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[Jian Hui Lee <2031326@xxxxxxxxxxxxxxxxxx>]

issue is seen on mtk jammy 5.15 kernel. 
'overlay: support idmapped layers' was supported since v5.18: https://lore.kernel.org/all/20220407112157.1775081-1-brauner@xxxxxxxxxx/
the failure is expected.

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https://bugs.launchpad.net/bugs/2031326

Title:
  ovl-idmapped-mount.sh in ubuntu_overlayfs_smoke_test failed with
  `mount: /root/ovl: wrong fs type, bad option, bad superblock on
  overlay, missing codepage or h elper program, or other error.`

Status in ubuntu-kernel-tests:
  New

Bug description:
  The ovl-idmapped-mount.sh test fails on some kernels. So far, this is
  seen on jammy/linux.

  21:55:19 INFO | 	START	ubuntu_overlayfs_smoke_test.ovl-idmapped-mount.sh	ubuntu_overlayfs_smoke_test.ovl-idmapped-mount.sh	timestamp=1691790919	timeout=300	localtime=Aug 11 21:55:19	
  21:55:19 DEBUG| Persistent state client._record_indent now set to 2
  21:55:19 DEBUG| Persistent state client.unexpected_reboot now set to ('ubuntu_overlayfs_smoke_test.ovl-idmapped-mount.sh', 'ubuntu_overlayfs_smoke_test.ovl-idmapped-mount.sh')
  21:55:19 DEBUG| Waiting for pid 3335 for 300 seconds
  21:55:19 WARNI| System python is too old, crash handling disabled
  21:55:19 DEBUG| Running 'sudo -iu ubuntu /home/ubuntu/autotest/client/tmp/ubuntu_overlayfs_smoke_test/src/overlay-shiftfs-tests/tests/ovl-idmapped-mount.sh'
  21:55:27 DEBUG| [stdout] Creating idmap-test
  21:55:43 DEBUG| [stdout] 
  [snip]
  Starting idmap-test
  21:55:44 ERROR| [stderr] + mkdir work upper lower ovl
  21:55:44 ERROR| [stderr] + mount -t overlay overlay -o lowerdir=lower,upperdir=upper,workdir=work ovl
  21:55:44 ERROR| [stderr] mount: /root/ovl: wrong fs type, bad option, bad superblock on overlay, missing codepage or helper program, or other error.
  21:55:44 DEBUG| [stdout] 
  [snip]
  21:55:57 DEBUG| FAIL
  21:55:57 DEBUG| stderr:
  21:55:57 DEBUG| + mkdir work upper lower ovl
  21:55:57 DEBUG| + mount -t overlay overlay -o lowerdir=lower,upperdir=upper,workdir=work ovl
  21:55:57 DEBUG| mount: /root/ovl: wrong fs type, bad option, bad superblock on overlay, missing codepage or helper program, or other error.
  21:55:57 INFO | 		ERROR	ubuntu_overlayfs_smoke_test.ovl-idmapped-mount.sh	ubuntu_overlayfs_smoke_test.ovl-idmapped-mount.sh	timestamp=1691790957	localtime=Aug 11 21:55:57	Command <sudo -iu ubuntu /home/ubuntu/autotest/client/tmp/ubuntu_overlayfs_smoke_test/src/overlay-shiftfs-tests/tests/ovl-idmapped-mount.sh> failed, rc=1, Command returned non-zero

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