I have sloved this. I'm use centos gnome.
this error due to centos gnome will auto mount /dev/loop0p2 on /root/media, and during the cleanup phase of the diskimagebuild would not unmount /dev/loop0p2. so I turn off auto mount of the centos gnome. https://access.redhat.com/solutions/20107 . it build success finally.
environment: centos7.9 with gnome, logical server.
I install nodepool.nodepool use DIB build ubuntu focal image in logical server.I had extend disk by run lvextend.
traces:
2022-04-13 08:42:55.630 | INFO diskimage_builder.block_device.level3.mount [-] Called for [mount_mkfs_root]
2022-04-13 08:42:55.630 | INFO diskimage_builder.block_device.utils [-] Calling [sudo sync]
2022-04-13 08:42:55.943 | INFO diskimage_builder.block_device.utils [-] Calling [sudo fstrim --verbose /var/cache/nodepool/dib_tmp/dib_build.3DMuQbbI/mnt/]
2022-04-13 08:42:56.119 | DEBUG diskimage_builder.block_device.utils [-] exec_sudo: /var/cache/nodepool/dib_tmp/dib_build.3DMuQbbI/mnt/: 1.7 GiB (1854722048 bytes) trimmed exec_sudo /usr/lib/python3.6/site-packages/diskimage_builder/block_device/utils.py:135
2022-04-13 08:42:56.123 | INFO diskimage_builder.block_device.utils [-] Calling [sudo umount /var/cache/nodepool/dib_tmp/dib_build.3DMuQbbI/mnt/]
2022-04-13 08:42:56.675 | INFO diskimage_builder.block_device.utils [-] Calling [sudo kpartx -d /dev/loop0]
2022-04-13 08:42:56.715 | DEBUG diskimage_builder.block_device.utils [-] exec_sudo: device-mapper: remove ioctl on loop0p2 failed: Device or resource busy exec_sudo /usr/lib/python3.6/site-packages/diskimage_builder/block_device/utils.py:135
2022-04-13 08:42:56.799 | Traceback (most recent call last):
2022-04-13 08:42:56.799 | File "/usr/lib/python3.6/site-packages/diskimage_builder/lib/dib-block-device.py", line 7, in <module>
2022-04-13 08:42:56.799 | sys.exit(main())
2022-04-13 08:42:56.799 | File "/usr/lib/python3.6/site-packages/diskimage_builder/block_device/cmd.py", line 120, in main
2022-04-13 08:42:56.799 | return bdc.main()
2022-04-13 08:42:56.799 | File "/usr/lib/python3.6/site-packages/diskimage_builder/block_device/cmd.py", line 115, in main
2022-04-13 08:42:56.799 | self.args.func()
2022-04-13 08:42:56.799 | File "/usr/lib/python3.6/site-packages/diskimage_builder/block_device/cmd.py", line 39, in cmd_umount
2022-04-13 08:42:56.799 | self.bd.cmd_umount()
2022-04-13 08:42:56.799 | File "/usr/lib/python3.6/site-packages/diskimage_builder/block_device/blockdevice.py", line 442, in cmd_umount
2022-04-13 08:42:56.799 | node.umount()
2022-04-13 08:42:56.799 | File "/usr/lib/python3.6/site-packages/diskimage_builder/block_device/level1/partition.py", line 88, in umount
2022-04-13 08:42:56.799 | self.partitioning.umount()
2022-04-13 08:42:56.799 | File "/usr/lib/python3.6/site-packages/diskimage_builder/block_device/level1/partitioning.py", line 228, in umount
2022-04-13 08:42:56.799 | self.state['blockdev'][self.base]['device']])
2022-04-13 08:42:56.799 | File "/usr/lib/python3.6/site-packages/diskimage_builder/block_device/utils.py", line 143, in exec_sudo
2022-04-13 08:42:56.799 | raise e
2022-04-13 08:42:56.799 | diskimage_builder.block_device.exception.BlockDeviceSetupException: exec_sudo failed
2022-04-13 08:42:56.864 | + diskimage_builder/lib/disk-image-create:main:1 : trap_cleanup
2022-04-13 08:42:56.868 | + diskimage_builder/lib/img-functions:trap_cleanup:36 : exitval=1
2022-04-13 08:42:56.872 | + diskimage_builder/lib/img-functions:trap_cleanup:37 : cleanup
2022-04-13 08:42:56.875 | + diskimage_builder/lib/img-functions:cleanup:42 : unmount_image
2022-04-13 08:42:56.878 | + diskimage_builder/lib/img-functions:unmount_image:22 : sync
2022-04-13 08:42:56.927 | + diskimage_builder/lib/img-functions:unmount_image:26 : unmount_dir /var/cache/nodepool/dib_tmp/dib_build.3DMuQbbI/mnt
2022-04-13 08:42:56.934 | + diskimage_builder/lib/common-functions:unmount_dir:414 : local dir=/var/cache/nodepool/dib_tmp/dib_build.3DMuQbbI/mnt
2022-04-13 08:42:56.940 | + diskimage_builder/lib/common-functions:unmount_dir:415 : local real_dir
2022-04-13 08:42:56.946 | + diskimage_builder/lib/common-functions:unmount_dir:416 : local mnts
2022-04-13 08:42:56.952 | + diskimage_builder/lib/common-functions:unmount_dir:417 : local split_mounts
2022-04-13 08:42:56.958 | + diskimage_builder/lib/common-functions:unmount_dir:418 : local found_mountpoint
