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ACL_TYPE_ACCESS

105: 2025-08-23 02:00:04 INFO: Starting Backup of VM 105 (lxc)
105: 2025-08-23 02:00:04 INFO: including mount point rootfs ('/') in backup
105: 2025-08-23 02:00:04 INFO: mode failure - some volumes do not support snapshots
105: 2025-08-23 02:00:04 INFO: trying 'suspend' mode instead
105: 2025-08-23 02:00:04 INFO: backup mode: suspend
105: 2025-08-23 02:00:04 INFO: ionice priority: 7
105: 2025-08-23 02:00:04 INFO: including mount point rootfs ('/') in backup
105: 2025-08-23 02:00:04 INFO: starting first sync /proc/11024/root/ to /var/tmp/vzdumptmp2426606_105
105: 2025-08-23 02:02:46 ERROR: rsync: [generator] set_acl: sys_acl_set_file(var/log/journal, ACL_TYPE_ACCESS): Operation not supported (95)
105: 2025-08-23 02:02:46 ERROR: rsync: [generator] set_acl: sys_acl_set_file(var/log/journal/51366891d25d42e6bd104114dbb32d66, ACL_TYPE_ACCESS): Operation not supported (95)
105: 2025-08-23 02:03:02 ERROR: rsync: [receiver] set_acl: sys_acl_set_file(var/log/journal/51366891d25d42e6bd104114dbb32d66/.system.journal.7isbkI, ACL_TYPE_ACCESS): Operation not supported (95)
105: 2025-08-23 02:03:03 ERROR: rsync: [receiver] set_acl: sys_acl_set_file(var/log/journal/51366891d25d42e6bd104114dbb32d66/.system@5a558993150c4b02aee55b04807aba9d-0000000000000001-0006358a5933c0df.journal.DsIlPa, ACL_TYPE_ACCESS): Operation not supported (95)
105: 2025-08-23 02:03:07 ERROR: rsync: [receiver] set_acl: sys_acl_set_file(var/log/journal/51366891d25d42e6bd104114dbb32d66/.system@5a558993150c4b02aee55b04807aba9d-0000000000000517-0006358a8cea6057.journal.s64WFR, ACL_TYPE_ACCESS): Operation not supported (95)
105: 2025-08-23 02:03:12 ERROR: rsync: [receiver] set_acl: sys_acl_set_file(var/log/journal/51366891d25d42e6bd104114dbb32d66/.system@5a558993150c4b02aee55b04807aba9d-000000000000e3ec-00063629963562cf.journal.P2tXUB, ACL_TYPE_ACCESS): Operation not supported (95)
105: 2025-08-23 02:03:17 ERROR: rsync: [receiver] set_acl: sys_acl_set_file(var/log/journal/51366891d25d42e6bd104114dbb32d66/.system@5a558993150c4b02aee55b04807aba9d-000000000001c02e-000636bc6de8b639.journal.luQ8N9, ACL_TYPE_ACCESS): Operation not supported (95)
105: 2025-08-23 02:03:22 ERROR: rsync: [receiver] set_acl: sys_acl_set_file(var/log/journal/51366891d25d42e6bd104114dbb32d66/.system@5a558993150c4b02aee55b04807aba9d-000000000002a4cd-0006372867798125.journal.HGCR2D, ACL_TYPE_ACCESS): Operation not supported (95)
105: 2025-08-23 02:03:26 ERROR: rsync: [receiver] set_acl: sys_acl_set_file(var/log/journal/51366891d25d42e6bd104114dbb32d66/.system@5a558993150c4b02aee55b04807aba9d-0000000000038273-00063783dff2f025.journal.5bXPBY, ACL_TYPE_ACCESS): Operation not supported (95)
105: 2025-08-23 02:03:31 ERROR: rsync: [receiver] set_acl: sys_acl_set_file(var/log/journal/51366891d25d42e6bd104114dbb32d66/.system@5a558993150c4b02aee55b04807aba9d-0000000000045abb-000637bf8242ed7d.journal.X8Fgoy, ACL_TYPE_ACCESS): Operation not supported (95)
