Hello, In the same spirit than my yesterday report[1], the following test fail on btrfs when it works on tmpfs. $ RUN_VERY_EXPENSIVE_TESTS=yes ./tests/du/2g.sh creating a 2GB file: 100% complete--- exp 2015-05-14 14:03:36.124772165 +0200+++ out 2015-05-14 14:03:36.123772158 +0200@@ -1 +1 @@-~2M+1572864        big You can find the full output of the test suite here [2]. Regards, [1] http://debbugs.gnu.org/cgi/bugreport.cgi?bug=20570[2] http://pastebin.com/akytxtts -- Sébastien "Seblu" Luttringer https://seblu.net | Twitter: @seblu42 GPG: 0x2072D77A