[Bisect] ext4_validate_inode_bitmap:98: comm stress-ng: Corrupt inode bitmap

[dann frazier <dann.frazier@canonical.com>]

Hi,
  We're seeing a regression triggered by the stress-ng[*] "chdir" test
that I've bisected to:

044e6e3d74a3 ext4: don't update checksum of new initialized bitmaps

So far we've only seen failures on servers based on HiSilicon's family
of ARM64 SoCs (D05/Hi1616 SoC, D06/Hi1620 SoC). On these systems it is
very reproducible.

= Test Case =
#!/bin/sh
umount /tmp/mnt || /bin/true
mkdir -p /tmp/mnt
mkfs.ext4 -F /dev/sda1
mount /dev/sda1 /tmp/mnt
# Running directly under /tmp/mnt doesn't trigger the issue, we need
# this subdirectory for some reason
dir="/tmp/mnt/tmp/disk_stress_ng_f70f0f26-b332-4c48-9e07-67c529770e3d"
mkdir -p "$dir"
stress-ng --aggressive --verify --timeout 240 --temp-path "$dir" \
	  --chdir 0 --hdd-opts dsync --readahead-bytes 16M -k

= Result =
[70586.263840] EXT4-fs (sda1): mounted filesystem with ordered data mode. Opts: (null)
[70586.637085] EXT4-fs error (device sda1): ext4_validate_inode_bitmap:98: comm stress-ng: Corrupt inode bitmap - block_group = 43936, inode_bitmap = 1439694864
[70602.296551] EXT4-fs error (device sda1): ext4_validate_inode_bitmap:98: comm stress-ng: Corrupt inode bitmap - block_group = 48896, inode_bitmap = 1602224144
[70602.409291] EXT4-fs error (device sda1): ext4_validate_inode_bitmap:98: comm stress-ng: Corrupt inode bitmap - block_group = 48928, inode_bitmap = 1603272720

Full dmesg:
  http://people.canonical.com/~dannf/d05-stress-ng/d05-sas-chdir-4.18.0-rc3+.dmesg

[*] http://kernel.ubuntu.com/~cking/stress-ng/