[LU-15400] sanity-lfsck defect: global MDT_DEVNAME can not be used after stop()

• Type: Bug
• Resolution: Fixed
• Priority: Minor
• Fix Version/s: Lustre 2.15.0
• Affects Version/s: Lustre 2.15.0

Epic/Theme

patch

• Severity: 3
• Assignee: Elena Gryaznova
• Reporter: Elena Gryaznova

Description

Global MDT_DEVNAME set at the start of sanity-lfsck equal to a device-mapper device can not be used after stop() because of a device-mapper device is removed and facet device is restored:

      stop () ->
         elif dm_flakey_supported $facet; then
            if [[ -n ${!failover_host} && ${!failover_host} != ${!host} ]]
               dm_cleanup_dev $facet ->
                  unexport_dm_dev $facet

The tests: 1a, 1b, 1c, 2a, 2b, 2c, 2d, 4, 5, 7a, 7b, 8, 30 fail on failover setup with:

        losetup: /dev/mapper/mds1_flakey: failed to set up loop device

This defect is introduced by:
54b9e3f ("LU-684 tests: replace dev_read_only patch with dm-flakey")