ext4 partition free space wrongly reported by df -h (ubuntu 14.04 64bit)

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http://www.linuxquestions.org – Been pulling my hairs off for two days now... Here's the story: Something is eating up space on my SSD ext4 / partition. du and various disk analyzers are not showing any big directories/files, but it already happened 2 times that there's no space left on disk and then system becomes unstable, I even experienced some 0-truncated files which I had to restore from backup. The difference in reported free space between du and df is huge: like 130 GB on 160 GB disk which is filled only with about 12 GB... It's not the story of root-reserved partition space, already played with it and it's ok. It' (HowTos)