105: 2025-08-23 02:03:36 ERROR: rsync: [receiver] set_acl: sys_acl_set_file(var/log/journal/51366891d25d42e6bd104114dbb32d66/.system@5a558993150c4b02aee55b04807aba9d-000000000005406a-000638254b1a6b32.journal.ouCNVu, ACL_TYPE_ACCESS): Operation not supported (95)
105: 2025-08-23 02:03:40 ERROR: rsync: [receiver] set_acl: sys_acl_set_file(var/log/journal/51366891d25d42e6bd104114dbb32d66/.system@5a558993150c4b02aee55b04807aba9d-0000000000062ebc-000638978c2d5358.journal.aEByKQ, ACL_TYPE_ACCESS): Operation not supported (95)
105: 2025-08-23 02:03:43 ERROR: rsync: [receiver] set_acl: sys_acl_set_file(var/log/journal/51366891d25d42e6bd104114dbb32d66/.system@5a558993150c4b02aee55b04807aba9d-0000000000071a2d-0006392469780eb3.journal.UkXSl1, ACL_TYPE_ACCESS): Operation not supported (95)
105: 2025-08-23 02:03:47 ERROR: rsync: [receiver] set_acl: sys_acl_set_file(var/log/journal/51366891d25d42e6bd104114dbb32d66/.system@5a558993150c4b02aee55b04807aba9d-000000000007fe20-000639be7f3e8a1d.journal.2DMcug, ACL_TYPE_ACCESS): Operation not supported (95)
105: 2025-08-23 02:03:51 ERROR: rsync: [receiver] set_acl: sys_acl_set_file(var/log/journal/51366891d25d42e6bd104114dbb32d66/.system@5a558993150c4b02aee55b04807aba9d-000000000008e313-00063a591da0d380.journal.9iVdLt, ACL_TYPE_ACCESS): Operation not supported (95)
105: 2025-08-23 02:03:55 ERROR: rsync: [receiver] set_acl: sys_acl_set_file(var/log/journal/51366891d25d42e6bd104114dbb32d66/.system@5a558993150c4b02aee55b04807aba9d-000000000009ca9a-00063ae519bff8e5.journal.0q1Oaj, ACL_TYPE_ACCESS): Operation not supported (95)
105: 2025-08-23 02:03:58 ERROR: rsync: [receiver] set_acl: sys_acl_set_file(var/log/journal/51366891d25d42e6bd104114dbb32d66/.system@5a558993150c4b02aee55b04807aba9d-00000000000aa98c-00063b79d6ce6684.journal.VuJ2Ch, ACL_TYPE_ACCESS): Operation not supported (95)
105: 2025-08-23 02:04:02 ERROR: rsync: [receiver] set_acl: sys_acl_set_file(var/log/journal/51366891d25d42e6bd104114dbb32d66/.system@5a558993150c4b02aee55b04807aba9d-00000000000b8e1f-00063c0a2e7a9c8b.journal.fHogFO, ACL_TYPE_ACCESS): Operation not supported (95)
105: 2025-08-23 02:04:04 ERROR: rsync error: some files/attrs were not transferred (see previous errors) (code 23) at main.c(1338) [sender=3.2.7]
105: 2025-08-23 02:04:07 ERROR: Backup of VM 105 failed - command 'rsync --stats -h -X -A --numeric-ids -aH --delete --no-whole-file --sparse --one-file-system --relative '--exclude=/tmp/?*' '--exclude=/var/tmp/?*' '--exclude=/var/run/?*.pid' /proc/11024/root//./ /var/tmp/vzdumptmp2426606_105' failed: exit code 23

vzdump temp dir is /var/temp located on / and / is mounted with noacl flag:

# findmnt -T /var/tmp
TARGET SOURCE           FSTYPE OPTIONS
/      rpool/ROOT/pve-1 zfs    rw,relatime,xattr,noacl,casesensitive

Hmm, it works before. Only PBS was upgraded to 4.0. But backup fails even when backup is performed to local hdd.

Upgrade pve-manager (8.3.0) to (8.4.0)

Update rsync 3.2.7-1+deb12u2 over 3.2.7-1

Workaround:

zfs create nvmpool/vzdump-tmp
zfs set acltype=posixacl nvmpool/vzdump-tmp
/etc/vzdump.conf
tmpdir: /nvmpool/vzdump-tmp