FYI, we noticed the following commit: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master commit 657ed1aa4898c8304500e0d13f240d5a67e8be5f ("Btrfs: fix for incorrect directory entries after fsync log replay") in testcase: xfstests with following parameters: disk=4HDD/fs=btrfs/test=generic-quick2 on test machine: snb-drag: threads Sandy Bridge with 6G memory caused below changes: [ 61.736765] BTRFS warning (device dm-0): block group 29360128 has wrong amount of free space [ 61.746562] BTRFS warning (device dm-0): failed to load free space cache for block group 29360128, rebuilding it now To reproduce: git clone git://git.kernel.org/pub/scm/linux/kernel/git/wfg/lkp-tests.git cd lkp-tests bin/lkp install job.yaml # job file is attached in this email bin/lkp run job.yaml Thanks, Xiaolong