Public bug reported:
Since updating to 10.10 disk reading of large files is corrupt for high-
memory 64-bit configurations
1. I had 16 GiB RAM organized as 4x4GIB simms, 4-core Intel CPU
2. It was noticed that when copying a 23 GiB folder on a usb-connected
harddrive, diff would report differences
3. I could isolate it down to that read operations of 3 GiB or more data is
corrupted if the 64-bit system has more than 4 GiB ram
I would use command:
md5sum asingle.avi asingleunzipped.avi notsparse.avi; (unzip -p asingle.zip |
md5sum -)
- where files is the same avi video file about 700 MiB
- pass means printing out the identical hash four times
- fail means differing hash or corrupt archive
it was verified that the file is not sparse
64-bit system, more than 4 GiB (any two memory simms):
FAIL: external harddisk 1 using BLACX usb
FAIL: external harddisk 2 using usb enclosure
FAIL: external harddisk 1 using sata to motherboard
PASS: any SSD disk using sata to motherboard
PASS: 64-bit system, 4 GiB RAM (any one simm): any configuration works
PASS: 32-bit system: any configuration works
So, is this a kernel problem? do I have a bad 32-bit kernel module?
I have had serious 64-bit driver problems in the passed, so I suspect this is
software related
ProblemType: Bug
DistroRelease: Ubuntu 10.04
Package: linux-image-2.6.32-26-generic 2.6.32-26.46
Regression: Yes
Reproducible: Yes
ProcVersionSignature: Ubuntu 2.6.32-26.46-generic 2.6.32.24+drm33.11
Uname: Linux 2.6.32-26-generic x86_64
NonfreeKernelModules: nvidia
AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.21.
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC0: foxyboy 2014 F.... pulseaudio
CRDA: Error: [Errno 2] No such file or directory
Card0.Amixer.info:
Card hw:0 'Intel'/'HDA Intel at 0xf5ff4000 irq 22'
Mixer name : 'Realtek ALC1200'
Components : 'HDA:10ec0888,104382fe,00100101'
Controls : 40
Simple ctrls : 22
Date: Mon Nov 15 19:00:26 2010
HibernationDevice: RESUME=UUID=7d11cb5c-7334-4e37-bdf0-f19111625b4a
IwConfig:
lo no wireless extensions.
eth0 no wireless extensions.
MachineType: System manufacturer System Product Name
ProcCmdLine: root=UUID=6e418107-84af-4790-b047-0df1e3d0f0bf ro quiet splash
ProcEnviron:
PATH=(custom, user)
LANG=en_US.utf8
SHELL=/bin/bash
RelatedPackageVersions: linux-firmware 1.34.1
RfKill:
7: hci0: Bluetooth
Soft blocked: yes
Hard blocked: no
SourcePackage: linux
WpaSupplicantLog:
dmi.bios.date: 05/25/2010
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: 1208
dmi.board.asset.tag: To Be Filled By O.E.M.
dmi.board.name: P5Q-EM DO
dmi.board.vendor: ASUSTeK Computer INC.
dmi.board.version: Rev 1.xx
dmi.chassis.asset.tag: Asset-1234567890
dmi.chassis.type: 3
dmi.chassis.vendor: Chassis Manufacture
dmi.chassis.version: Chassis Version
dmi.modalias:
dmi:bvnAmericanMegatrendsInc.:bvr1208:bd05/25/2010:svnSystemmanufacturer:pnSystemProductName:pvrSystemVersion:rvnASUSTeKComputerINC.:rnP5Q-EMDO:rvrRev1.xx:cvnChassisManufacture:ct3:cvrChassisVersion:
dmi.product.name: System Product Name
dmi.product.version: System Version
dmi.sys.vendor: System manufacturer
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug kconfig lucid needs-upstream-testing regression-update
--
Disk read corrupt on x64 exceeding 4 GiB RAM
https://bugs.launchpad.net/bugs/675839
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