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[Jose Bernardo <bernardo@xxxxxxxxxx>]

I just subscribed this bug as I started seeing this behaviour with 2.6.30-rc6 on my aspire one. First it was the 0 length files after a crash (the latest intel drivers still hang sometimes at suspend/resume or at logout/shutdown, and only the magic REISUB gets you out of it), and once I saw my /home mounted R/O because of a ext4 error (unfortunately didn't save dmesg) and after the fsck had again 0 byte files (mostly in my firefox profile, as I was web browsing at the time). Next time I get this bug I'll post here the dmesg.
Some possibly relevant points:
I formated both my / and my /home partitions clean with mkfs.ext4.
I have / on the internal ssd, and /home on a sdhc 8GB card.
I have 1.5GB RAM and no swap (to save some wear and tear on the flash memory).

-- 
Ext4 data loss
https://bugs.launchpad.net/bugs/317781
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Status in “ecryptfs-utils” source package in Ubuntu: Invalid
Status in “linux” source package in Ubuntu: Fix Released
Status in ecryptfs-utils in Ubuntu Jaunty: Invalid
Status in linux in Ubuntu Jaunty: Fix Released

Bug description:
I recently installed Kubuntu Jaunty on a new drive, using Ext4 for all my data.

The first time i had this problem was a few days ago when after a power loss ktimetracker's config file was replaced by a 0 byte version . No idea if anything else was affected.. I just noticed ktimetracker right away.

Today, I was experimenting with some BIOS settings that made the system crash right after loading the desktop. After a clean reboot pretty much any file written to by any application (during the previous boot) was 0 bytes.
For example Plasma and some of the KDE core config files were reset. Also some of my MySQL databases were killed...

My EXT4 partitions all use the default settings with no performance tweaks. Barriers on, extents on, ordered data mode..

I used Ext3 for 2 years and I never had any problems after power losses or system crashes.

Jaunty has all the recent updates except for the kernel that i don't upgrade because of bug #315006

ProblemType: Bug
Architecture: amd64
DistroRelease: Ubuntu 9.04
NonfreeKernelModules: nvidia
Package: linux-image-2.6.28-4-generic 2.6.28-4.6
ProcCmdLine: root=UUID=81942248-db70-46ef-97df-836006aad399 ro rootfstype=ext4 vga=791 all_generic_ide elevator=anticipatory
ProcEnviron:
 LANGUAGE=
 LANG=en_US.UTF-8
 SHELL=/bin/bash
ProcVersionSignature: Ubuntu 2.6.28-4.6-generic
SourcePackage: linux