I have heard of some data losses with ext4, while it was developed. It will take another year, till this file system is really stable.
The data loses with at splashdot and co, where cause by delayed allocation after a crash. There are test cases at launchpad like this.
1. edit a.new
2. mv a.new a
3. turn off the computer while it is running
=> file a is a 0 byte file



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