2022-04-13 08:42:56.964 | + diskimage_builder/lib/common-functions:unmount_dir:420 : '[' '!' -d /var/cache/nodepool/dib_tmp/dib_build.3DMuQbbI/mnt ']'
2022-04-13 08:42:56.971 | ++ diskimage_builder/lib/common-functions:unmount_dir:427 : readlink -e /var/cache/nodepool/dib_tmp/dib_build.3DMuQbbI/mnt
2022-04-13 08:42:56.979 | + diskimage_builder/lib/common-functions:unmount_dir:427 : real_dir=/var/cache/nodepool/dib_tmp/dib_build.3DMuQbbI/mnt
2022-04-13 08:42:56.984 | + diskimage_builder/lib/common-functions:unmount_dir:430 : IFS='|'
2022-04-13 08:42:56.990 | + diskimage_builder/lib/common-functions:unmount_dir:430 : read -ra split_mounts
2022-04-13 08:42:56.997 | ++ diskimage_builder/lib/common-functions:unmount_dir:435 : sort -r
2022-04-13 08:42:56.997 | ++ diskimage_builder/lib/common-functions:unmount_dir:435 : grep '^/var/cache/nodepool/dib_tmp/dib_build.3DMuQbbI/mnt/'
2022-04-13 08:42:56.997 | ++ diskimage_builder/lib/common-functions:unmount_dir:435 : awk '{print $2}'
2022-04-13 08:42:57.004 | + diskimage_builder/lib/common-functions:unmount_dir:435 : mnts=
2022-04-13 08:42:57.010 | + diskimage_builder/lib/img-functions:unmount_image:27 : '[' -n '' ']'
2022-04-13 08:42:57.015 | + diskimage_builder/lib/img-functions:unmount_image:30 : '[' -n '' ']'
2022-04-13 08:42:57.020 | + diskimage_builder/lib/img-functions:cleanup:43 : /usr/bin/python3 /usr/lib/python3.6/site-packages/diskimage_builder/lib/dib-block-device.py umount
2022-04-13 08:42:57.408 | DEBUG diskimage_builder.block_device.blockdevice [-] Creating BlockDevice object __init__ /usr/lib/python3.6/site-packages/diskimage_builder/block_device/blockdevice.py:229
2022-04-13 08:42:57.408 | DEBUG diskimage_builder.block_device.blockdevice [-] Params [{'config': '/var/cache/nodepool/dib_tmp/dib_build.3DMuQbbI/block-device/config.yaml', 'image-dir': '/var/cache/nodepool/dib_tmp/dib_image.F6YdxoMq', 'root-fs-type': 'ext4', 'root-label': None, 'mount-base': '/var/cache/nodepool/dib_tmp/dib_build.3DMuQbbI/mnt', 'build-dir': '/var/cache/nodepool/dib_tmp/dib_build.3DMuQbbI', 'image-size': '4253184KiB', 'root-fs-opts': '-i 4096 -J size=64 '}] __init__ /usr/lib/python3.6/site-packages/diskimage_builder/block_device/blockdevice.py:232
2022-04-13 08:42:57.409 | INFO diskimage_builder.block_device.level3.mount [-] Called for [mount_mkfs_root]
2022-04-13 08:42:57.409 | INFO diskimage_builder.block_device.utils [-] Calling [sudo sync]
2022-04-13 08:42:57.497 | INFO diskimage_builder.block_device.utils [-] Calling [sudo fstrim --verbose /var/cache/nodepool/dib_tmp/dib_build.3DMuQbbI/mnt/]
2022-04-13 08:42:57.533 | DEBUG diskimage_builder.block_device.utils [-] exec_sudo: fstrim: /var/cache/nodepool/dib_tmp/dib_build.3DMuQbbI/mnt/: the discard operation is not supported exec_sudo /usr/lib/python3.6/site-packages/diskimage_builder/block_device/utils.py:135
2022-04-13 08:42:57.538 | Traceback (most recent call last):
2022-04-13 08:42:57.538 | File "/usr/lib/python3.6/site-packages/diskimage_builder/lib/dib-block-device.py", line 7, in <module>
2022-04-13 08:42:57.538 | sys.exit(main())
2022-04-13 08:42:57.538 | File "/usr/lib/python3.6/site-packages/diskimage_builder/block_device/cmd.py", line 120, in main
2022-04-13 08:42:57.538 | return bdc.main()
2022-04-13 08:42:57.538 | File "/usr/lib/python3.6/site-packages/diskimage_builder/block_device/cmd.py", line 115, in main
2022-04-13 08:42:57.538 | self.args.func()
2022-04-13 08:42:57.538 | File "/usr/lib/python3.6/site-packages/diskimage_builder/block_device/cmd.py", line 39, in cmd_umount
2022-04-13 08:42:57.538 | self.bd.cmd_umount()
2022-04-13 08:42:57.538 | File "/usr/lib/python3.6/site-packages/diskimage_builder/block_device/blockdevice.py", line 442, in cmd_umount
2022-04-13 08:42:57.538 | node.umount()
2022-04-13 08:42:57.538 | File "/usr/lib/python3.6/site-packages/diskimage_builder/block_device/level3/mount.py", line 111, in umount
2022-04-13 08:42:57.538 | self.state['mount'][self.mount_point]['path']])
2022-04-13 08:42:57.538 | File "/usr/lib/python3.6/site-packages/diskimage_builder/block_device/utils.py", line 143, in exec_sudo
2022-04-13 08:42:57.538 | raise e
2022-04-13 08:42:57.538 | diskimage_builder.block_device.exception.BlockDeviceSetupException: exec_sudo failed
Exit code: 1
