/tce directory is stored on HDD's /sda1 partition ext4 formatted. System is booting from USB stick. There is 2GB RAM, an Intel Core2 dual core CPU. No tricks, it's an ordinary rc2, no extension loaded to RAM. From one boot to another same happenes, it is not random. First loaded extensions work as expected, failing ones are at the end of onboot list. There are not too many extensions, thes setup is used to compile simple extensions. If you need I can provide the onboot list. It happened with intltool.tcz first but it's not significant I'm sure. Changing onboot to ondemand it works fine.