mythbuntu-bugs team mailing list archive

[Roland Arendes <roland@xxxxxxxxxx>]

I can confirm this bug with current karmic kernel:
 2.6.31-17-generic #54-Ubuntu SMP Thu Dec 10 17:01:44 UTC 2009 x86_64 GNU/Linux

Steps to reproduce:

Download same file with 2 sources in parallel. I took Opera, and wget.

wget http://ubuntu.intergenia.de/releases/karmic/ubuntu-9.10-desktop-i386.iso
Opera saved to http://ubuntu.intergenia.de/releases/karmic/ubuntu-9.10-desktop-i386.iso-opera

Results:

roland@pdbxe100:~$ md5sum ubuntu-9.10-desktop-i386.iso
8790491bfa9d00f283ed9dd2d77b3906  ubuntu-9.10-desktop-i386.iso
roland@pdbxe100:~$ md5sum ubuntu-9.10-desktop-i386.iso-opera 
3f979c279665cc7d6ead2c11b1060188  ubuntu-9.10-desktop-i386.iso-opera
roland@pdbxe100:~$ ls -l ubuntu-9.10-desktop-i386.iso*
-rw-r--r-- 1 roland roland 723488768 2009-10-28 22:14 ubuntu-9.10-desktop-i386.iso
-rw-r--r-- 1 roland roland 723488768 2010-01-28 15:35 ubuntu-9.10-desktop-i386.iso-opera
roland@pdbxe100:~$ 

Using cmp I found that there were NO differences?!
roland@pdbxe100:~$ cmp ubuntu-9.10-desktop-i386.iso ubuntu-9.10-desktop-i386.iso-opera

I wondered, and compared again via md5sum:
roland@pdbxe100:~$ md5sum ubuntu-9.10-desktop-i386.iso
8790491bfa9d00f283ed9dd2d77b3906  ubuntu-9.10-desktop-i386.iso
roland@pdbxe100:~$ md5sum ubuntu-9.10-desktop-i386.iso-opera 
8790491bfa9d00f283ed9dd2d77b3906  ubuntu-9.10-desktop-i386.iso-opera
roland@pdbxe100:~$ 

So after accessing the files a second time, they seemed to have synced,
flushed after delay .. or whatever.

This are my ext4 flags:
has_journal ext_attr resize_inode dir_index filetype needs_recovery extent flex_bg sparse_super large_file huge_file uninit_bg dir_nlink extra_isize

I created the filesystem manually via mkfs.ext4 /dev/sda4.

-- 
in-place corruption of large files *without fsck or reboot* reported with linux 2.6.31-14.46 on ext4
https://bugs.launchpad.net/bugs/453579
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Status in The Linux Kernel: New
Status in Ubuntu Release Notes: Fix Released
Status in “linux” package in Ubuntu: Triaged
Status in “linux” source package in Karmic: Triaged

Bug description:
There are worrying reports of filesystem corruption on ext4 in karmic.  Scott says:

12:36 < Keybuk> this whole ext4 thing is worrying me
12:36 < Keybuk> I just downloaded an iso image, md5sum didn't match
12:36 < Keybuk> downloaded it into an ext3 partition, matched just fine
12:59 < Keybuk> and I know mvo has seen bugs with corrupted .debs in /var/cache/apt/archives
12:59 < Keybuk> which seems to imply its any file large enough to use lots of extents

I'm opening this bug report so that this bug gets tracked & triaged for karmic.  If we're unable to isolate the issue, we should consider rolling back to ext3 as the default filesystem in the installer.

ProblemType: Bug
Architecture: amd64
ArecordDevices:
 **** List of CAPTURE Hardware Devices ****
 card 0: Intel [HDA Intel], device 0: AD198x Analog [AD198x Analog]
   Subdevices: 1/1
   Subdevice #0: subdevice #0
AudioDevicesInUse:
 USER        PID ACCESS COMMAND
 /dev/snd/controlC0:  vorlon     3350 F.... pulseaudio
Card0.Amixer.info:
 Card hw:0 'Intel'/'HDA Intel at 0xee240000 irq 17'
   Mixer name	: 'Analog Devices AD1981'
   Components	: 'HDA:11d41981,17aa2025,00100200'
   Controls      : 20
   Simple ctrls  : 11
Date: Fri Oct 16 16:01:26 2009
DistroRelease: Ubuntu 9.10
HibernationDevice: RESUME=UUID=f108133c-6b9d-4d28-9058-0b3a0c5549b4
MachineType: LENOVO 6371CTO
Package: linux-image-2.6.31-14-generic 2.6.31-14.46
PccardctlIdent:
 Socket 0:
   no product info available
PccardctlStatus:
 Socket 0:
   no card
ProcCmdLine: root=/dev/mapper/hostname-root ro
ProcEnviron:
 PATH=(custom, user)
 LANG=en_US.UTF-8
 SHELL=/bin/bash
ProcVersionSignature: Ubuntu 2.6.31-13.44-generic
RelatedPackageVersions: linux-firmware 1.22
SourcePackage: linux
Uname: Linux 2.6.31-13-generic x86_64
WpaSupplicantLog:

dmi.bios.date: 12/27/2006
dmi.bios.vendor: LENOVO
dmi.bios.version: 7IET23WW (1.04 )
dmi.board.name: 6371CTO
dmi.board.vendor: LENOVO
dmi.board.version: Not Available
dmi.chassis.asset.tag: No Asset Information
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: Not Available
dmi.modalias: dmi:bvnLENOVO:bvr7IET23WW(1.04):bd12/27/2006:svnLENOVO:pn6371CTO:pvrThinkPadT60:rvnLENOVO:rn6371CTO:rvrNotAvailable:cvnLENOVO:ct10:cvrNotAvailable:
dmi.product.name: 6371CTO
dmi.product.version: ThinkPad T60
dmi.sys.vendor: LENOVO

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