The commit 8844618d8aa7 ("ext4: only look at the bg_flags field if it is valid") introduced an issue which are seeing when running "adb remount" on Android devices with the affected kernels. This change appears on 4.4.y and later. > EXT4-fs error (device vdd): ext4_has_uninit_itable:2882: comm remount svc 50: Inode table for bg 0 marked as needing zeroing > Kernel panic - not syncing: EXT4-fs (device vdd): panic forced after error Looks like this fix was already picked up for 4.14.y, 4.17.y but (AFAIK) it isn't on anybody's radar for 4.4 and 4.9. Thanks!