[Bug 593086] Re: Silent wraparound on > 2 TB LVM snapshots

[Phillip Susi]

apport information

** Tags added: apport-collected

** Description changed:

  Ubuntu kernels silently wrap access to disk locations above 2 TB back
  around to zero.  This can easily be reproduced using lvm to create a
  thin provisioned virtual disk:
  
  lvcreate -s -n thin -L 1g --virtualsize 3t vg0
  
  mke2fs -t ext4 -E lazy_itable_init /dev/vg0/thin
  e2fsck -f /dev/vg0/thin
  
  Fsck will find errors in the bitmap because it is actually reading the
  superblock instead of the allocation bitmap situated just after the 2 tb
  mark.
+ 
+ 
+ --- 
+ AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.21.
+ Architecture: amd64
+ AudioDevicesInUse:
+  USER        PID ACCESS COMMAND
+  /dev/snd/controlC0:  psusi      1874 F.... pulseaudio
+ CRDA: Error: [Errno 2] No such file or directory
+ Card0.Amixer.info:
+  Card hw:0 'NVidia'/'HDA NVidia at 0xfe024000 irq 20'
+    Mixer name	: 'Realtek ALC888'
+    Components	: 'HDA:10ec0888,1565820c,00100001'
+    Controls      : 37
+    Simple ctrls  : 20
+ Card1.Amixer.info:
+  Card hw:1 'HDMI'/'HDA ATI HDMI at 0xfd9fc000 irq 16'
+    Mixer name	: 'ATI R6xx HDMI'
+    Components	: 'HDA:1002aa01,00aa0100,00100100'
+    Controls      : 4
+    Simple ctrls  : 1
+ Card1.Amixer.values:
+  Simple mixer control 'IEC958',0
+    Capabilities: pswitch pswitch-joined penum
+    Playback channels: Mono
+    Mono: Playback [off]
+ DistroRelease: Ubuntu 10.04
+ InstallationMedia: Ubuntu 9.10 "Karmic Koala" - Release amd64 (20091027)
+ IwConfig:
+  lo        no wireless extensions.
+  
+  eth0      no wireless extensions.
+ Lsusb:
+  Bus 002 Device 003: ID 045e:0039 Microsoft Corp. IntelliMouse Optical
+  Bus 002 Device 002: ID 045e:00db Microsoft Corp. Natural Ergonomic Keyboard 4000 V1.0
+  Bus 002 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
+  Bus 001 Device 004: ID 058f:6387 Alcor Micro Corp. Transcend JetFlash Flash Drive
+  Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
+ MachineType: BIOSTAR Group TF560 A2+
+ Package: linux (not installed)
+ ProcCmdLine: BOOT_IMAGE=/boot/vmlinuz-2.6.32-22-generic root=/dev/mapper/hostname-lucid ro quiet splash acpi_enforce_resources=lax
+ ProcEnviron:
+  LANG=en_US.utf8
+  SHELL=/bin/bash
+ ProcVersionSignature: Ubuntu 2.6.32-22.36-generic 2.6.32.11+drm33.2
+ Regression: No
+ RelatedPackageVersions: linux-firmware 1.34
+ Reproducible: Yes
+ RfKill:
+  
+ Tags: lucid  needs-upstream-testing
+ Uname: Linux 2.6.32-22-generic x86_64
+ UserGroups: adm admin cdrom dialout dip fax floppy fuse lpadmin plugdev sambashare tape video
+ WifiSyslog: Jun 14 22:36:08 faldara kernel: [ 1446.372143] lo: Disabled Privacy Extensions
+ dmi.bios.date: 06/11/2007
+ dmi.bios.vendor: Phoenix Technologies, LTD
+ dmi.bios.version: 6.00 PG
+ dmi.board.name: TF560 A2+
+ dmi.board.vendor: BIOSTAR Group
+ dmi.board.version: 1.0
+ dmi.chassis.type: 3
+ dmi.chassis.vendor: BIOSTAR Group
+ dmi.chassis.version: TF560 A2+
+ dmi.modalias: dmi:bvnPhoenixTechnologies,LTD:bvr6.00PG:bd06/11/2007:svnBIOSTARGroup:pnTF560A2+:pvr1.0:rvnBIOSTARGroup:rnTF560A2+:rvr1.0:cvnBIOSTARGroup:ct3:cvrTF560A2+:
+ dmi.product.name: TF560 A2+
+ dmi.product.version: 1.0
+ dmi.sys.vendor: BIOSTAR Group

** Attachment added: "AlsaDevices.txt"
   http://launchpadlibrarian.net/50349156/AlsaDevices.txt

-- 
Silent wraparound on > 2 TB LVM snapshots
https://bugs.launchpad.net/bugs/593086
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