>]
Code: 0f 0b da 03 b3 d8 28 c0 eb c3 8d b6 00 00 00 00 83 ec 20 83 


>>EIP; c0214300 <do_origin+60/70>   <=====

>>ebx; c03574d8 <_origins_lock+0/28>
>>ecx; f7b50808 <_end+377e5ab0/3863f308>
>>esi; f7b4ac00 <_end+377dfea8/3863f308>
>>edi; f7053b00 <_end+36ce8da8/3863f308>
>>esp; f7bade9c <_end+37843144/3863f308>

Trace; c020e9ac <dm_request+17c/1d0>
Trace; c01d99fc <generic_make_request+dc/140>
Trace; c01d9abb <submit_bh+5b/80>
Trace; c0141edc <write_locked_buffers+2c/40>
Trace; c0141fc5 <write_some_buffers+d5/100>
Trace; c0145b7d <sync_old_buffers+7d/b0>
Trace; c0145ead <kupdate+fd/140>
Trace; c0105000 <_stext+0/0>
Trace; c0105000 <_stext+0/0>
Trace; c010590e <kernel_thread+2e/40>
Trace; c0145db0 <kupdate+0/140>

Code;  c0214300 <do_origin+60/70>
00000000 <_EIP>:
Code;  c0214300 <do_origin+60/70>   <=====
   0:   0f 0b                     ud2a      <=====
Code;  c0214302 <do_origin+62/70>
   2:   da 03                     fiaddl (%ebx)
Code;  c0214304 <do_origin+64/70>
   4:   b3 d8                     mov    $0xd8,%bl
Code;  c0214306 <do_origin+66/70>
   6:   28 c0                     sub    %al,%al
Code;  c0214308 <do_origin+68/70>
   8:   eb c3                     jmp    ffffffcd <_EIP+0xffffffcd>
Code;  c021430a <do_origin+6a/70>
   a:   8d b6 00 00 00 00         lea    0x0(%esi),%esi
Code;  c0214310 <origin_ctr+0/80>
  10:   83 ec 20                  sub    $0x20,%esp
Code;  c0214313 <origin_ctr+3/80>
  13:   83 00 00                  addl   $0x0,(%eax)


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