Hi, It is observed that ext4 is corrupted easily by running some workloads on QEMU NVMe, such as: 1) mkfs.ext4 /dev/nvme0n1 2) mount /dev/nvme0n1 /mnt 3) cd /mnt; git clone git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 4) then the following error message may show up: [ 1642.271816] EXT4-fs error (device nvme0n1): ext4_mb_generate_buddy:747: group 0, block bitmap and bg descriptor inconsistent: 32768 vs 23513 free clusters Or fsck.ext4 will complain after running 'umount /mnt' The issue disappears by reverting 6e02318eaea53eaafe6 ("nvme: add support for the Write Zeroes command"). QEMU version: QEMU emulator version 2.10.2(qemu-2.10.2-1.fc27) Copyright (c) 2003-2017 Fabrice Bellard and the QEMU Project developers Thanks, Ming