** Changed in: linux (Ubuntu)
       Status: Triaged => Fix Committed

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  [Regression] EXT4-fs error (device sda1):
  ext4_validate_inode_bitmap:99: comm stress-ng: Corrupt inode bitmap

Status in linux package in Ubuntu:
  Fix Committed
Status in linux source package in Bionic:
  Fix Committed

Bug description:
  We're seeing a very reproducible regression in the bionic kernel triggered by 
the stress-ng chdir test performed by the Ubuntu certification suite. We see 
this on both the HiSilicon D05 arm64 server and the HiSilicon D06 arm64 server. 
We have been unable to reproduce on other servers so far.

  [Test Case]
  $ sudo apt-add-repository -y ppa:hardware-certification/public
  $ sudo apt install -y canonical-certification-server
  $ sudo mkfs.ext4 /dev/sda1 (Obviously, this should not be your root disk!!)
  $ sudo /usr/lib/plainbox-provider-checkbox/bin/disk_stress_ng sda --base-time 
240 --really-run

  This test runs a series of stress-ng tests against /dev/sda, and fails
  on the "chdir" test. To speed up reproduction, reduce the test list to
  just "chdir" in the disk_stress_ng script. Attempts to reproduce this
  directly with stress-ng have failed - presumably because of other
  environment setup that this script performs (e.g. setting aio-max-nr
  to 524288).

  Our reproduction test is to use a non-root disk because it can lead to
  corruption, and mkfs.ext4'ing the partition just before running the
  test, to get to a pristine fs state.

  I bisected this down to the following commit:

  commit 555bc9b1421f10d94a1192c7eea4a59faca3e711
  Author: Theodore Ts'o <ty...@mit.edu>
  Date:   Mon Feb 19 14:16:47 2018 -0500

      ext4: don't update checksum of new initialized bitmaps

      BugLink: http://bugs.launchpad.net/bugs/1773233

      commit 044e6e3d74a3d7103a0c8a9305dfd94d64000660 upstream.

  Reverting that fixes the problem. Meanwhile, a proposed fix has been posted 

  [Regression Risk]

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